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
C
D
E
F
G
H
I
J
K
L
M
A
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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