Diagnostic Procedure 34 (Cont'd) - Radiator Fan Control
EF & EC-163flowchartHarness connectors M59, E55 for L.H.D. models; M1, E3 for R.H.D. models.
TROUBLE DIAGNOSES
Diagnostic Procedure 34 (Cont'd)
Radiator Fan Control diagnostic (cont'd)
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(A) from previous page
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C: CHECK GROUND CIRCUIT. 1) Disconnect radiator fan motor harness connector. 2) Check harness continuity between radiator fan motor connector terminal (a) and radiator fan relay terminal (3); radiator fan motor connector terminal (b) and body ground. Continuity should exist.
N.G.
Repair harness or connectors.
O.K.
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D: CHECK OUTPUT SIGNAL CIRCUIT. 1) Disconnect E.C.U. harness connector. 2) Check harness continuity between E.C.U. terminal (9) and radiator fan relay terminal (1). Continuity should exist.
N.G.
Check the following. - Harness connectors F22, M19 - Harness connectors M59, E55 (L.H.D. models) - Harness connectors M1, E3 (R.H.D. models) - Harness continuity between E.C.U. and radiator fan relay. If N.G., repair harness or connectors.
Check the following. - Harness connectors F22, M19 - Harness connectors M59, E55 (L.H.D. models) - Harness connectors M1, E3 (R.H.D. models) - Harness continuity between E.C.U. and radiator fan relay. If N.G., repair harness or connectors.
O.K.
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CHECK COMPONENT (Radiator fan relay). Refer to "Electrical Components Inspection". (See page EF&EC 171 - 180)
N.G.
Replace radiator fan relay.
O.K.
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E: CHECK COMPONENT (Radiator fan motor). 1) Reconnect radiator fan relay, radiator fan motor harness connector and E.C.U. harness connector. 2) Perform "RADIATOR FAN CIRCUIT" in "FUNCTION TEST" mode with CONSULT. OR 2) Start engine. 3) Perform "RADIATOR FAN TEST" in "ACTIVE TEST" mode with CONSULT. OR Refer to "Electrical Components Inspection". (See page EF&EC 171 - 180)
N.G.
Replace radiator fan motor.
O.K.
Check E.C.U. pin terminals for damage or poor connection of E.C.U. harness connector.
See also
EF & EC-171 · EF & EC-180 · Electrical Components Inspection