Content .. 344 345 346 347 ..

Nissan Pathfinder (2008 year). Manual - part 346

ECM

EC-885

< ECU DIAGNOSIS >

[VK56DE]

ECU DIAGNOSIS

ECM

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001538013

Remarks:

●

Specification data are reference values.

●

Specification data are output/input values which are detected or supplied by the ECM at the connector.

* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show the specification data in spite of the

ignition timing not being adjusted to the specification data. This IGN TIMING monitors the data calculated by the ECM according to the signals
input from the camshaft position sensor and other ignition timing related sensors.

MONITOR ITEM

CONDITION

SPECIFICATION

ENG SPEED

• Run engine and compare CONSULT-III value with the tachometer indica-

tion.

Almost the same speed as the
tachometer indication.

MAS A/F SE-B1

See

EC-554

B/FUEL SCHDL

See

EC-554

A/F ALPHA-B1
A/F ALPHA-B2

See

EC-554

COOLAN TEMP/S

• Engine: After warming up

More than 70

C (158

A/F SEN1 (B1)
A/F SEN1 (B2)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 2.2 V

HO2S2 (B1)
HO2S2 (B2)

• Revving engine from idle to 3,000 rpm quickly after the following conditions

are met.

• After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and

at idle for 1 minute under no load

0 - 0.3V

←→

Approx. 0.6 - 1.0V

HO2S2 MNTR (B1)
HO2S2 MNTR (B2)

• Revving engine from idle to 3,000 rpm quickly after the following conditions

are met.

- Engine: After warming up
- Keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at

idle for 1 minute under no load

LEAN

←→

RICH

VHCL SPEED SE

• Turn drive wheels and compare CONSULT-III value with the speedometer

indication.

Almost the same speed as the
speedometer indication

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.65 - 1.87V

Accelerator pedal: Fully depressed

More than 4.3V

ACCEL SEN 2*

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.56 - 0.96V

Accelerator pedal: Fully depressed

More than 4.0V

TP SEN 1-B1
TP SEN 2-B1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8V

START SIGNAL

• Ignition switch: ON

→

START

→

OFF

→

OFF

CLSD THL POS

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

Accelerator pedal: Slightly depressed

OFF

AIR COND SIG

• Engine: After warming up, idle the

engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor: Operates.)

P/N POSI SW

• Ignition switch: ON

Shift lever: P or N

Shift lever: Except above

OFF

PW/ST SIGNAL

• Engine: After warming up, idle the

engine

Steering wheel: Not being turned
(Forward direction)

OFF

Steering wheel: Being turned

EC-886

< ECU DIAGNOSIS >

[VK56DE]

ECM

LOAD SIGNAL

• Ignition switch: ON

Rear window defogger switch is ON
and/or lighting switch is in 2nd.

Rear window defogger switch is OFF
and lighting switch is OFF.

OFF

IGNITION SW

• Ignition switch: ON

→

OFF

→

OFF

→

HEATER FAN SW

• Engine: After warming up, idle the

engine

Heater fan control switch: OFF

OFF

Heater fan control switch: ON

BRAKE SW

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

INJ PULSE-B1
INJ PULSE-B2

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Idle

2.0 - 2.8 msec

2,000 rpm

1.9 - 2.9 msec

IGN TIMING

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Idle

- 20

BTDC

2,000 rpm

- 45

BTDC

CAL/LD VALUE

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Idle

14% - 33%

2,500 rpm

12% - 25%

MASS AIRFLOW

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Idle

3.0 - 9.0 g·m/s

2,500 rpm

9.0 - 28.0 g·m/s

PURG VOL C/V

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Idle
(Accelerator pedal: Not depressed
even slightly, after engine starting.)

2,000 rpm

—

INT/V TIM (B1)
INT/V TIM (B2)

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Idle

−

- 5

2,000 rpm

Approx. 0

- 20

INT/V SOL (B1)
INT/V SOL (B2)

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Idle

0% - 2%

2,000 rpm

Approx. 25% - 50%

AIR COND RLY

• Engine: After warming up, idle the

engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor: Operates)

FUEL PUMP RLY

• For 1 second after turning ignition switch ON
• Engine running or cranking

• Except above conditions

OFF

VENT CONT/V

• Ignition switch: ON

OFF

THRTL RELAY

• Ignition switch: ON

COOLING FAN

• Engine: After warming up, idle the

engine

• Air conditioner switch: OFF

Engine coolant temperature: 97

(207

F) or less

OFF

Engine coolant temperature: Between
98

C (208

F) and 100

C (212

LOW

Engine coolant temperature: 101

(214

F) or more

MONITOR ITEM

CONDITION

SPECIFICATION

ECM

EC-887

< ECU DIAGNOSIS >

[VK56DE]

*: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ from
ECM terminals voltage signal.

*3: Before measuring the terminal voltage, confirm the battery is fully charged. Refer to

PG-4, "How to Handle Battery"

HO2S2 HTR (B1)
HO2S2 HTR (B2)

• Engine speed is below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and

at idle for 1 minute under no load

• Engine speed: Above 3,600 rpm

OFF

I/P PULLY SPD

• Vehicle speed: More than 20 km/h (12 MPH)

Almost the same speed as the
tachometer indication

VEHICLE SPEED

• Turn drive wheels and compare CONSULT-III value with the speedometer

indication.

Almost the same speed as the
speedometer indication

TRVL AFTER MIL

• Ignition switch: ON

Vehicle has traveled after MIL has
turned ON.

0 - 65,535 km
(0 - 40,723 mile)

A/F S1 HTR (B1)
A/F S1 HTR (B2)

• Engine: After warming up, idle the engine

4 - 100%

AC PRESS SEN

• Engine: Idle
• Both A/C switch and blower fan switch: ON (Compressor operates.)

1.0 - 4.0V

VHCL SPEED SE

• Turn drive wheels and compare CONSULT-III value with the speedometer

indication.

Almost the same speed as the
speedometer indication

SET VHCL SPD

• Engine: Running

ASCD: Operating.

The preset vehicle speed is dis-
played.

MAIN SW

• Ignition switch: ON

MAIN switch: Pressed

MAIN switch: Released

OFF

CANCEL SW

• Ignition switch: ON

CANCEL switch: Pressed

CANCEL switch: Released

OFF

RESUME/ACC SW

• Ignition switch: ON

RESUME/ACCELERATE switch:
Pressed

RESUME/ACCELERATE switch: Re-
leased

OFF

SET SW

• Ignition switch: ON

SET/COAST switch: Pressed

SET/COAST switch: Released

OFF

BRAKE SW1

• Ignition switch: ON

Brake pedal: Fully released

Brake pedal: Slightly depressed

OFF

BRAKE SW2

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

CRUISE LAMP

• Ignition switch: ON

MAIN switch: Pressed at the 1st time

→

at the 2nd time

→

OFF

SET LAMP

• MAIN switch: ON
• Vehicle speed: Between 40 km/h

(25 MPH) and 144 km/h (89
MPH)

ASCD: Operating

ASCD: Not operating

OFF

ALT DUTY

• Engine: Idle

0 - 80%

BAT CUR SEN

• Engine speed: Idle

• Battery: Fully charged*

• Selector lever: P or N
• Air conditioner switch: OFF
• No load

Approx. 2,600 - 3,500mV

ALT DUTY SIG

• Power generation voltage variable control: Operating

• Power generation voltage variable control: Not operating

OFF

MONITOR ITEM

CONDITION

SPECIFICATION

EC-888

< ECU DIAGNOSIS >

[VK56DE]

ECM

ECM Harness Connector Terminal Layout

INFOID:0000000001538014

ECM Terminal and Reference Value

INFOID:0000000001538015

PREPARATION

ECM is located in the engine room passenger side behind battery.

ECM INSPECTION TABLE

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECMs transistor. Use a ground other than ECM terminals, such as the ground.

PBIB3368E

BBIA0386E

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

ECM ground

[Engine is running]
• Idle speed

Body ground

A/F sensor 1 heater (bank 1)

[Engine is running]
• Warm-up condition
• Idle speed

(More than 140 seconds after starting en-
gine)

Approximately 2.9 - 8.8V

Throttle control motor relay
power supply

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

L/W

Throttle control motor (Close)

[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D
• Accelerator pedal: Fully released

0 - 14V

PBIA8148J

PBIB1104E

ECM

EC-889

< ECU DIAGNOSIS >

[VK56DE]

L/B

Throttle control motor (Open)

[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D
• Accelerator pedal: Fully depressed

0 - 14V

Heated oxygen sensor 2 heat-
er (bank 1)

[Engine is running]
• Engine speed: Below 3,600 rpm after the

following conditions are met.

- Engine: After warming up
- Keeping the engine speed between 3,500

and 4,000 rpm for 1 minute and at idle for 1
minute under no load

0 - 1.0V

[Ignition switch: ON]
• Engine: Stopped
[Engine is running]
• Engine speed: Above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

Intake valve timing control so-
lenoid valve (bank 1)

[Engine is running]
• Warm-up condition
• Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]
• Warm-up condition
• Engine speed: 2,000rpm

7 - 12V

Intake valve timing control so-
lenoid valve (bank 2)

[Engine is running]
• Warm-up condition
• Idle speed

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]
• Warm-up condition
• Engine speed: 2,000rpm

7 - 12V

Power steering pressure sen-
sor

[Engine is running]
• Steering wheel: Being turned

0.5 - 4.5V

[Engine is running]
• Steering wheel: Not being turned

0.4 - 0.8V

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB1105E

PBIB1790E

EC-890

< ECU DIAGNOSIS >

[VK56DE]

ECM

Crankshaft position sensor
(POS)

[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle

Approximately 10V

[Engine is running]
• Engine speed: 2,000 rpm

Approximately 10V

Camshaft position sensor
(PHASE)

[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle

1.0 - 4.0V

[Engine is running]
• Engine speed: 2,000 rpm

1.0 - 4.0V

Knock sensor (bank 1)

[Engine is running]
• Idle speed

Approximately 2.5V

A/F sensor 1 (bank 2)

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

Approximately 1.8V
Output voltage varies with air fuel
ratio.

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB1041E

PBIB1042E

PBIB1039E

PBIB1040E

ECM

EC-891

< ECU DIAGNOSIS >

[VK56DE]

21
22
23
44

L
V
G
L

Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 7

[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

24
43

G
G

A/F sensor 1 heater (bank 2)

[Engine is running]
• Warm-up condition
• Idle speed

(More than 140 seconds after starting en-
gine)

Approximately 2.9 - 8.8V

Heated oxygen sensor 2 heat-
er (bank 2)

[Engine is running]
• Engine speed: Below 3,600 rpm after the

following conditions are met.

- Engine: After warming up
- Keeping the engine speed between 3,500

and 4,000 rpm for 1 minute and at idle for 1
minute under no load

0 - 1.0V

[Ignition switch: ON]
• Engine: Stopped
[Engine is running]
• Engine speed: Above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

EVAP control system pres-
sure sensor

[Ignition switch: ON]

Approximately 1.8 - 4.8V

Intake air temperature sensor

[Engine is running]

Approximately 0 - 4.8V
Output voltage varies with intake
air temperature.

A/F sensor 1 (bank 1)

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

Approximately 1.8V
Output voltage varies with air fuel
ratio.

Knock sensor (bank 2)

[Engine is running]
• Idle speed

Approximately 2.5V

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

SEC984C

SEC985C

PBIA8148J

EC-892

< ECU DIAGNOSIS >

[VK56DE]

ECM

40
41
42
63

V
R
O
W

Fuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2
Fuel injector No. 8

[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

EVAP canister purge volume
control solenoid valve

[Engine is running]
• Idle speed
• Accelerator pedal: Not depressed even

slightly, after engine starting

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]
• Engine speed: About 2,000 rpm (More than

100 seconds after starting engine)

BATTERY VOLTAGE

(11 - 14V)

46
60
61
62

LG
V
L
Y

Ignition signal No. 7
Ignition signal No. 5
Ignition signal No. 3
Ignition signal No. 1

[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle

0 - 0.3V

[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm

0.1 - 0.6V

Sensor power supply
(Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

TER-

MI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

SEC984C

SEC985C

SEC990C

SEC991C

SEC986C

SEC987C

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