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Nissan Qashqai J11. Manual - part 269

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

—

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