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3. LOW SPEED RADIATOR FAN RELAY Turn the ignition off. Install a substitute relay in place of the Low Speed Radiator Fan Relay. Turn the ignition on. With the scan tool, actuate the Low Speed Rad Fan Relay. Does the Radiator Fan cycle on and off? Yes >> Replace the Low Speed Radiator Fan Relay. Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go To 4 4. (N201) LOW SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Remove the Low Speed Radiator Fan Relay from the PDC. Disconnect the ECM C1 harness connectors. Measure the resistance between ground and the (N201) Low Speed Is the resistance above 1000 ohms? Yes >> Go To 5 No >> Repair the (N201) Low Speed Radiator Fan Control circuit for a short to ground. Perform the ECM Verification Test Ver. 1 (Refer to 9 - 5. (N201) LOW SPEED RADIATOR FAN CONTROL CIRCUIT OPEN Measure the resistance of the (N201) Low Speed Radiator Fan Control Is the resistance below 10.0 ohms? Yes >> Replace and program the Engine Control Module in accor- dance with the Service Information. Perform the ECM Verification Test Ver. 1 (Refer to 9 - No >> Repair the (N201) Low Speed Radiator Fan Control circuit for an open. Perform the ECM Verification Test Ver. 1 (Refer to 9 - 9 - 966 ENGINE DIESEL DIAG KJ |