Infiniti Q45. Manual - part 475

 

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Infiniti Q45. Manual - part 475

 

 

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-539

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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 1 and dropping
resistor terminal 2, 
FPCM terminal 4 and dropping resister terminal 2.
Refer to Wiring Diagram.

4.

Check harness continuity between the following;
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 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors B63, B263

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

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Harness for open or short between FPCM and dropping resistor

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

●

Harness for open or 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 4.
Refer to Wiring Diagram.

3.

Check harness continuity between ECM terminal 38 and ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

Continuity should exist.

Continuity should not exist.

PBIB1249E

Continuity should exist.

Continuity should not exist.

EC-540

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

8. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F105, M135

●

Harness connectors M141, B211

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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 1.
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 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.

11. 

CHECK FPCM

Refer to 

EC-540, "Component Inspection"

 .

OK or NG

OK

>> GO TO 12.

NG

>> Replace FPCM.

12. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS00225

FUEL PUMP CONTROL MODULE

1.

Start engine and warm it up to normal operating temperature.

Continuity should exist.

PBIB0032E

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-541

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2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Check voltage between FPCM terminal 4 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

PBIB0101E

EC-542

DTC P1225 TP SENSOR

DTC P1225 TP SENSOR

PFP:16119

Component Description

NBS00226

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 the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi-
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
tion.

On Board Diagnosis Logic

NBS00227

The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

NBS00228

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Turn ignition switch OFF, wait at least 10 seconds.

4.

Turn ignition switch ON.

5.

If 1st trip DTC is detected, go to 

EC-543, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1225
1225

Closed throttle position 
learning performance

Closed throttle position learning value is exces-
sively low.

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Electric throttle control actuator
(TP sensor 1 and 2)

SEF058Y

 

 

 

 

 

 

 

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