P0480

DTC P0480 (2.2L)

DTC Descriptor

DTC P0480

Cooling Fan Relay Control Circuit

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview





Circuit/System Description

The engine cooling fan system consists of one cooling fan and one relay. The relay is powered by the battery positive voltage circuit and controlled by a switched ground from the engine control module (ECM).

During operation, the ECM supplies the ground path for the cooling fan relay through the cooling fan relay control circuit. This energizes the cooling fan relay coil, closes the relay contacts, and supplies battery positive voltage from the cooling fan fuse through the cooling fan motor supply voltage circuit to the cooling fan. The cooling fan motor is grounded through its own ground circuit.

Conditions for Running the DTC

* The ignition is ON.
* The system voltage is between 9-18 volts.
* The relay control circuit is transitioned from OFF to ON, or ON to OFF.

Conditions for Setting the DTC

* An improper voltage level has been detected on the cooling fan relay control circuit.
* The condition must be present for a minimum of 30 seconds.

Action Taken When the DTC Sets

DTC P0480 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0480 is a Type B DTC.

Reference Information

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

* Cooling System Component Views
* Cooling System Connector End Views
* Engine Control Module Connector End Views

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

* Scan Tool Data List
* Scan Tool Data Definitions
* Scan Tool Output Controls

Circuit/System Verification

Ignition ON, command the relay ON and OFF with a scan tool. Feel or listen to verify that the relay turns ON and OFF with each command.

Circuit/System Testing

1. Ignition OFF, disconnect the relay.
2. Ignition ON, connect a test lamp between the positive terminal at the battery and the relay control circuit terminal at the relay connector.
3. Command the relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

^ If the test lamp is always ON, test the relay control circuit for a short to ground. If the circuit tests normal, replace the ECM.
^ If the test lamp is always OFF, test the relay control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

4. Connect a 30A fused jumper wire between the positive voltage terminal at the battery and the fan voltage supply circuit terminal and verify fan activation.

^ If the fan does not activate, test the fan voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the fan.

5. Ignition ON, connect a 30A fused jumper wire between the relay switch voltage supply circuit terminal and the fan voltage supply circuit terminal and verify fan activation.

^ If the fan does not activate, test the relay switch voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and it's fuse is open, test all connected components and replace as necessary.

6. Ignition ON, verify that a test lamp illuminates between the relay coil voltage supply circuit terminal and ground.

^ If the test lamp does not illuminate, test the relay coil voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse is open, test all connected components and replace as necessary.

7. If all circuits and the ECM test normal, replace the relay.

Repair Instructions

* Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Cooling Fan and Shroud Replacement (2.0L (LSJ)) Cooling Fan and Shroud Replacement (2.2L (L61), 2.4L (LE5))
* Fan Shroud Replacement
* Engine Control Module Replacement