2010 Cadillac CTS Sedan AWD V6-3.0L Page 1986

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1986

Action Taken When the DTC Sets

DTC P2636 is a Type C DTC.

Conditions for Clearing the MIL/DTC

DTC P2636 is a Type C DTC.

Diagnostic Aids

Depending on the current fuel level, it may be difficult to locate a malfunctioning fuel level sensor. The condition may only occur when the fuel

level is full or near empty. The fuel level sensor unit may need to be removed for further diagnosis. A fuel level sensor that has an intermittent

condition causes this DTC to set.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

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

Description and Operation

Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

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

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

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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. Engine idling for 5 minutes, observe the DTC information with a scan tool. DTC P2636 should not set.

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 of the left side fuel level sensor.

2. Ignition ON, verify the scan tool Fuel Level Sensor Left Tank voltage parameter is at 5.0 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

3. Install a 3 A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Fuel Level Sensor Left Tank voltage

parameter is at 0.0 V.

瀚慖f greater than the specified value, test the signal circuit for a high resistance. If the circuit tests normal, replace the ECM.

4. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal D. Verify the scan tool Fuel Level

Sensor Left Tank voltage parameter is at 0.0 V.

瀚慖f greater than the specified value, test the low reference circuit for a high resistance. If the circuit tests normal, replace the ECM.

5. Remove the fuel tank.

6. Remove the fuel tank primary and secondary fuel pump modules and inspect for the following conditions:

* A clogged secondary fuel strainer and pick up

* A clogged or restricted siphon jet pump