Infiniti FX35, FX50 (S51). Manual - part 865

P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-1001

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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7.

CHECK FUEL PUMP CONTROL CIRCUIT FOR OPEN AND SHORT

1.

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

2.

Check the continuity between FPCM harness connector and “fuel level sensor unit and fuel pump (main)”
harness connector.

3.

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

Is the inspection result normal?

YES

>> GO TO 8.

NO

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

8.

CHECK FPCM

Refer to 

EC-1001, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace FPCM.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005237481

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

Fuel level sensor unit and fuel pump (main)

Continuity

Connector

Terminal

Connector

Terminal

B31

6

B22

3

Existed

7

1

FPCM

Condition

Voltage

Connector

+

−

Terminal

Terminal

B31

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

EC-1002

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1225, P1234 TP SENSOR

P1225, P1234 TP SENSOR

Description

INFOID:0000000005237482

Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement. 
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.

DTC Logic

INFOID:0000000005237483

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
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 more than 10 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-1002, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237484

1.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1.

Turn ignition switch OFF.

2.

Remove the intake air duct.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1225

Closed throttle position learning 
performance (bank 1)

Closed throttle position learning value is 
excessively low.

• Electric throttle control actuator

(TP sensor 1 and 2)

P1234

Closed throttle position learning 
performance (bank 2)

P1225, P1234 TP SENSOR

EC-1003

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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3.

Check that no foreign matter is caught between the throttle valve
(1) and the housing.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace malfunctioning electric throttle control actuator.

2.

Perform 

EC-1003, "Special Repair Requirement"

.

>> INSPECTION END

Special Repair Requirement

INFOID:0000000005237485

1.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to 

EC-581, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.

2.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-582, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

JMBIA1556ZZ

EC-1004

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1226, P1235 TP SENSOR

P1226, P1235 TP SENSOR

Description

INFOID:0000000005237486

Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement. 
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.

DTC Logic

INFOID:0000000005237487

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
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 more than 10 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Repeat steps 2 and 3 for 32 times.

5.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-1004, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237488

1.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1.

Turn ignition switch OFF.

2.

Remove the intake air duct.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1226

Closed throttle position learning 
performance (bank 1)

Closed throttle position learning is not 
performed successfully, repeatedly.

• Electric throttle control actuator

(TP sensor 1 and 2)

P1235

Closed throttle position learning 
performance (bank 2)