|
|
ENGINE COOLING - Special Tools/Troubleshooting 14-3 SPECIAL TOOLS Tool Number Name Use A B C D MB991223 B: MB991220 C: MB991221 D: MB991222 Harness set B: LED harness C: LED harness adapter D: Probe D Measurement of terminal voltage D Inspection of radiator fan controller A: Connector pin contact pressure inspection B: Power circuit inspection C: Power circuit inspection D: Commercial tester connection MB991658 Test harness Inspection of radiator fan controller APS MB991791 Throttle cotroller Inspection of radiator fan controller [Use the accelerator pedal position sensor disconnected from harness.] TROUBLESHOOTING INSPECTION CHART FOR TROUBLE SYMPTOMS Trouble symptoms Inspection procedure No. Reference page Radiator fan does not operate. 1 14-3 Radiator fan does not change speed or stop. 2 14-5 INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS Inspection Procedure 1 Radiator fan does not operate. Probable cause Failure may occur on the power supply of the radiator fan controller and the earth circuit. Failure may also occur on the radiator fan controller and engine-ECU. D Malfunction of fusible link D Malfunction of radiator fan relay D Malfunction of radiator fan controller D Malfunction of radiator fan motor D Malfunction of engine-ECU D Malfunction of harness, connector |