ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-153
4 Check fuel pump relay.
1) Check fuel pump relay, referring to “Main
Relay, Fuel Pump Relay and Radiator Fan
Relay Inspection” in Section 6E2.
Is relay in good condition?
Go to Step 5. Faulty relay.
5 Check fuel pump relay drive signal.
1) Connect fuel pump relay to relay box.
2) Connect voltmeter between “E23-14” terminal
and vehicle body ground.
3) Measure voltage at after 3 second ignition
switch turned ON.
Is voltage 10 – 14 V?
Go to Step 6. “GRN” wire open cir-
cuit or shorted to
ground circuit.
6 Check fuel pump relay drive signal.
1) Measure voltage at within 3 second after igni-
tion switch turned ON.
Is voltage 0 – 1 V?
Go to Step 7. Substitute a known-
good ECM and
recheck.
7 Check wire circuit.
1) Turn OFF ignition switch.
2) Detach fuel tank, referring to “Fuel Tank
Removal and Installation” in Section 6C.
3) Disconnect connector from fuel pump.
4) Measure resistance between “PNK” wire termi-
nal and vehicle body ground.
Is resistance infinity?
Go to Step 8. “PNK” wire shorted to
ground.
8 Check fuel pump circuit.
1) Turn OFF ignition switch.
2) Connect service wire between “E23-14” termi-
nal and vehicle body ground.
3) Turn ON ignition switch, measure voltage
between “PNK” terminal at fuel pump connec-
tor and vehicle body ground.
Is voltage 10 – 14 V?
Go to Step 9. “PNK” wire open cir-
cuit.
9 Check fuel pump circuit.
1) Turn OFF ignition switch.
2) Check that there is continuity between “BLK”
terminal at fuel pump connector and vehicle
body ground.
Is there continuity?
Faulty fuel pump. “BLK” wire open cir-
cuit.
[A]: Fig. 1 for Step 1
Step Action Yes No
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