P0691
DTC P0480, P0481, P0691, P0692, P0693, or P0694 (LCS) (3.6L Hybrid)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0480
- Cooling Fan Speed Output Circuit
DTC P0691
- Cooling Fan Speed Output Circuit Low Voltage
DTC P0692
- Cooling Fan Speed Output Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The engine control module (ECM) commands the cooling fans depending on cooling requirements. The ECM controls the cooling fan speed by commanding the cooling control module. The cooling fan control module supplies the power and ground circuits for both cooling fans. The ECM sends a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module interprets the signal and operates the cooling fans at the commanded speeds.
Conditions for Running the DTC
* The engine speed is greater than 0 RPM.
* The ignition voltage is between 10-18 volts.
* The DTCs run continuously once the above conditions are met.
Conditions for Setting the DTC
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 1 second.
Action Taken When the DTC Sets
DTCs P0480, P0691, and P0692 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0480, P0691, and P0692 are Type B DTCs.
Reference Information
Schematic Reference
Engine Cooling Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Cooling System Description and Operation (With HP5) (Description and Operation)Cooling System Description and Operation (Without HP5) (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Note: There is a slight delay before the cooling fans activate.
1. Ignition ON, command the fans ON and OFF with a scan tool. The cooling fans should respond to the commanded states.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector X1 at the cooling fan control module.
2. Test for less than 5 ohm between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
4. Test for 3-4 V between the control circuit terminal 4 and ground.
• If less than the specified range, test the control circuit for an open. If the circuit tests normal, replace the ECM.
• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Command the cooling fan ON and OFF with a scan tool. The DMM should transition from 3-4 V when commanded OFF to less than 1 V, when commanded ON.
• If the circuit voltage does not correspond to the specified values, test the control circuit for a high resistance. If the circuit tests normal, replace the ECM.
6. If all circuits test normal, replace the cooling fan control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Fan Control Module Replacement (HP5) (Service and Repair)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming