Fuel Filler Door Release Malfunction
Fuel Filler Door Release Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The locking and unlocking of the fuel door is a function of the power door lock system. The fuel door unlatch actuator shares the circuit with the door latch unlock control circuit. The body control module (BCM), upon receipt of a lock switch lock or unlock signal, will switch the appropriate door latch, as well as a fuel filler door unlatch actuator control circuits to B+ voltage. The opposing side of the door latch and fuel filler door unlatch actuator is connected to ground provided by the BCM through the other the door latch control circuits, along with the fuel filler door unlatch actuator, will lock or unlock as commanded.
Reference Information
Schematic Reference
Release Systems Schematics (Release Systems Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Fuel Fill Door Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Command the door latches to LOCK and UNLOCK with a scan tool, Each interior door lock knob should move between LOCK and UNLOCK.
• If any or all doors do not LOCK or UNLOCK, refer to Power Door Locks Malfunction (Power Door Locks Malfunction).
2. Command the door latches to LOCK and UNLOCK with a scan tool, the M27 fuel door release actuator should LOCK and UNLOCK while changing between the commanded states.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the M27 fuel door release actuator.
2. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2.
3. Command the door latches to LOCK and UNLOCK with a scan tool, the test lamp should briefly illuminate while changing between the commanded states.
• If the test lamp is always OFF, test either control circuit for an open/high resistance.
4. If all circuits test normal, test or replace the M27 fuel door release actuator.
Component Testing
Fuel Door Latch
1. Ignition OFF, disconnect the harness connector at the M27 fuel door release actuator.
2. Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M27 fuel door release actuator should perform the LOCK and UNLOCK functions.
• If it does not perform as specified, replace the M27 fuel door release actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Fuel Tank Filler Door Replacement (Service and Repair)