Nissan Frontier. Manual - part 373

DIAGNOSIS SYSTEM (ECM)

EC-63

< SYSTEM DESCRIPTION >

[QR25DE]

VHCL SPD CUT
[NON/CUT]

• Indicates the vehicle cruise condition.

NON: Vehicle speed is maintained at the
ASCD set speed.
CUT: Vehicle speed increased to exces-
sively high compared with the ASCD set
speed, and ASCD operation is cut off.

LO SPEED CUT
[NON/CUT]

• Indicates the vehicle cruise condition.

NON: Vehicle speed is maintained at the
ASCD set speed.
CUT: Vehicle speed decreased to exces-
sively low compared with the ASCD set
speed, and ASCD operation is cut off.

AT OD MONITOR
[ON/OFF]

• Indicates [ON/OFF] condition of A/T O/D

according to the input signal from the
TCM.

• For M/T models always “OFF” is dis-

played.

AT OD CANCEL
[ON/OFF]

• Indicates [ON/OFF] condition of A/T O/D

cancel signal sent from the TCM.

• For M/T models always “OFF” is dis-

played.

CRUISE LAMP
[ON/OFF]

• Indicates [ON/OFF] condition of CRUISE

lamp determined by the ECM according
to the input signals.

SET LAMP
[ON/OFF]

• Indicates [ON/OFF] condition of SET

lamp determined by the ECM according
to the input signals.

ALT DUTY [%]

• Indicates the duty ratio of the power gen-

eration command value. The ratio is cal-
culated by ECM based on the battery
current sensor signal.

BAT CUR SEN [mV]

• The signal voltage of battery current sen-

sor is displayed.

A/F ADJ-B1

• Indicates the correction factor stored in

ECM.
The factor is calculated from the differ-
ence between the target air-fuel ratio
stored in ECM and the air-fuel ratio cal-
culated form A/F sensor 1 signal.

P/N POSI SW
[ON/OFF]

• Indicates [ON/OFF] condition from the

park/neutral position (PNP) signal.

INT/A TEMP SE
[

°C] or [°F]

• The intake air temperature (determined

by the signal voltage of the intake air
temperature sensor) is indicated.

AC PRESS SEN [V]

• The signal voltage from the refrigerant

pressure sensor is displayed.

THRTL STK CNT B1

A/F SEN1 DIAG1(B1)
[INCMP/CMPLT]

• Indicates DTC P015A or P015B self-di-

agnosis condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

A/F SEN1 DIAG2(B1)
[INCMP/CMPLT]

• Indicates DTC P014C or P014D self-di-

agnosis condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

Monitored item [Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

EC-64

< SYSTEM DESCRIPTION >

[QR25DE]

DIAGNOSIS SYSTEM (ECM)

*: This item is indicated, but not used.

NOTE:

Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

WORK SUPPORT MODE

Work Item

A/F SEN1 DIAG3(B1)
[ABSNT/PRSNT]

• Indicates DTC P014C, P014D, P015A or

P015B self-diagnosis condition.

- ABSNT: The vehicle condition is not with-

in the diagnosis range.

- PRSNT: The vehicle condition is within

the diagnosis range.

HO2 S2 DIAG2 (B1)
[INCMP/CMPLT]

• Indicates DTC P0139 self-diagnosis

(slow response) condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

HO2 S2 DIAG1 (B1)
[INCMP/CMPLT]

• Indicates DTC P0139 self-diagnosis (de-

layed response) condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

SYSTEM 1 DIAGNO-
SIS A B1
[INCMP/CMPLT]

• Indicates DTC P117A self-diagnosis con-

dition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

SYSTEM 1 DIAGNO-
SIS B B1
[ABSNT/PRSNT]

• Indicates DTC P117A self-diagnosis con-

dition.

- ABSNT: Self-diagnosis standby
- PRSNT: Under self-diagnosis

Monitored item [Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

WORK ITEM

CONDITION

USAGE

IDLE AIR VOL LEARN

• The idle air volume that keeps the engine within the spec-

ified range is memorized In ECM.

When learning the idle air volume

EVAP SYSTEM CLOSE

Close the EVAP canister vent control valve in order to make
EVAP system close under the following conditions.
• IGN SW ON
• Engine not running
• Ambient temperature is above 0

°C (32°F).

• No vacuum and no high pressure in EVAP system
• Fuel tank temp is more than 0

°C (32°F).

• Within 10 minutes after starting “EVAP SYSTEM CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” under

the condition except above, CONSULT will discontinue it
and display appropriate instruction.
NOTE:
When starting engine, CONSULT may display “BAT-
TERY VOLTAGE IS LOW. CHARGE BATTERY”, even
when using a charged battery.

When detecting EVAP vapor leak
in the EVAP system

FUEL PRESSURE RELEASE

• Fuel pump will stop by touching “START” during idling.

Crank a few times after engine stalls.

When releasing fuel pressure from
fuel line

TARGET IGN TIM ADJ*

• Idle condition

When adjusting target ignition tim-
ing

TARGET IDLE RPM ADJ*

• Idle condition

When setting target idle speed

VIN REGISTRATION

• In the mode, VIN is registered in ECM.

When registering VIN in ECM

SELF-LEARNING CONT

• The coefficient of self-learning control mixture ratio returns

to the original coefficient.

When clearing the coefficient of
self-learning control value

DIAGNOSIS SYSTEM (ECM)

EC-65

< SYSTEM DESCRIPTION >

[QR25DE]

*: This function is not necessary in the usual service procedure.

ACTIVE TEST MODE

Test Item

*: Leaving cooling fan OFF with CONSULT while engine is running may cause the engine to overheat.

CLSD THL POS LEARN

• Ignition on and engine stopped

When learning the throttle valve
closed position.

SAVING DATA FOR REPLC CPU

In this mode, save data that is in ECM.

When ECM is replaced.

WRITING DATA FOR REPLC CPU

In this mode, write data stored by “SAVE DATA FOR
CPUREPLC” in work support mode to ECM.

When ECM is replaced.

WORK ITEM

CONDITION

USAGE

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

FUEL INJEC-
TION

• Engine: Return to the original

trouble condition

• Change the amount of fuel injec-

tion using CONSULT.

If trouble symptom disappears, see
CHECK ITEM.

• Harness and connectors
• Fuel injector
• A/F sensor 1

ENG COOLANT
TEMP

• Engine: Return to the original

trouble condition

• Change the engine coolant tem-

perature using CONSULT.

If trouble symptom disappears, see
CHECK ITEM.

• Harness and connectors
• Engine coolant temperature sen-

sor

• Fuel injector

PURG VOL
CONT/V

• Engine: After warming up, run en-

gine at 1,500 rpm.

• Change the EVAP canister purge

volume control solenoid valve
opening percent using CON-
SULT.

Engine speed changes according to
the opening percent.

• Harness and connectors
• Solenoid valve

FUEL/T TEMP
SEN

• Change the fuel tank temperature using CONSULT.

ALTERNATOR
DUTY

• Engine: Idle
• Change duty ratio using CON-

SULT.

Battery voltage changes.

• Harness and connectors
• IPDM E/R
• Alternator

FUEL PUMP RE-
LAY

• Ignition switch: ON

(Engine stopped)

• Turn the fuel pump relay ON and

OFF using CONSULT and listen
to operating sound.

Fuel pump relay makes the operat-
ing sound.

• Harness and connectors
• Fuel pump relay

IGNITION TIM-
ING

• Engine: Return to the original

trouble condition

• Timing light: Set
• Retard the ignition timing using

CONSULT.

If trouble symptom disappears, see
CHECK ITEM.

• Perform Idle Air Volume Learning.

POWER BAL-
ANCE

• Engine: After warming up, idle the

engine.

• A/C switch OFF
• Shift lever: P or N (A/T), Neutral

(M/T)

• Cut off each injector signal one at

a time using CONSULT.

Engine runs rough or dies.

• Harness and connectors
• Compression
• Fuel injector
• Power transistor
• Spark plug
• Ignition coil

VENT CON-
TROL/V

• Ignition switch: ON (Engine

stopped)

• Turn solenoid valve ON and OFF

with the CONSULT and listen to
operating sound.

Solenoid valve makes an operating
sound.

• Harness and connectors
• Solenoid valve

V/T ASSIGN AN-
GLE

• Engine: Return to the original

trouble condition

• Change intake valve timing using

CONSULT.

If trouble symptom disappears, see
CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

EC-66

< SYSTEM DESCRIPTION >

[QR25DE]

DIAGNOSIS SYSTEM (ECM)

DTC WORK SUPPORT MODE

Test Item

*: DTC P1442 and P1456 does not apply to D40 models but appears in DTC Work Support Mode screens.

SRT & P-DTC MODE

SRT STATUS Mode

• For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT screen; for items whose SRT

codes are not set, “INCMP” is displayed.

• “SRT STARUS” provides the presence or absence of permanent DTCs stored in ECM memory.

PERMANENT DTC STATUS Mode

How to display permanent DTC status

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Turn ignition switch ON.

5. Select “PERMANENT DTC STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT.

NOTE:

Permanent DTCs stored in ECM memory are displayed on the CONSULT screen to show if a driving pat-

tern required for erasing permanent DTCs is complete (CMPLT) or incomplete (INCMP).

CAUTION:

Since the “PERMANENT DTC STATUS” screen displays the previous trip information, repeat the

following twice to update the information: “Ignition switch OFF”, “Wait for more than 10 seconds”

and “Ignition switch ON”.

NOTE:

This mode is not used in regions that permanent DTCs are not regulated by law.

SRT WORK SUPPORT Mode

Test mode

Test item

Corresponding DTC No.

Reference page

A/F SEN1

A/F SEN1(B1) P1276

P0130

EC-197

EVAPORATIVE SYS-
TEM

EVP V/S LEAK P0456/P1456*

P0442

EC-275

P0455

EC-311

P0456

EC-318

PURG FLOW P0441

P0441

EC-270

PURG VOL CN/V P1444

P0443

EC-282

HO2S2

HO2S2 (B1) P1146

P0138

EC-211

HO2S2(B1) P1147

P0137

EC-207

HO2S2(B1) P0139

P0139

EC-217

JSBIA0062GB

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