Infiniti QX4 (R50). Manual — part 290
Wiring Diagram
NBEC0396
MEC976C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FUEL PUMP
Wiring Diagram
EC-627
Diagnostic Procedure
NBEC0397
1
CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Pinch fuel feed hose with two fingers.
SEF025Z
Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned “ON”.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 2.
2
CHECK FUEL PUMP RELAY-1 and -2 POWER SUPPLY CIRCUIT-I
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump relay-1 and -2.
SEF346Z
3. Turn ignition switch “ON”.
4. Check voltage between terminals 2 and ground with CONSULT-II or tester.
SEF347Z
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
FUEL PUMP
Diagnostic Procedure
EC-628
3
DETECT MALFUNCTIONING PART
Check the following.
I
Fuse block (J/B) connector M10
I
15A fuse in fuse block (J/B)
I
Harness connectors M1, E1
I
Harness for open or short between fuse and fuel pump relay-1 and fuel pump relay-2
©
Repair harness or connectors.
4
CHECK FUEL PUMP RELAY-1 POWER SUPPLY CIRCUIT-II
Check voltage between terminal 3 and ground with CONSULT-II or tester.
SEF348Z
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 5.
5
CHECK FUEL PUMP RELAY-2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect fuel pump relay-2.
2. Check harness continuity between fuel pump relay-2 terminal 5 and fuel pump relay-1 terminal 3. Refer to Wiring Dia-
gram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 6.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FUEL PUMP
Diagnostic Procedure (Cont’d)
EC-629
6
CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT-III
1. Turn ignition switch “OFF”.
2. Disconnect fuel pump relay-2.
3. Turn ignition switch “ON”.
4. Check voltage between terminals 2, 3 and ground with CONSULT-II or tester.
SEF026Z
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
7
DETECT MALFUNCTIONING PART
Check the following.
I
15A fuse in fusible link and relay box
I
Harness for open or short between fuse and fuel pump relay-2
©
Repair harness or connectors.
8
CHECK FUEL PUMP RELAY-2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between fuel pump relay-2 terminal 1 and ground.
Continuity should exist.
2. Also check harness for short to power.
OK or NG
©
Repair open circuit or short to power in harness or connector.
FUEL PUMP
Diagnostic Procedure (Cont’d)
EC-630
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