Nissan Titan A60. Manual - part 424

EC-362

< DTC/CIRCUIT DIAGNOSIS >

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P1220 FUEL PUMP CONTROL MODULE (FPCM)

Before performing the following procedure, confirm that battery voltage is more than 11V with ignition

switch ON.

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

2. Make sure that “COOLAN TEMP/S” indicates less than 70

°C (158°F). If not, cool down the engine.

3. Start engine.

4. Hold vehicle at the following conditions for 12 seconds.

5. Check 1st trip DTC.

6. If 1st trip DTC is detected, go to 

EC-362, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006158822

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body.

Refer to 

EC-139, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK FPCM POWER SUPPLY CIRCUIT

1. Disconnect fuel pump control module (FPCM) harness connector.

2. Turn ignition switch ON.

3. Check voltage between FPCM terminal 4 and ground with CON-

SULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

ENG SPEED

1,100 - 2,600 rpm

VHCL SPEED SE

More than 70 km/h (43 MPH)

B/FUEL SCHDL

0 - 25 msec

Selector lever

Suitable position

BBIA0354E

Voltage: Battery voltage

BBIA0599E

PBIB2754E

P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-363

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3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness for open or short between FPCM and IPDM E/R

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

4.

CHECK FPCM GROUND CIRCUIT-I FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Check harness continuity between FPCM terminal 1 and ground.

Refer to Wiring Diagram.

3. Also check harness for short to power.
OK or NG

OK

>> GO TO 5.

NG

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

5.

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 the following;

“fuel level sensor unit and fuel pump” terminal 3 and dropping

resistor terminal 2, 

FPCM terminal 2 and dropping resister terminal 2.

Refer to Wiring Diagram.

4. Check harness continuity between the following;

FPCM terminal 2 and ground, 

“fuel level sensor and fuel pump” terminal 3 and ground.

Refer to Wiring Diagram.

5. Also check harness for short to power.
OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

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

• Harness connectors C1, E41

• Harness for open or short between FPCM and dropping resistor

• Harness for short between “fuel level sensor unit and fuel pump” and ground

• Harness for short between FPCM and ground

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

7.

CHECK FPCM INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminal 38 and FPCM terminal 2.

Refer to Wiring Diagram.

3. Check harness continuity between ECM terminal 38 and ground.

Continuity should exist.

Continuity should exist.

Continuity should not exist.

BBIA0442E

Continuity should exist.

EC-364

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

P1220 FUEL PUMP CONTROL MODULE (FPCM)

Refer to Wiring Diagram.

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

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F32, E2

• Harness for open or short between ECM and FPCM

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

9.

CHECK FPCM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 39 and FPCM terminal 3.

Refer to Wiring Diagram.

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

OK

>> GO TO 11.

NG

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F32, E2

• Harness for open or short between ECM and FPCM

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

11.

CHECK FPCM

Refer to 

EC-364, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> Replace FPCM.

12.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "How to Check Terminal"

 and 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006158823

FUEL PUMP CONTROL MODULE (FPCM)

Continuity should not exist.

Continuity should exist.

BBIA0599E

P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-365

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1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Check voltage between FPCM terminal 2 and 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

PBIB2755E