Diagnostic Procedure 35 (Cont'd) - PROCEDURE A
EF & EC-331flowchartPROCEDURE A diagnoses the radiator fan low-speed control circuit (A/T hot-area, two-speed fan). Output signal harness-connector checks differ between L.H.D. (E33/M37, M11/E106) and R.H.D. (F6/E15) models.
PROCEDURE A
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PROCEDURE A
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INSPECTION START
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[H] CHECK POWER SUPPLY. 1) Stop engine. 2) Disconnect radiator fan relay-1. 3) Turn ignition switch "ON". 4) Check voltage between terminals (2), (5) and ground. Voltage: Battery voltage
N.G.
Check the following. - Harness connectors (M11), (E106) - 10A fuse - "G" fusible link - "GY" fusible link - Harness continuity between radiator fan relay-1 and fuse - Harness continuity between radiator fan relay-1 and battery If N.G., repair harness or connectors.
Check the following. - Harness connectors (M11), (E106) - 10A fuse - "G" fusible link - "GY" fusible link - Harness continuity between radiator fan relay-1 and fuse - Harness continuity between radiator fan relay-1 and battery If N.G., repair harness or connectors.
O.K.
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[I] CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Disconnect radiator fan motor-1 harness connector and radiator fan motor-2 harness connector. 3) Check harness continuity between terminals (3) and terminal (a), terminal (d) and body ground. Continuity should exist.
N.G.
Repair harness or connectors.
O.K.
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[J] CHECK OUTPUT SIGNAL CIRCUIT. 1) Disconnect E.C.U. harness connector. 2) Check harness continuity between E.C.U. terminal (9) and terminal (1). Continuity should exist.
N.G.
Check the following. - Harness connectors (E33), (M37) (L.H.D. models) - Harness connectors (M11), (E106) (L.H.D. models) - Harness connectors (F6), (E15) (R.H.D. models) - Harness continuity between radiator fan relay-1 and E.C.U. If N.G., repair harness or connectors.
Check the following. - Harness connectors (E33), (M37) (L.H.D. models) - Harness connectors (M11), (E106) (L.H.D. models) - Harness connectors (F6), (E15) (R.H.D. models) - Harness continuity between radiator fan relay-1 and E.C.U. If N.G., repair harness or connectors.
O.K.
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[K] CHECK COMPONENT (Radiator fan relay-1). Refer to "Electrical Components Inspection". (See page EF & EC-351.)
N.G.
Replace radiator fan relay.
O.K.
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A (continues to EF & EC-332)