Qashqai J11. Engine control system (MR20DD)

ECM-50

< SYSTEM DESCRIPTION >

[MR20DD]

SYSTEM

ECO MODE SYSTEM : System Description

INFOID:0000000010702829

System Diagram

CONTROL

ECM receives an ECO mode signal from TCM via CAN communication and improves the fuel economy by
controlling the throttle movement to less than usual.
NOTE:
For the details of the ECO mode, refer to

DMS-6, "ECO MODE CONTROL : System Description"

SYSTEM DISPLAY FUNCTION

ECO Mode Indicator Lamp

When the ECM receives ECO mode signal from TCM, ECM transmits an ECO mode indicator lamp signal to
the combination meter via CAN communication, and the combination meter illuminates ECO mode indicator
located in itself.

ECO DRIVE NAVIGATOR

ECM transmits an ECO drive navigator signal calculated from the accelerator pedal position and the vehicle
speed to the combination meter via CAN communication.
When the acceleration guide is selected in ECO meter display switching function, the suitable accelerator
position for fuel economy will be displayed. For display, refer to .

DMS-6, "ECO MODE CONTROL : System

Description"

INTEGRATED CONTROL OF ENGINE, CVT, AND ABS

INTEGRATED CONTROL OF ENGINE, CVT, AND ABS : System Description

INFOID:0000000010702830

Real time communications (signal exchange) among control units (e.g. ECM, CVT, ABS, and combination
meter) via CAN communication optimizes engine torque and lock-up during gear shift and prevents engine
speed from decreasing during deceleration.

EVAPORATIVE EMISSION SYSTEM

JSBIA5010GB

SYSTEM

ECM-51

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

EVAPORATIVE EMISSION SYSTEM : System Description

INFOID:0000000010702831

System Diagram

System Description

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel-
system.
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases. EVAP canister purge volume control solenoid valve also
shuts off the vapor purge line during decelerating and idling.

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM

POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM : System De-
scription

INFOID:0000000010702832

DESCRIPTION

ECM transmits a target power generation voltage signal received from IPDM E/R to the generator via LIN
communication.

JSBIA0322GB

PBIB3039E

ECM-52

< SYSTEM DESCRIPTION >

[MR20DD]

SYSTEM

The generator includes a self-diagnosis function and transmits a diagnosis signal to ECM via LIN communica-
tion when detecting a malfunction. When ECM receives a diagnosis signal, ECM detects DTC and transmits a
charge warning lamp request signal to the combination meter to turn ON the charge warning lamp.

INFORMATION DISPLAY (COMBINATION METER)

INFORMATION DISPLAY (COMBINATION METER) : ASCD Indicator

INFOID:0000000010702833

ASCD INDICATOR

For detail of ASCD function, refer to

ECM-48, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System

Description"

INFORMATION DISPLAY (COMBINATION METER) : Engine Oil Pressure Warining

INFOID:0000000010702834

DESIGN/PURPOSE

When engine oil pressure is low, the engine oil pressure warning lamp informs the driver of low oil pressure to
prevent damage to the engine.

BULB CHECK

The bulb turns ON after turning ON the ignition switch (engine stop) and turns OFF after restarting the engine.

OPERATION AT COMBINATION METER CAN COMMUNICATION CUT-OFF OR UNUSUAL SIG-
NAL

For the operation for CAN communications blackout or abnormal signal reception, refer to

ECM-87, "Fail-

safe"

Symbol

Message

-- Km/h

JSCIA0831ZZ

Symbol

Message

Low Oil Pressure
Stop Vehicle

JPNIA1881ZZ

SYSTEM

ECM-53

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

SYSTEM DIAGRAM

SIGNAL PATH

• ECM reads the resistance value of an engine oil pressure sensor and transmits the engine oil pressure

warning signal to combination meter via CAN communication.

• The information display (on combination meter) is SHOWN/HIDDEN the engine oil pressure warning,

according to the engine oil pressure sensor signal received from ECM.

LIGHTING CONDITION

When all of the following conditions are satisfied:

• Ignition switch: ON
• Engine running
• Engine oil pressure is less than the specified value.

SHUTOFF CONDITION

• Ignition switch: OFF
• Engine stop
• Engine oil pressure is the specified value or more.

TIMING CHART

CAN COMMUNICATION

CAN COMMUNICATION : System Description

INFOID:0000000010702837

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Refer to

LAN-15, "CAN COMMUNICATION SYSTEM : System Description"

, about CAN communication for

detail.

JSBIA3494GB

JSBIA3700GB

: 100 ms

ECM-54

< SYSTEM DESCRIPTION >

[MR20DD]

OPERATION

OPERATION

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

AUTOMATIC SPEED CONTROL DEVICE (ASCD) : Switch Name and Function

INFOID:0000000010702838

SWITCHES AND INDICATORS

SET SPEED RANGE

ASCD system can be set the following vehicle speed.

SWITCH OPERATION

Refer to

ECM-48, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"

for ASCD operat-

ing instructions.

On the combination meter

On the steering wheel

ASCD indicator

CANCEL switch

RES / + switch
(RESUME/ACCELERATE)

SET / - switch
(SET/COAST)

MAIN switch

JSBIA4588ZZ

Minimum speed (Approx.)

Maximum speed (Approx.)

40 km/h (25 MPH)

144 km/h (89 MPH) (except for Europe)
177 km/h (109 MPH) (for Europe CVT models)
186 km/h (115 MPH) (for Europe M/T models)

Item

Function

CANCEL switch

Cancels the cruise control driving.

ACCEL/RES switch

• Resumes the set speed.
• Increases speed incrementally during cruise control driving.

COAST/SET switch

• Sets desired cruise speed.
• Decreases speed incrementally during cruise control driving.

MAIN switch

Master switch to activate the ASCD system.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ECM-55

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Diagnosis Description

INFOID:0000000010702839

This system is an on board diagnostic system that records exhaust emission-related diagnostic information
and detects a sensors/actuator-related malfunction. A malfunction is indicated by the malfunction indicator
lamp (MIL) and stored in ECU memory as a DTC. The diagnostic information can be obtained with the diag-
nostic tool (GST: Generic Scan Tool).

GST (Generic Scan Tool)

INFOID:0000000010702840

When GST is connected with a data link connector equipped on the vehicle side, it will communicate with the
control unit equipped in the vehicle and then enable various kinds of diagnostic tests. Refer to

GI-49, "CON-

SULT Function and System Application*1"

NOTE:
Service $0A is not applied for regions where it is not mandated.

ECM-56

< SYSTEM DESCRIPTION >

[MR20DD]

DIAGNOSIS SYSTEM (ECM)

DIAGNOSIS SYSTEM (ECM)

DIAGNOSIS DESCRIPTION

DIAGNOSIS DESCRIPTION : 1st Trip Detection Logic and Two Trip Detection Logic

INFOID:0000000010702841

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not illuminate at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL illuminates. The MIL illuminates at the same time when the DTC is stored.
<2nd trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is per-
formed during vehicle operation. Specific on board diagnostic items will cause the ECM to illuminate or blink
the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.

: Applicable

—: Not applicable

DIAGNOSIS DESCRIPTION : DTC and Freeze Frame Data

INFOID:0000000010702842

DTC AND 1ST TRIP DTC

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not recur, the 1st trip DTC
will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is saved in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are saved in the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consec-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the
1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
For malfunctions in which 1st trip DTCs are displayed, refer to

ECM-93, "DTC Index"

. These items are

required by legal regulations to continuously monitor the system/component. In addition, the items monitored
non-continuously are also displayed on CONSULT.
1st trip DTC is specified in Service $07 of SAE J1979/ISO 15031-5. 1st trip DTC detection occurs without illu-
minating the MIL and therefore does not warn the driver of a malfunction.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in Work Flow procedure Step 2, refer to

ECM-120, "Work Flow"

. Then perform DTC Confir-

mation Procedure or Component Function Check to try to duplicate the malfunction. If the malfunction is dupli-
cated, the item requires repair.

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-
perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base
fuel schedule and intake air temperature at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT screen.

Items

MIL

DTC

1st trip DTC

1st trip

2nd trip

1st trip

displaying

2nd trip

displaying

1st trip

displaying

2nd trip

display-

ing

Blinking

Illuminat-

Blinking

Illuminat-

Misfire (Possible three way catalyst
damage) — DTC: P0300 – P0304
is being detected

—

Misfire (Possible three way catalyst
damage) — DTC: P0300 – P0304
is being detected

—

One trip detection diagnoses (Re-
fer to

ECM-93, "DTC Index"

—

Except above

—

DIAGNOSIS SYSTEM (ECM)

ECM-57

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was saved in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st
trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze
frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the
ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem-
ory is erased.

DIAGNOSIS DESCRIPTION : Counter System

INFOID:0000000010702843

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

• When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are

stored in the ECM memory.

• When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are

stored in the ECM memory, and the MIL will come on.

• The MIL will turn OFF after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is

counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs
while counting, the counter will reset.

• The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) with-

out the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injec-
tion System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern
C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS” mode of CON-
SULT will count the number of times the vehicle is driven.

• The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

COUNTER SYSTEM CHART

For details about patterns B and C under “Fuel Injection System” and “Misfire”, see “EXPLANATION FOR
DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYS-
TEM”.
For details about patterns A and B under Other, see “EXPLANATION FOR DRIVING PATTERNS FOR “MIS-
FIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”.
• *1: Clear timing is at the moment OK is detected.
• *2: Clear timing is when the same malfunction is detected in the 2nd trip.

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for “Misfire <Exhaust Quality De-
terioration>”, “Fuel Injection System”

Priority

Items

Freeze frame data

Misfire — DTC: P0300 – P0304
Fuel Injection System Function — DTC: P0171, P0172

Except the above items

1st trip freeze frame data

Items

Fuel Injection System

Misfire

Other

MIL (turns OFF)

3 (pattern B)

DTC, Freeze Frame Data (no display)

80 (pattern C)

40 (pattern A)

1st Trip DTC (clear)

1 (pattern C), *1

1 (pattern B)

1st Trip Freeze Frame Data (clear)

*1, *2

1 (pattern B)

ECM-58

< SYSTEM DESCRIPTION >

[MR20DD]

DIAGNOSIS SYSTEM (ECM)

Explanation for Driving Patterns for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”

Driving Pattern B

Refer to

ECM-60, "DIAGNOSIS DESCRIPTION : Driving Pattern"

*1: When the same malfunction is de-

tected in two consecutive trips, MIL
will light up.

*2: MIL will turn OFF after vehicle is driv-

en 3 times (pattern B) without any
malfunctions.

*3: When the same malfunction is de-

tected in two consecutive trips, the
DTC and the freeze frame data will be
stored in ECM.

*4: The DTC and the freeze frame data

will not be displayed any longer after
vehicle is driven 80 times (pattern C)
without the same malfunction. (The
DTC and the freeze frame data still
remain in ECM.)

*5: When a malfunction is detected for

the first time, the 1st trip DTC and the
1st trip freeze frame data will be
stored in ECM.

*6: The 1st trip DTC and the 1st trip

freeze frame data will be cleared at
the moment OK is detected.

*7: When the same malfunction is de-

tected in the 2nd trip, the 1st trip
freeze frame data will be cleared.

*8: 1st trip DTC will be cleared when ve-

hicle is driven once (pattern C) with-
out the same malfunction after DTC
is stored in ECM.

JMBIA1417GB

DIAGNOSIS SYSTEM (ECM)

ECM-59

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Driving Pattern C

Refer to

ECM-60, "DIAGNOSIS DESCRIPTION : Driving Pattern"

Example:
If the stored freeze frame data is as per the following:
Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80

C (176

To be satisfied with driving pattern C, the vehicle should run under the following conditions:
Engine speed: 475 – 1,225 rpm, Calculated load value: 27 – 33%, Engine coolant temperature: more than
70

C (158

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns Except For “Misfire <Exhaust
Quality Deterioration>”, “Fuel Injection System”

JMBIA1418GB

ECM-60

< SYSTEM DESCRIPTION >

[MR20DD]

DIAGNOSIS SYSTEM (ECM)

Explanation for Driving Patterns Except for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection
System”

Driving Pattern A

Refer to

ECM-60, "DIAGNOSIS DESCRIPTION : Driving Pattern"

Driving Pattern B

Refer to

ECM-60, "DIAGNOSIS DESCRIPTION : Driving Pattern"

DIAGNOSIS DESCRIPTION : Driving Pattern

INFOID:0000000010702844

CAUTION:

Always drive at a safe speed.

DRIVING PATTERN A

Driving pattern A means a trip satisfying the following conditions.
• Engine speed reaches 400 rpm or more.
• Engine coolant temperature rises by 20

C (36

F) or more after starting the engine.

• Engine coolant temperature reaches 70

C (158

F) or more.

• The ignition switch is turned from ON to OFF.
NOTE:
• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern A.

DRIVING PATTERN B

Driving pattern B means a trip satisfying the following conditions.
• Engine speed reaches 400 rpm or more.
• Engine coolant temperature reaches 70

C (158

F) or more.

• Vehicle speed of 70 – 120 km/h (44 – 75 MPH) is maintained for 60 seconds or more under the control of

closed loop.

• Vehicle speed of 30 – 60 km/h (19 – 37 MPH) is maintained for 10 seconds or more under the control of

closed loop.

• Under the closed loop control condition, the following state reaches 12 seconds or more in total: Vehicle

speed of 4 km/h (2 MPH) or less with idling condition.

• The state of driving at 10 km/h (7 MPH) or more reaches 10 minutes or more in total.
• A lapse of 22 minutes or more after engine start.
NOTE:
• Drive the vehicle at a constant velocity.
• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern B.

DRIVING PATTERN C

Driving pattern C means operating vehicle as per the following:
The following conditions should be satisfied at the same time:
Engine speed: (Engine speed in the freeze frame data)

375 rpm

*1: When the same malfunction is de-

tected in two consecutive trips, MIL
will light up.

*2: MIL will turn OFF after vehicle is driv-

en 3 times (pattern B) without any
malfunctions.

*3: When the same malfunction is de-

tected in two consecutive trips, the
DTC and the freeze frame data will be
stored in ECM.

*4: The DTC and the freeze frame data

will not be displayed any longer after
vehicle is driven 40 times (pattern A)
without the same malfunction.
(The DTC and the freeze frame data
still remain in ECM.)

*5: When a malfunction is detected for

the first time, the 1st trip DTC and the
1st trip freeze frame data will be
stored in ECM.

*6: 1st trip DTC will be cleared after vehi-

cle is driven once (pattern B) without
the same malfunction.

*7: When the same malfunction is de-

tected in the 2nd trip, the 1st trip
freeze frame data will be cleared.

DIAGNOSIS SYSTEM (ECM)

ECM-61

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Calculated load value: (Calculated load value in the freeze frame data) x (1

0.1) [%]

Engine coolant temperature condition:
• When the freeze frame data shows lower than 70

C (158

F), engine coolant temperature should be lower

than 70

C (158

F).

• When the freeze frame data shows higher than or equal to 70

C (158

F), engine coolant temperature should

be higher than or equal to 70

C (158

F).

NOTE:
• When the same malfunction is detected regardless of the above vehicle conditions, reset the counter of driv-

ing pattern C.

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern C.

• The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC is

stored in ECM.

DRIVING PATTERN D

Driving pattern D means a trip satisfying the following conditions.
• The state of driving at 40 km/h (25 MPH) reaches 300 seconds or more in total.
• Idle speed lasts 30 seconds or more.
• A lapse of 600 seconds or more after engine start.
NOTE:
• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern D.

DIAGNOSIS DESCRIPTION : System Readiness Test (SRT) Code

INFOID:0000000010702845

System Readiness Test (SRT) code is specified in Service $01 of SAE J1979/ISO 15031-5.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use
the information in this Service Manual to set the SRT to “CMPLT”.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's
normal driving pattern; the SRT will indicate “INCMP” for these items.
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM mem-
ory power supply is interrupted for several hours.
If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the
vehicle is returned to the customer untested.
NOTE:
If MIL is ON during the state emissions inspection, the vehicle is also returned to the customer untested even
though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and
DTC (No DTCs) before the inspection.

SRT SET TIMING

SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is
done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and
is shown in the table below.

ECM-62

< SYSTEM DESCRIPTION >

[MR20DD]

DIAGNOSIS SYSTEM (ECM)

OK: Self-diagnosis is carried out and the result is OK.

NG: Self-diagnosis is carried out and the result is NG.

—: Self-diagnosis is not carried out.

When all SRT related self-diagnoses show OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will
indicate “CMPLT”.

→

Case 1 above

When all SRT related self-diagnoses show OK results through several different cycles, the SRT will indicate
“CMPLT” at the time the respective self-diagnoses have at least one OK result.

→

Case 2 above

If one or more SRT related self-diagnoses show NG results in 2 consecutive cycles, the SRT will also indicate
“CMPLT”.

→

Case 3 above

The table above shows that the minimum number of cycles for setting SRT as “INCMP” is the number one (1)
for each self-diagnosis (Case 1 & 2) or the number two (2) for one of self-diagnoses (Case 3). However, in
preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice
(Case 3) for the following reasons:
• The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
• The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
• During SRT driving pattern, the 1st trip DTC (NG) is detected prior to “CMPLT” of SRT and the self-diagnosis

memory must be erased from the ECM after repair.

• If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.

NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out
prior to the state emission inspection even though the SRT indicates “CMPLT”.

DIAGNOSIS DESCRIPTION : Malfunction Indicator Lamp (MIL)

INFOID:0000000010702846

When emission-related ECU detects a malfunction in the emission
control systems components and/or the powertrain control compo-
nents (which affect vehicle emissions), it turns on/blinks MIL to
inform the driver that a malfunction has been detected.
1.

The MIL illuminates when ignition switch is turned ON (engine is
not running).
NOTE:
Check the MIL circuit if MIL does not illuminate. Refer to

ECM-

400, "Diagnosis Procedure"

When the engine is started, the MIL should go off.
NOTE:

Self-diagnosis result

Example

Diagnosis

Ignition cycle

←

→

OFF

←

→

OFF

←

→

OFF

←

→

All OK

Case 1

P0400

OK (1)

— (1)

OK (2)

— (2)

P0402

OK (1)

— (1)

OK (2)

P1402

OK (1)

OK (2)

— (2)

SRT of EGR

“CMPLT”

Case 2

P0400

OK (1)

— (1)

P0402

— (0)

OK (1)

— (1)

P1402

OK (1)

OK (2)

— (2)

SRT of EGR

“INCMP”

“CMPLT”

NG exists

Case 3

P0400

—

P0402

—

P1402

—

(Consecutive

NG)

(1st trip)

DTC

1st trip DTC

—

1st trip DTC

DTC

(= MIL ON)

SRT of EGR

“INCMP”

“CMPLT”

SAT652J

DIAGNOSIS SYSTEM (ECM)

ECM-63

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

If MIL continues to illuminate/blink, perform self-diagnoses and inspect/repair accordingly because an
emission-related ECU has detected a malfunction in the emission control systems components and/or the
powertrain control components (which affect vehicle emissions).

On Board Diagnosis Function

INFOID:0000000010702847

ON BOARD DIAGNOSIS ITEM

The on board diagnostic system has the following functions.

BULB CHECK MODE

Description

This function allows damage inspection in the MIL bulb (blown, open circuit, etc.).

Operation Procedure

Turn ignition switch ON.

The MIL on the instrument panel should stay ON.
If it remains OFF, check MIL circuit. Refer to

ECM-400, "Diagnosis Procedure"

MALFUNCTION WARNING MODE

Description

In this function ECM turns on or blinks MIL when it detects a malfunction in the emission control system com-
ponents and/or the powertrain control components (which affect vehicle emissions) to inform the driver that a
malfunction has been detected.

Operation Procedure

Turn ignition switch ON.

Check that MIL illuminates.
If it remains OFF, check MIL circuit. Refer to

ECM-400, "Diagnosis Procedure"

Start engine and let it idle.
• For two trip detection logic diagnoses, ECM turns on MIL when it detects the same malfunction twice

inthe two consecutive driving cycles. (2 trip detection logic diagnoses)

• For 1st trip detection logic diagnoses, ECM turns on MIL when it detects a malfunction in one driving

cycle.

• ECM blinks MIL when it detects a malfunction that may damage the three way catalyst (misfire).

SELF-DIAGNOSTIC RESULTS MODE

Description

This function allows to indicate DTCs or 1st trip DTCs stored in ECM according to the number of times MIL is
blinking.

How to Set Self-diagnostic Results Mode

NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a mal-

function.

Diagnostic test mode

Function

Bulb check

MIL can be checked.

Malfunction warning

If ECM detects a malfunction, it illuminates or blinks MIL to inform the driver that a malfunction has
been detected.

Self-diagnostic results

DTCs or 1st trip DTCs stored in ECM can be read.

Accelerator pedal released posi-
tion learning

ECM can learn the accelerator pedal released position. Refer to

ECM-127, "Description"

Throttle valve closed position
learning

ECM can learn the throttle valve closed position. Refer to

ECM-128, "Description"

Idle air volume learning

ECM can learn the idle air volume. Refer to

ECM-129, "Description"

Mixture ratio self-learning value
clear

Erase the air-fuel ratio learning value. Refer to

ECM-131, "Description"

ECM-64

< SYSTEM DESCRIPTION >

[MR20DD]

DIAGNOSIS SYSTEM (ECM)

• After ignition switch is turned off, ECM always returns to the diagnostic test mode I.

Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.

Repeat the following procedure quickly five times within 5 seconds.
• Fully depress the accelerator pedal.
• Fully release the accelerator pedal.

Wait 7 seconds, fully depress the accelerator pedal and keep it depressed for approx. 10 seconds until the
MIL starts blinking.

Fully depress the accelerator pedal.
ECM has entered to the diagnostic test mode II (Self-diagnostic results).

How to Read Self-diagnostic Results

The DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below. Judgment of
DTCs or 1st trip DTCs is impossible by the number of blinks only. If the MIL does not illuminate in diagnostic
test mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the
MIL illuminates in the diagnostic test mode II (Self-diagnostic results), it is a DTC; if two or more codes are dis-
played, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified
codes can be identified by using the CONSULT or GST. A DTC will be used as an example for how to read a
code.

DTCs can be identified by the number of four-digit numeral flashes per the following.

PBIB0092E

PBIB3005E

DIAGNOSIS SYSTEM (ECM)

ECM-65

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-sec-
onds) - OFF (0.6-seconds) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-seconds ON and 0.3-seconds OFF cycle.
A change from upper digit numeral to lower one occurs at an interval of 1.0-second OFF. For example, the
10th-digit numeral flashes 1.3 seconds (0.3+1.0seconds) after hide of the 100th-digit numeral.
A change from one DTC to another occurs at an interval of 1.8-seconds OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. Refer to

ECM-93, "DTC Index"

How to Erase Self-diagnostic Results

By performing this procedure, ECM memory is erased and the following diagnostic information is erased as
well.
• DTC (Diagnostic trouble codes)
• 1st trip DTC
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values
NOTE:
Also, if a battery terminal is disconnected, ECM memory is erased and the diagnostic information as listed
above is erased. (The amount of time required for erasing may vary from a few seconds to several hours.)

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Set ECM in the diagnostic test mode II (Self-diagnostic results).

The diagnostic information has been erased from the backup memory in the ECM.
Fully depress the accelerator pedal and keep it depressed for more than 10 seconds.

Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

CONSULT Function

INFOID:0000000010702848

FUNCTION

*: The following emission-related diagnostic information is cleared when the ECM memory is erased.

• DTC (Diagnostic trouble codes)

• 1st trip diagnostic trouble codes

• Freeze frame data

• 1st trip freeze frame data

• System readiness test (SRT) codes

• Test values

SELF DIAGNOSTIC RESULT MODE

Number

Flashes

Diagnostic test mode

Function

Self Diagnostic Result

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data

can be read and erased quickly.

Data Monitor

Input/Output data in the ECM can be read.

Work Support

This mode enables a technician to adjust some devices faster and more accurately by following the in-
dications on the CONSULT unit.

Active Test

Diagnostic Test Mode in which CONSULT drives some actuators apart from the ECMs and also shifts
some parameters in a specified range.

ECU Identification

ECM part number can be read.

DTC Work Support

SRT and operating condition to check DTC can be confirmed.

Qashqai J11. Engine control system (MR20DD) - part 4