Trouble Diagnoses — Radiator Fan Motor (Cont'd)
LC-51flowchartRADIATOR FAN MOTOR ELECTRICAL CIRCUIT
Trouble Diagnoses — Radiator Fan Motor (Cont'd)
SYMPTOM: Even though the engine coolant is hot, the radiator fan motor does not rotate.
IMPORTANT
This check should be performed after engine is warmed up sufficiently.
Radiator Fan Motor Diagnostic
1
CHECK POWER SUPPLY. 1) Turn ignition switch "ON". 2) Disconnect radiator fan harness connector. 3) Check voltage between (a) and ground. Battery voltage should exist.
O.K.
CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Disconnect radiator fan motor harness connector. 3) Check harness continuity between (a) and ground. Continuity should exist. If N.G., repair harness.
CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Disconnect radiator fan motor harness connector. 3) Check harness continuity between (a) and ground. Continuity should exist. If N.G., repair harness.
N.G.
2
1) Turn ignition switch "OFF". 2) Disconnect radiator fan relay. 3) Check voltage between terminal (1) and ground. Battery voltage should exist. If N.G., check harness continuity between (+) pole and terminal (1).
3
4) Check harness continuity between radiator fan relay terminal (3) and radiator fan motor harness connector terminal (1). Continuity should exist. If N.G., repair harness.
O.K.
4
1) Turn ignition switch "ON". 2) Check voltage between terminal (2) and ground. Battery voltage should exist. If N.G., check following parts: Harness continuity between fuse and terminal (2); Fuse.
O.K.
5
A