Engine General Information and Diagnosis: 1A-242
6
Fuel pump relay drive signal check
1) Measure voltage within 2 second after ignition switch is
turned ON.
Is voltage 0 – 1 V?
Go to Step 7.
Substitute a known-
good ECM and recheck.
7
Wire circuit check
1) Turn OFF ignition switch.
2) Detach fuel tank referring to “Fuel Tank Removal and
Installation: in Section 1G”.
3) Disconnect connector from fuel pump.
4) Measure resistance between “PNK” wire terminal of fuel
pump connector and vehicle body ground.
Is resistance infinity?
Go to Step 8.
“PNK” wire is shorted to
ground.
8
Fuel pump circuit check
1) Connect service wire between “E23-15” terminal of ECM
connector and vehicle body ground.
2) Turn ON ignition switch, measure voltage between
“PNK” terminal at fuel pump connector and vehicle body
ground.
Is voltage 10 – 14 V?
Go to Step 9.
“PNK” wire is open
circuit.
9
Fuel pump circuit check
1) Turn OFF ignition switch.
2) Measure resistance between “BLK” wire terminal at fuel
pump connector and vehicle body ground.
Is resistance less than 5
Ω
?
Faulty fuel pump.
“BLK” wire is open
circuit.
Step
Action
Yes
No
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