Infiniti F50. Manual - part 469

 

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Infiniti F50. Manual - part 469

 

 

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-517

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EC

Diagnostic Procedure

EBS00MK2

1. 

CHECK FPCM POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect FPCM harness connector.

3.

Turn ignition switch “ON”.

4.

Check voltage between FPCM terminal 2 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors M141, B211

Harness for open or short between FPCM and harness connector B211

>> Repair harness or connectors.

3. 

CHECK FPCM GROUND CIRCUIT-I FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Check harness continuity between FPCM terminal 3 and body ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 4.

NG

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

Voltage: Battery voltage

PBIB1129E

PBIB0099E

Continuity should exist.

EC-518

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

4. 

CHECK FPCM GROUND CIRCUIT-II FOR OPEN AND SHORT

1.

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

2.

Disconnect dropping resistor harness connector.

3.

Check harness continuity between fuel level sensor unit and fuel
pump terminal 1 and dropping resistor terminal 2, FPCM termi-
nal 4 and dropping resister terminal 2.
Refer to Wiring Diagram.

4.

Check harness continuity between FPCM terminal 4 and
ground, fuel level sensor and fuel pump terminal 1 and ground.
Refer to Wiring Diagram.

5.

Also check harness for short to power.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors B63, B263

Harness for open or short between fuel level sensor unit and fuel pump and dropping resistor

Harness for open or short between FPCM and dropping resistor

Harness for open or short between fuel level sensor unit and fuel pump and body ground

Harness for open or short between FPCM and body ground

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

6. 

CHECK FPCM INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 116 and FPCM terminal 4.
Refer to Wiring Diagram.

3.

Check harness continuity between ECM terminal 116 and ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

Continuity should exist.

Continuity should not exist.

PBIB1249E

Continuity should exist.

Continuity should not exist.

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-519

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EC

7. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors F105, M135

Harness connectors M141, B211

Harness for open or short between ECM and FPCM

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

8. 

CHECK FPCM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 25 and FPCM terminal 1.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 9.

9. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors F105, M135

Harness connectors M141, B211

Harness for open or short between ECM and FPCM

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

10. 

CHECK FPCM

Refer to 

EC-519, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11.

NG

>> Replace FPCM.

11. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

EBS00MK3

FUEL PUMP CONTROL MODULE

1.

Start engine and warm it up to normal operating temperature.

Continuity should exist.

PBIB0032E

EC-520

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

2.

Turn ignition switch “OFF” and wait at least 10 seconds.

3.

Check voltage between FPCM terminal 4 and body ground
under the following conditions.

4.

If NG, replace fuel pump control module.

Condition

Voltage

When engine cranking

Approx. 0V

After starting engine

Approx. 5V

PBIB0101E

 

 

 

 

 

 

 

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