Nissan Pathfinder (2009 year). Manual - part 357

EC-870

< COMPONENT DIAGNOSIS >

[VK56DE]

FUEL PUMP

4.

Check voltage between ECM terminal 113 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

3.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

Check voltage between IPDM E/R terminal 46 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 9.

4.

DETECT MALFUNCTIONING PART

Check harness for open or short between IPDM E/R and ECM.

>> Repair harness or connectors.

5.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Disconnect 15 A fuse (No. 48).

3.

Check 15 A fuse.

OK or NG

OK

>> GO TO 6.

NG

>> Replace fuse.

6.

CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.

3.

Disconnect IPDM E/R harness connector E119.

4.

Check harness continuity between IPDM E/R terminal 13 and
“fuel level sensor unit and fuel pump” terminal 1, “fuel level sen-
sor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram. 

5.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E41, C1
• Harness for open or short between fuel pump and IPDM E/R

Voltage: Battery voltage 

PBIB1187E

Voltage: Battery voltage

PBIB2656E

Continuity should exist.

BBIA0545E

2009 Pathfinder

FUEL PUMP

EC-871

< COMPONENT DIAGNOSIS >

[VK56DE]

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• Harness for open or short between fuel pump and ground

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

8.

CHECK FUEL PUMP

Refer to 

EC-871, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace “fuel level sensor unit and fuel pump”.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-49, "Intermittent Incident"

.

OK or NG

OK

>> Replace IPDM E/R.

NG

>> Repair or replace harness or connectors.

Component Inspection

INFOID:0000000003936856

FUEL PUMP

1.

Disconnect “fuel level sensor unit and fuel pump” harness connector.

2.

Check resistance between fuel level sensor unit and fuel pump
terminals 1 and 3.

Resistance: 0.2 - 5.0 

Ω

 [at 25

°

C (77

°

F)]

SEC918C

2009 Pathfinder

EC-872

< COMPONENT DIAGNOSIS >

[VK56DE]

IGNITION SIGNAL

IGNITION SIGNAL

Component Description

INFOID:0000000003936857

IGNITION COIL & POWER TRANSISTOR

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.

Diagnosis Procedure

INFOID:0000000003936858

1.

CHECK ENGINE START

Turn ignition switch OFF, and restart engine.
Is engine running?

Yes or No

Yes (With CONSULT-III)>>GO TO 2.
Yes (Without CONSULT-III)>>GO TO 3.
No

>> GO TO 4.

2.

CHECK OVERALL FUNCTION

 With CONSULT-III

1.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.

2.

Check that each circuit produces a momentary engine speed drop.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

3.

CHECK OVERALL FUNCTION

 Without CONSULT-III

1.

Let engine idle.

2.

Read the voltage signal between ECM terminals 46, 60, 61, 62,
65, 79, 80, 81 and ground with an oscilloscope.

3.

Check that the oscilloscope screen shows the signal wave as
shown below.
NOTE:
The pulse cycle changes depending on rpm at idle.

1.

Ignition coils (with power transistor) 
(bank 2)

2.

Ignition coils (with power transistor) 
(bank 1)

: Vehicle front

ALBIA0370ZZ

PBIB2094E

PBIB0044E

2009 Pathfinder

IGNITION SIGNAL

EC-873

< COMPONENT DIAGNOSIS >

[VK56DE]

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OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

4.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF, wait at least 10 seconds and then turn it ON.

2.

Check voltage between ECM terminals 119, 120 and ground
with CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> Go to 

EC-565, "Diagnosis Procedure"

.

5.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect condenser-1 harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between condenser-1 terminal 1 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 6.

6.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector E119.

3.

Check harness continuity between IPDM E/R terminal 3 and condenser-1 terminal 1.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> Go to 

EC-565, "Diagnosis Procedure"

.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

Voltage: Battery voltage

MBIB0034E

BBIA0358E

Voltage: Battery voltage

PBIB0624E

Continuity should exist.

2009 Pathfinder

EC-874

< COMPONENT DIAGNOSIS >

[VK56DE]

IGNITION SIGNAL

• Harness connectors E2, F32
• IPDM E/R harness connector E119
• Harness for open or short between condenser-1 and IPDM E/R

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

8.

CHECK CONDENSER-1 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check harness continuity between condenser-1 terminal 2 and ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 9.

NG

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

9.

CHECK CONDENSER-1

Refer to 

EC-875, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace condenser-1.

10.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Disconnect ignition coil harness connector.

4.

Turn ignition switch ON.

5.

Check voltage between ignition coil terminal 3 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

Continuity should exist.

1.

Ignition coils (with power transistor) 
(bank 2)

2.

Ignition coils (with power transistor) 
(bank 1)

: Vehicle front

Voltage: Battery voltage

ALBIA0370ZZ

PBIB0138E

2009 Pathfinder

IGNITION SIGNAL

EC-875

< COMPONENT DIAGNOSIS >

[VK56DE]

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• Harness connectors E2, F32
• Harness for open or short between ignition coil and harness connector F32

>> Repair or replace harness or connectors.

12.

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check harness continuity between ignition coil terminal 2 and ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 13.

NG

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

13.

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminals 46, 60, 61, 62, 65, 79, 80, 81 and ignition coil terminal
1.
Refer to Wiring Diagram.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 14.

NG

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

14.

CHECK IGNITION COIL WITH POWER TRANSISTOR

Refer to 

EC-875, "Component Inspection"

.

 OK or NG

OK

>> GO TO 15.

NG

>> Replace malfunctioning ignition coil with power transistor.

15.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-49, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000003936859

IGNITION COIL WITH POWER TRANSISTOR

CAUTION:

Perform the following procedure in a place with no combustible objects and good ventilation.
1.

Turn ignition switch OFF.

2.

Disconnect ignition coil harness connector.

3.

Check resistance between ignition coil terminals as per the fol-
lowing.

4.

If NG, replace ignition coil with power transistor.
If OK, go to next step.

Continuity should exist.

Continuity should exist.

Terminal No. (Polarity)

Resistance [at 25

°

C (77

°

F)]

1 and 2

Except 0 or 

∞

 

Ω

1 and 3

Except 0 

Ω

2 and 3

PBIB0847E

2009 Pathfinder

EC-876

< COMPONENT DIAGNOSIS >

[VK56DE]

IGNITION SIGNAL

5.

Turn ignition switch OFF.

6.

Reconnect all harness connectors disconnected.

7.

Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pres-
sure.
NOTE:
Do not use CONSULT-III to release fuel pressure, or fuel pres-
sure applies again during the following procedure.

8.

Start engine.

9.

After engine stalls, crank it 2 or 3 times to release all fuel pres-
sure.

10. Turn ignition switch OFF.
11. Remove all ignition coil harness connectors to avoid the electri-

cal discharge from the ignition coils.

12. Remove ignition coil and spark plug of the cylinder to be

checked.

13. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.
15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm

between the edge of the spark plug and grounded metal portion
as shown in the figure.

16. Crank engine for approximately 3 seconds, and check whether

spark is generated between the spark plug and the grounded
metal portion.

CAUTION:

• Never place the spark plug and the ignition coil within 50

cm each other. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20 kV or more.

• It might damage the ignition coil if the gap of more than 17 mm is made.
NOTE:
When the gap is less than 13 mm, a spark might be generated even if the coil is malfunctioning.

17. If NG, replace ignition coil with power transistor.

CONDENSER-1

1.

Turn ignition switch OFF.

2.

Disconnect condenser-1 harness connector.

3.

Check resistance between condenser-1 terminals 1 and 2.

Spark should be generated.

ALBIA0351ZZ

PBIB2325E

Resistance

Above 1 M

Ω

 at 25

°

C (77

°

F)

PBIB0794E

2009 Pathfinder

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-877

< COMPONENT DIAGNOSIS >

[VK56DE]

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ON BOARD REFUELING VAPOR RECOVERY (ORVR)

System Description

INFOID:0000000003936860

From the beginning of refueling, the air and vapor inside the fuel tank go through refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.

WARNING:

When conducting inspections below, always observe the following:
• Put a “CAUTION: FLAMMABLE” sign in workshop.
• Never smoke while servicing fuel system. Keep open flames and sparks away from work area.
• Always furnish the workshop with a CO

2 

fire extinguisher.

CAUTION:

• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosion-proof container and put lid on securely.
- Release fuel pressure from fuel line. Refer to 

EC-951, "Fuel Pressure Check"

.

- Disconnect battery ground cable.
• Always replace O-ring when the fuel gauge retainer is removed.
• Never kink or twist hose and tube when they are installed.
• Never tighten hose and clamps excessively to avoid damaging hoses.
• After installation, run engine and check for fuel leakage at connection.
• Never attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.

Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.

Diagnosis Procedure

INFOID:0000000003936861

SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG.

1.

CHECK EVAP CANISTER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

2.

Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.0 kg (4.4 lb).

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

JMBIA1930GB

2009 Pathfinder