Nissan March K13. Manual - part 222

DIAGNOSIS SYSTEM (ECM)

EC-349

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

The DTC and 1st trip DTC are displayed at the same time. 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 diagnostic test mode II (Self-diagnostic Results), it is a DTC; if two or more codes are displayed,
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-III. A DTC will be used as an example for how to read a code.

A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds
consisting of an ON (0.6-second) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. (See

EC-365, "DTC Index"

The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to “How
to Switch Diagnostic Test Mode” below.
• If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours.
• Be careful not to erase the stored memory before starting trouble diagnoses.

Diagnostic Test Mode II — Heated Oxygen Sensor 1 Monitor

In this mode, the MIL displays the condition of the fuel mixture (lean or rich) which is monitored by the heated
oxygen sensor 1.

*: Maintains conditions just before switching to open loop.

To check the heated oxygen sensor 1 function, start engine in the Diagnostic Test Mode II and warm it up until
engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no load conditions. Then make sure that the
MIL comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no load.
MIL FLASHING WITHOUT DTC
If the ECM is in Diagnostic Test Mode II, MIL may flash when engine is running. In this case, check ECM diag-
nostic test mode. How to switch the diagnostic test (function) modes, and details of the above functions are
described later.
The following emission-related diagnostic information is cleared when the ECM memory is erased.
• Diagnostic trouble codes
• 1st trip diagnostic trouble codes
• Freeze frame data
• 1st trip freeze frame data

PBIA3905E

MIL

Fuel mixture condition in the exhaust gas

Air fuel ratio feedback control condition

Lean

Closed loop system

OFF

Rich

*Remains ON or OFF

Any condition

Open loop system

EC-350

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

DIAGNOSIS SYSTEM (ECM)

How to Switch Diagnostic Test 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 malfunction.

• Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
HOW TO SET DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)

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 for approx. 10 seconds until the MIL starts
blinking.

Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
NOTE:
Wait until the same DTC (or 1st trip DTC) appears to confirm all DTCs certainly.

HOW TO SET DIAGNOSTIC TEST MODE II (HEATED OXYGEN SENSOR 1 MONITOR)
1.

Set the ECM in Diagnostic Test Mode II (Self-diagnostic results).
Refer to “HOW TO SET DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)” above.

Start Engine.
ECM has entered to Diagnostic Test Mode II (Heated oxygen sensor 1 monitor).

HOW TO ERASE DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)
1.

Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to “HOW TO SET DIAGNOSTIC TEST
MODE II (SELF-DIAGNOSTIC RESULTS)” above.

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

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

CONSULT-III Function

INFOID:0000000005886480

FUNCTION

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

• Diagnostic trouble codes

• 1st trip diagnostic trouble codes

PBIB0092E

Diagnostic test mode

Function

Ecu Identification

ECM part number can be read.

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.

Active Test

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

Function Test

This mode is used to inform customers when their vehicle condition requires periodic maintenance.

Work Support

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

DIAGNOSIS SYSTEM (ECM)

EC-351

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

• Freeze frame data

• 1st trip freeze frame data

SELF DIAGNOSTIC RESULT MODE

Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to

EC-365, "DTC Index"

Freeze Frame Data and 1st Trip Freeze Frame Data

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE

Monitored Item

Freeze frame data

item*

Description

DTC RESULT

• The engine control component part/control system has a trouble code, it is displayed as PXXXX. (Refer to

EC-365, "DTC Index"

COOLANT TEMP
[

C] or [

• The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%]

• “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than

short-term fuel trim.

S-FUEL TRM-B1 [%]

• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-

ule.

ENGINE SPEED [rpm]

• The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED
[km/h] or [mph]

• The vehicle speed at the moment a malfunction is detected is displayed.

INT MANI PRES [kPa]

• These items are displayed but are not applicable to this model.

ABSOL TH·P/S [%]

• The throttle valve opening angle at the moment a malfunction is detected is displayed.

B/FUEL SCHDL
[msec]

• The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE
[

C] or [

• The intake air temperature at the moment a malfunction is detected is displayed.

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One mode in the following is displayed.

Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop

COMBUST CONDI-
TION

• These items are displayed but are not applicable to this model.

Monitored item

Unit

Description

Remarks

ENG SPEED

rpm

• Indicates the engine speed computed from the

signal of the crankshaft position sensor (POS)
and camshaft position sensor (PHASE).

• Accuracy becomes poor if engine

speed drops below the idle rpm.

• If the signal is interrupted while the

engine is running, an abnormal value
may be indicated.

B/FUEL SCHDL

msec

• “Base fuel schedule” indicates the fuel injection

pulse width programmed into ECM, prior to any
learned on board correction.

• When engine is running, specification

range is indicated in “SPEC”.

EC-352

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

DIAGNOSIS SYSTEM (ECM)

A/F ALPHA-B1

• The mean value of the air-fuel ratio feedback cor-

rection factor per cycle is indicated.

• When the engine is stopped, a certain

value is indicated.

• When engine is running, specification

range is indicated in “SPEC”.

• This data also includes the data for

the air-fuel ratio learning control.

COOLAN TEMP/S

C or

• The engine coolant temperature (determined by

the signal voltage of the engine coolant tempera-
ture sensor) is displayed.

• When the engine coolant temperature

sensor is open or short-circuited,
ECM enters fail-safe mode. The en-
gine coolant temperature determined
by the ECM is displayed.

HO2S1 (B1)

• The A/F signal computed from the input signal of

the heated oxygen sensor 1 is displayed.

HO2S2 (B1)

• The signal voltage of the heated oxygen sensor 2

is displayed.

HO2S1 MNTR(B1)

RICH/LEAN

• Display of heated oxygen sensor 1 signal during

air-fuel ratio feedback control:
RICH: means the mixture became

″

rich

″

, and

control is being affected toward a leaner mixture.
LEAN: means the mixture became

″

lean

″

, and

control is being affected toward a rich mixture.

• After turning ON the ignition switch,

″

RICH

″

is displayed until air-fuel mix-

ture ratio feedback control begins.

• When the air-fuel ratio feedback is

clamped, the value just before the
clamping is displayed continuously.

HO2S2 MNTR(B1)

RICH/LEAN

• Display of heated oxygen sensor 2 signal:

RICH: means the amount of oxygen after three
way catalyst is relatively small.
LEAN: means the amount of oxygen after three
way catalyst is relatively large.

• When the engine is stopped, a certain

value is indicated.

VHCL SPEED SE

km/h or mph

• The vehicle speed computed from the vehicle

speed signal sent from combination meter is dis-
played.

BATTERY VOLT

• The power supply voltage of ECM is displayed.

ACCEL SEN 1

• The accelerator pedal position sensor signal volt-

age is displayed.

• ACCEL SEN 2 signal is converted by

ECM internally. Thus, it differs from
ECM terminal voltage signal.

ACCEL SEN 2

TP SEN 1-B1

• The throttle position sensor signal voltage is dis-

played.

• TP SEN 2-B1 signal is converted by

ECM internally. Thus, it differs from
ECM terminal voltage signal.

TP SEN 2-B1

START SIGNAL

ON/OFF

• Indicates start signal status [ON/OFF] computed

by the ECM according to the signals of engine
speed and battery voltage.

• After starting the engine, [OFF] is dis-

played regardless of the starter sig-
nal.

CLSD THL POS

ON/OFF

• Indicates idle position [ON/OFF] computed by

ECM according to the accelerator pedal position
sensor signal.

AIR COND SIG

ON/OFF

• Indicates [ON/OFF] condition of the air condition-

er switch as determined by the air conditioner sig-
nal.

PW/ST SIGNAL

ON/OFF

• [ON/OFF] condition of the power steering system

(determined by the signal sent from EPS control
unit) is indicated.

LOAD SIGNAL

ON/OFF

• Indicates [ON/OFF] condition from the electrical

load signal.
ON: Rear window defogger switch is ON and/or
lighting switch is in 2nd position.
OFF: Both rear window defogger switch and light-
ing switch are OFF.

IGNITION SW

ON/OFF

• Indicates [ON/OFF] condition from ignition switch

signal.

HEATER FAN SW

ON/OFF

• Indicates [ON/OFF] condition from the heater fan

switch signal.

Monitored item

Unit

Description

Remarks

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