Infiniti QX56 (Z62). Manual - part 606

 

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Infiniti QX56 (Z62). Manual - part 606

 

 

EC-402

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1217 ENGINE OVER TEMPERATURE

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK ENGINE COOLANT LEAKAGE-II

Check the following for leakage.
• Hose
• Radiator
• Water pump

>> Repair or replace malfunctioning part.

4.

CHECK RESERVOIR TANK CAP

Check reservoir tank cap. Refer to 

CO-11, "RESERVOIR TANK CAP : Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace reservoir tank cap.

5.

CHECK THERMOSTAT

Check thermostat. Refer to 

CO-21, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace thermostat. Refer to 

CO-20, "Removal and Installation"

.

6.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-216, "Component Inspection (Engine Coolant Temperature Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace engine coolant temperature sensor. Refer to 

EM-86, "Exploded View"

.

7.

CHECK MAIN 12 CAUSES

If the cause cannot be isolated, check the 

CO-6, "Troubleshooting Chart"

.

>> INSPECTION END

P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-403

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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P1220 FUEL PUMP CONTROL MODULE (FPCM)

DTC Logic

INFOID:0000000006217912

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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.

TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is between 12 - 15 V at idle.
• Before performing the following procedure, check that the engine coolant temperature is 

10

°

C

(14

°

F) or more.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE 

1.

Start engine and let it idle for at least 5 seconds.
If engine does not start, crank engine for at least 5 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-403, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217913

1.

CHECK FPCM POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect FPCM harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between FPCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

DETECT MALFUNCTIONING PART

Check the following.
• 15 A fuse (No.73)
• Harness for open or short between FPCM and IPDM E/R
• Loose or poor connection for each connector and harness

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

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1220

FPCM
(Fuel pump control module) 

During engine cranking, the signal voltage 
of the FPCM to the ECM is too low.

• Harness or connectors

(FPCM circuit is open or shorted)
(Fuel pump circuit is open or shorted)

• FPCM

FPCM

Ground

Voltage

Connector

Terminal

B41

10

Ground

Battery voltage

EC-404

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P1220 FUEL PUMP CONTROL MODULE (FPCM)

3.

CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check the continuity between FPCM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK FPCM INPUT AND OUTPUT CIRCUITS FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check the continuity between FPCM harness connector and ECM harness connector.

3.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between FPCM and ECM
• Loose or poor connection for each connector and harness

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

6.

CHECK FUEL PUMP CONTROL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect fuel level sensor unit and fuel pump harness connector.

2.

Check the continuity between FPCM harness connector and fuel level sensor unit and fuel pump harness
connector.

3.

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK FPCM

Refer to 

EC-405, "Component Inspection (FPCM)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace FPCM.

FPCM

Ground

Continuity

Connector

Terminal

B41

5

Ground

Existed

FPCM

ECM

Continuity

Connector

Terminal

Connector

Terminal

B41

8

E80

125

Existed

9

142

FPCM

Fuel level sensor unit and fuel pump

Continuity

Connector

Terminal

Connector

Terminal

B41

6

C5

3

Existed

7

1

P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-405

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (FPCM)

INFOID:0000000006217914

1.

CHECK FUEL PUMP CONTROL MODULE (FPCM)

1.

Check the voltage between FPCM terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace FPCM.

FPCM

Condition

Voltage

Connector

+

Terminal

Terminal

B41

7

6

For 1 second after turning ignition 
switch ON

Approx. 8.5 V

More than 1 second after turning 
ignition switch ON

Approx. 0 V

Idle speed

Approx. 8.5 V

 

 

 

 

 

 

 

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