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4-1-35 FISYSTEM DIAGNOSIS<br />
“C41” FUEL PUMP RELAY CIRCUIT MALFUNCTION<br />
▣ INSPECTION<br />
◈ Step 1<br />
1) Remove the frame cover.<br />
2) Turn the ignition switch “OFF” position.<br />
3) Check the fuel pump relay coupler for loose or<br />
poor contacts.<br />
If OK, then check the insulation and continuity.<br />
Refer to page 4-2-5 for details.<br />
Is the Fuel pump relay OK?<br />
DETECTED CONDITION POSSIBLE CAUSE<br />
Voltage is applied continuous over 5 sec., battery<br />
voltage � 5 V when fuel pump relay is “OFF” position<br />
or battery voltage � 5 V when fuel pump relay is<br />
“ON” position.<br />
YES<br />
NO<br />
● GW wire open or shorted to<br />
ground, or poor 58 connection.<br />
● If wire and connection are OK,<br />
intermittent trouble or faulty ECU.<br />
● Recheck each terminal and wire<br />
harness for open circuit and poor<br />
connection.<br />
● Inspect the fuel injectors. (Refer to<br />
page 4-1-33)<br />
Replace the fuel pump relay with a<br />
new one.<br />
46<br />
● Fuel pump relay circuit open or short.<br />
● Fuel pump relay malfunction.<br />
● ECU malfunction.<br />
58<br />
ECU Coupler
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