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• When Monitored: • Set Condition: Possible Causes INTERMITTENT CONDITION ASD RELAY OUTPUT CIRCUIT OPEN LOW SPEED RADIATOR FAN RELAY (N201) LOW SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO GROUND (N201) LOW SPEED RADIATOR FAN CONTROL CIRCUIT OPEN ENGINE CONTROL MODULE Diagnostic Test 1. CHECK FOR ACTIVE DTC NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may With the scan tool, actuate the Low Speed Radiator Fan Relay. Does the Radiator Fan cycle on and off? Yes >> Go To 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. ASD RELAY OUTPUT CIRCUIT OPEN Turn the ignition off. Remove the Low Speed Radiator Fan Relay from the PDC. Turn the ignition on. Using a 12-volt test light connected to ground, check the ASD Relay Did the test light illuminate brightly? Yes >> Go To 3 No >> Repair the ASD Relay Output circuit for an open. Perform the ECM Verification Test Ver. 1 (Refer to 9 - 9 - 962 ENGINE DIESEL DIAG KJ |