P0480-FAN 1 CONTROL CIRCUIT EXCESSIVE CURRENT

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on and the ECM Low Speed Rad Fan Relay command on.
Set Condition:
The ECM detects excessive current on the Low Speed Rad Fan Relay Control circuit.

Possible Causes

INTERMITTENT CONDITION

LOW SPEED RADIATOR FAN RELAY

(N201) LOW SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO VOLTAGE

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 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.

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)

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2.LOW SPEED RADIATOR 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).

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3.(N201) LOW SPEED RADIATOR FAN CONTROL CIRCUIT SHORTED TO VOLTAGE

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).

Repair the (N201) Low Speed Radiator Fan Control circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).