FI SYSTEM DIAGNOSIS 12-42
“41” FP RELAY CIRCUIT MALFUNCTION
INSPECTION
Step 1
1) Stop the engine.
2) Remove the front number plate. ("18-4)
3) Check the ECM coupler for loose or poor contacts.
If OK, then measure the FP relay input voltage.
4) Remove the ECM mounting bolts.
5) Disconnect the ECM coupler.
DETECTED CONDITION POSSIBLE CAUSE
No voltage is applied to the fuel pump although FP
relay is turned ON.
• FP relay circuit open or short.
• FP relay (ECM) malfunction.
ECM
Regulator
/rectifier
Condenser
Magneto
Fuel
pump
relay
Fuel pump
M
FPP
FP
R
R/B
CAUTION
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle pointed tester probe to prevent the terminal damage or terminal bend.
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