Diagnostic Procedure 32 (Cont'd) — FUEL PUMP
EF & EC-156flowchartTROUBLE DIAGNOSES
Diagnostic Procedure 32 (Cont'd)
Fuel pump diagnostic procedure
1
INSPECTION START
2
A — CHECK OVERALL FUNCTION. 1) Turn ignition switch "ON". 2) Listen to fuel pump operating sound. Fuel pump should operate for 5 seconds after ignition switch is turned "ON".
O.K.
INSPECTION END
N.G.
3
B — CHECK POWER SUPPLY. 1) Turn ignition switch "OFF". 2) Disconnect fuel pump relay. 3) Turn ignition switch "ON". 4) Check voltage between fuel pump relay terminals (2), (5) and ground. Voltage: Battery voltage
N.G.
Check the following. - 15A fuse. - Harness continuity between fuse and fuel pump relay. If N.G., repair harness or connectors.
O.K.
4
C — CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Disconnect fuel pump harness connector. 3) Check harness continuity between fuel pump connector terminal (b) and body ground, fuel pump connector terminal (a) and fuel pump relay terminal (3). Continuity should exist.
N.G.
Repair harness or connectors.
O.K.
5
D — CHECK OUTPUT SIGNAL CIRCUIT. 1) Disconnect E.C.U. harness connector. 2) Check harness continuity between E.C.U. terminal 104 and fuel pump relay terminal (1). Continuity should exist.
N.G.
Check the following: - Harness connectors F22, M18. - Harness continuity between E.C.U. and fuel pump relay. If N.G., repair harness or connectors.
O.K.
6
(A) — return to A