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• When Monitored: • Set Condition: Possible Causes FUSED B+ CIRCUITS (N112) RADIATOR FAN HIGH RELAY CONTROL CIRCUIT OPEN (N112) RADIATOR FAN HIGH RELAY CONTROL CIRCUIT SHORTED TO GROUND RADIATOR FAN HIGH RELAY FRONT CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. RADIATOR FAN HIGH RELAY OPERATION Ignition on, engine not running. With a scan tool, select Radiator Cooling Fan Relay #2 Control State, to actuate the Radiator Fan High Relay. Is the Cooling Fan Relay operating? Yes >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) No >> Go To 2 2. FUSED B+ CIRCUITS Turn the ignition off. Remove the Radiator High Fan Relay. Using a 12-volt test light connected to ground, probe the Fused B+ cir- Does the test light illuminate brightly? Yes >> Go To 4 No >> Go To 3 9 - 1428 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |