Nissan Frontier D22. Manual - part 362
FUEL PUMP CIRCUIT
EC-551
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuse block (J/B) connector M31
●
15A fuse
●
Harness for open or short between fuse and fuel pump relay
>> Repair harness or connectors.
4.
CHECK POWER GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
3.
Check harness continuity between fuel pump terminal 6 and
body ground, fuel pump terminal 5 and fuel pump relay terminal
3.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors C1, M67
●
Harness for open or short between fuel pump and body ground
●
Harness for open or short between fuel pump and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK OUTPUT SIGNAL CIRCUIT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 11 and fuel pump relay terminal 1.
Refer to Wiring Diagram.
3.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F36, M81
●
Harness for open or short between ECM and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
Continuity should exist.
SEF334VA
Continuity should exist.