2010 Cadillac Truck SRX FWD V6-3.0L Page 1528

2010 Cadillac Truck SRX FWD V6-3.0L Page 1528

* The ignition voltage is between 11-18 volts.

* The engine speed is greater than 400 RPM.

* The ECM driver transitions from ON to OFF or from OFF to ON.

* DTC P0481 runs continuously when the conditions above are met.

Conditions for Setting the DTC

P0481

The ECM detects an open circuit, short to ground, or a short to voltage on the medium and high speed cooling fan relay control circuit, for greater

than 200 mS.

Action Taken When the DTC Sets

DTC P0481 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0481 is a Type B DTC.

Diagnostic Aids

* The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the

scan tool Cooling Fan Relay Command parameters to know which fans are being commanded ON by the ECM.

* The scan tool cooling fan output control operates as follows:

- Cooling Fan Relay 1 operates the fan at a low speed

- Cooling Fan Relay 2 and 3 operates the fan at a medium speed

- Cooling Fan Relay 1, 2 and 3 operates the fan at a high speed

* When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the

correct orientation in the fuse block. Test the mating electrical terminals for tightness.

Reference Information

Schematic Reference

Engine Cooling Schematics (See: Engine, Cooling and Exhaust/Cooling System/Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Cooling Fan Description and Operation (LAU) (See: Engine, Cooling and Exhaust/Cooling System/Description and Operation/Cooling Fan

Description and Operation)Cooling Fan Description and Operation (LF1) (See: Engine, Cooling and Exhaust/Cooling System/Description and

Operation/Cooling Fan Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Ignition ON, observe the scan tool parameters listed below. Command the cooling fan ON and OFF with a scan tool. The parameters should

display OK or Not Run in each of the commanded states.