Nissan Pathfinder (2012 year). Manual - part 293

REFRIGERANT PRESSURE SENSOR

EC-425

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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2. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• Harness for open or short between ECM and refrigerant pressure sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

OK or NG

OK

>> Replace refrigerant pressure sensor. Refer to 

HA-54, "Removal and Installation for Refrigerant

Pressure Sensor"

.

NG

>> Repair or replace. 

Continuity should exist.

August 2012

2012 Pathfinder

EC-426

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

VIAS

VIAS

Diagnosis Procedure

INFOID:0000000007358385

1.

CHECK OVERALL FUNCTION

 

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Perform “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.

3. Turn VIAS control solenoid valve “ON” and “OFF”, and make

sure that power valve actuator rod moves.

 

Without CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Rev engine up to between 2,200 and 3,300 rpm and make sure

that power valve actuator rod moves.

OK or NG

OK

>>

INSPECTION END

NG (With CONSULT) >>GO TO 2.

NG (Without CONSULT) >>GO TO 3.

2.

CHECK VACUUM EXISTENCE

 

With CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator.

2. Start engine and let it idle.

3. Perform “VIAS S/V-1” in “ACTIVE TEST” mode with CONSULT.

4. Turn VIAS control solenoid valve “ON” and “OFF”, and check vacuum existence under the following condi-

tions.

OK or NG

OK

>> Repair or replace power valve actuator. Refer to 

EM-27, "Exploded View"

.

NG 

>> GO TO 4.

3.

CHECK VACUUM EXISTENCE

 

Without CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator.

2. Disconnect VIAS control solenoid valve harness connector.

3. Start engine and let it idle.

BBIA0570E

BBIA0570E

VIAS SOL VALVE

Vacuum

ON

Should exist.

OFF

Should not exist.

August 2012

2012 Pathfinder

VIAS

EC-427

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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4. Apply 12V of direct current between VIAS control solenoid valve

terminals 1 and 2.

5. Check vacuum existence under the following conditions.

OK or NG

OK

>> Repair or replace power valve actuator. Refer to 

EM-27,

"Exploded View"

.

NG

>> GO TO 4.

4.

CHECK VACUUM HOSE

1. Stop engine.

2. Check hoses and tubes between intake manifold and power

valve actuator for cracks, clogging, improper connection or dis-

connection. Refer to 

EC-65, "Vacuum Hose Drawing"

.

OK or NG

OK

>> GO TO 5.

NG

>> Repair hoses or tubes.

5.

CHECK VACUUM TANK

Refer to 

EC-428, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace vacuum tank. Refer to 

EM-27, "Removal and Installation"

.

6.

CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect VIAS control solenoid valve harness connector.

3. Turn ignition switch ON.

4. Check voltage between terminal 1 and ground with CONSULT

or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

Condition

Vacuum

12V direct current supply

Should exist.

No supply

Should not exist.

PBIB0845E

SEF109L

BBIA0569E

Voltage: Battery voltage

PBIB0173E

August 2012

2012 Pathfinder

EC-428

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

VIAS

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between VIAS control solenoid valve and IPDM E/R

• Harness for open or short between VIAS control solenoid valve and ECM

>> Repair harness or connectors.

8.

CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 9.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

9.

CHECK VIAS CONTROL SOLENOID VALVE

Refer to 

EC-428, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace VIAS control solenoid valve. Refer to 

EM-27, "Removal and Installation"

.

10.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358386

VIAS CONTROL SOLENOID VALVE

 With CONSULT

1. Reconnect harness connectors disconnected.
2. Turn ignition switch ON.
3. Perform “VIAS S/V-1” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time under the

following conditions.

Operation takes less than 1 second.

 Without CONSULT

Continuity should exist.

Condition

VIAS SOL VALVE

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

ON

Yes

No

OFF

No

Yes

JMBIA0180ZZ

August 2012

2012 Pathfinder

VIAS

EC-429

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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Check air passage continuity and operation delay time under the fol-

lowing conditions.

Operation takes less than 1 second.

VACUUM TANK

1. Disconnect vacuum hose connected to vacuum tank.

2. Connect a vacuum pump to the port (A) of vacuum tank.

3. Apply vacuum and make sure that vacuum exists at the port (B).

Condition

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

12V direct current supply 
between terminals 1 and 2

Yes

No

No supply

No

Yes

PBIB2532E

PBIB0846E

August 2012

2012 Pathfinder

EC-430

< ECU DIAGNOSIS INFORMATION >

[VQ40DE]

ECM

ECU DIAGNOSIS INFORMATION

ECM

CONSULT Reference Value in Data Monitor Mode

INFOID:0000000007358387

Remarks:

z

 Specification data are reference values.

z

 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 value with the tachometer indication.

Almost the same speed as the 
tachometer indication.

MAS A/F SE-B1

See 

EC-86

.

B/FUEL SCHDL

See 

EC-86

.

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

See 

EC-86

.

COOLAN TEMP/S

• Engine: After warming up

More than 70

°

C (158

°

F)

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

- 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.

0 - 0.3 V 

←→

 Approx. 0.6 - 1.0 

V

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 value with the speedometer in-

dication.

Almost the same speed as the 
speedometer indication

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14 V

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.65 - 0.87 V

Accelerator pedal: Fully depressed

More than 4.3 V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.56 - 0.96 V

Accelerator pedal: Fully depressed

More than 4.0 V

TP SEN 1-B1
TP SEN 2-B1*

1

• Ignition switch: ON

(Engine stopped)

• Shift  lever:  D

Accelerator pedal: Fully released

More than 0.36 V

Accelerator pedal: Fully depressed

Less than 4.75 V

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8 V

START SIGNAL

• Ignition switch: ON 

→

 START 

→

 ON

OFF 

→

 ON 

→

 OFF

CLSD THL POS

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

ON

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.)

ON

P/N POSI SW

• Ignition switch: ON

Shift lever: P or N

ON

Shift lever: Except above

OFF

PW/ST SIGNAL

• Engine: After warming up, idle the 

engine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned.

ON

August 2012

2012 Pathfinder

ECM

EC-431

< ECU DIAGNOSIS INFORMATION >

[VQ40DE]

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LOAD SIGNAL

• Ignition switch: ON

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

ON

Rear window defogger switch is OFF 
and lighting switch is OFF

OFF

IGNITION SW

• Ignition switch: ON 

→

 OFF 

→

 ON

ON 

→

 OFF 

→

 ON

HEATER FAN SW

• Engine: After warming up, idle the 

engine

Heater fan: Operating.

ON

Heater fan: Not operating

OFF

BRAKE SW

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

INJ PULSE-B1
INJ PULSE-B2

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

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

IGN TIMING

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

Idle

13

°

 - 18

°

 BTDC

2,000 rpm

25

°

 - 45

°

 BTDC

CAL/LD VALUE

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

Idle

5% - 35%

2,500 rpm

5% - 35%

MASS AIRFLOW

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

Idle

2.0 - 6.0 g/s

2,500 rpm

7.0 - 20.0 g/s

PURG VOL C/V

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

Idle
(Accelerator pedal is not depressed 
even slightly, after engine starting)

0%

2,000 rpm

—

INT/V TIM (B1)
INT/V TIM (B2)

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

Idle

−

5

°

 - 5

°

CA

2,000 rpm

Approx. 0

°

 - 30

°

CA

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

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

Idle

0% - 2%

2,000 rpm

Approx. 0% - 50%

VIAS S/V-1

• Engine: After warming up

2,200 - 3,300 rpm

ON

Except above conditions

OFF

AIR COND RLY

• Engine: After warming up, idle the 

engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates)

ON

FUEL PUMP RLY

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

ON

• Except above conditions

OFF

VENT CONT/V

• Ignition switch: ON

OFF

THRTL RELAY

• Ignition switch: ON

ON

COOLING FAN

• Engine: After warming up, idle the 

engine

• Air conditioner switch: OFF

Engine coolant temperature: 97

°

C 

(207

°

F) or less

OFF

Engine coolant temperature: Between 
98

°

C (208

°

F) and 104

°

C (219

°

F)

LOW

Engine coolant temperature: 105

°

C 

(221

°

F) or more

HI

MONITOR ITEM

CONDITION

SPECIFICATION

August 2012

2012 Pathfinder

EC-432

< ECU DIAGNOSIS INFORMATION >

[VQ40DE]

ECM

HO2S2 HTR (B1)
HO2S2 HTR (B2)

• 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

ON

• 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 
speedometer indication

VEHICLE SPEED

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

dication.

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 blower fan switch: ON (Compressor operates)

1.0 - 4.0 V

VHCL SPEED SE

• Turn drive wheels and compare speedometer indication with the CONSULT 

value.

Almost the same speed as the 
CONSULT value

SET VHCL SPD

• Engine: Running

ASCD: Operating.

The preset vehicle speed is dis-
played.

MAIN SW

• Ignition switch: ON

MAIN switch: Pressed

ON

MAIN switch: Released

OFF

CANCEL SW

• Ignition switch: ON

CANCEL switch: Pressed

ON

CANCEL switch: Released

OFF

RESUME/ACC SW

• Ignition switch: ON

RESUME/ACCELERATE switch: 
Pressed

ON

RESUME/ACCELERATE switch: Re-
leased

OFF

SET SW

• Ignition switch: ON

SET/COAST switch: Pressed

ON

SET/COAST switch: Released

OFF

BRAKE SW1

• Ignition switch: ON

Brake pedal: Fully released

ON

Brake pedal: Slightly depressed

OFF

BRAKE SW2

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

CRUISE LAMP

• Ignition switch: ON

MAIN switch: pressed at the 1st time 

→

 

at the 2nd time

ON 

→

 OFF

SET LAMP

• MAIN switch: ON
• When vehicle speed is between 

40km/h (25MPH) and 144km/h 
(89MPH)

ASCD: Operating

ON

ASCD: Not operating

OFF

ALT DUTY

• Engine: Idle

0 - 80%

BAT CUR SEN

• Engine speed: Idle
• Battery: Fully charged*

2

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

Approx. 2,600 - 3,500 mV

ALT DUTY SIG

• Power generation voltage variable control: Operating

ON

• Power generation voltage variable control: Not operating

OFF

A/F ADJ-B1

• Engine: Running

−

0.330 - 0.330

A/F ADJ-B2

• Engine: Running

−

0.330 - 0.330

EVAP LEAK DIAG

• Ignition switch: ON

Indicates the condition of EVAP 
leak diagnosis.

MONITOR ITEM

CONDITION

SPECIFICATION

August 2012

2012 Pathfinder