P0481-FAN 2 CONTROL CIRCUIT SHORT CIRCUIT
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and the ECM High Speed Rad Fan Relay command on.
- Set Condition:
The ECM detects a short circuit on the High Speed Rad Fan Relay Control circuit.
| Possible Causes |
| INTERMITTENT CONDITION |
| HIGH SPEED RADIATOR FAN RELAY |
| (N112) HIGH SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO VOLTAGE |
| ENGINE CONTROL MODULE |
Diagnostic Test
1. CHECK FOR ACTIVE DTCNOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, actuate the High Speed Radiator Fan Relay.
Does the Radiator Fan cycle on and off?
Yes
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
- Go To 2
2. 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 Radiator Fan Relay.
Does the Radiator Fan cycle on and off?
Yes
- Replace High Speed Radiator Fan Relay.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go To 3
3. (N112) HIGH SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the High Speed Radiator Fan Relay from the PDC.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of (N112) High Speed Radiator Fan Control circuit.
Is the voltage below 1.0 volt?
Yes
- Replace and program the Engine Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Repair (N112) High Speed Radiator Fan Control circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).