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• When Monitored: • Set Condition: Possible Causes INTERMITTENT CONDITION ASD RELAY OUTPUT CIRCUIT OPEN HIGH SPEED RADIATOR FAN RELAY (N112) HIGH SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO GROUND (N112) HIGH 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 High 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 High Speed Radiator Fan Relay from the PDC. Turn the ignition on. Using a 12-volt test light connected to ground, check the ASD Relay Output circuit. 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 - ENGINE - DIAGNOSIS AND TESTING). 3. HIGH SPEED RADIATOR FAN RELAY Turn the ignition off. Install a known good relay in place of the High Speed Radiator Fan Relay. Turn the ignition on. With the scan tool, actuate the High Speed Rad Fan Relay. Does the Radiator Fan cycle on and off? Yes >> Replace the High Speed Radiator Fan Relay. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 4 9 - 974 ENGINE DIESEL DIAG KJ |