|
|
MPI - Troubleshooting 13A-87 Inspection Procedure 24 Radiator fan control relay system Probable cause When the engine control relay turns ON, the radiator fan control relay turns ON simultaneously, and power is supplied to the fan controller. The radiator fan motor is driven when the fan motor drive signal is input to the fan controller from the engine-ECU. D Radiator fan control relay malfunction D Fan controller malfunction D Radiator fan motor malfunction D Engine-ECU malfunction OK (1) NG OK D Check the radiator fan control relay. (Refer to GROUP 14 - On-vehicle Service.) NG Replace the radiator fan control relay. Check the following connector: A-09X NG Repair OK OK (2) NG Check the following connectors: C-136 <R.H. drive vehicles>, A-13 <L.H. drive vehicles>, C-108, B-11X NG OK Check and repair the harness between the radiator fan control relay and body earth. Check for disconnection and damage of the earth cable. Repair OK Check the following connector: A-21 Check and repair the harness between the radiator fan control relay and engine control relay. Check for disconnection and short-circuit of the power cable. (3) NG Check and repair the harness between the battery and radiator fan control relay. Check for disconnection and short-circuit of the power cable. Measure at the A-09X radiator fan control relay connector. Remove the relay, and measure at the connector side. (1) Resistance between terminal No. 3 and earth OK: 2 Ω or less (2) Voltage between terminal No. 1 and earth (Ignition switch: ON) OK: System voltage (3) Voltage between terminal No. 4 and earth OK: System voltage NG Repair OK Measure at the A-21 fan controller connector. Disconnect the connector to measure at the harness side. D Ignition switch: ON D Voltage between terminal No. 3 and earth OK: System voltage To the next page NG OK Check the harness between the radiator fan control relay and fan controller. Check for disconnection and short-circuit of the output cable. NG Repair OK Check the following connectors: C-136 <R.H. drive vehicles>, A-13 <L.H. drive vehicles>, C-108, B-11X NG Repair OK OK Check the harness between the radiator fan control relay and engine control relay. Check for damage of the power cable. NG Repair Check and repair the harness between the radiator fan control relay and body earth. Check for damage of the earth cable. |