Volt

Fuel Filler Door Release Malfunction

The hybrid powertrain control module 2 monitors the voltage values of the fuel fill door open request wake-up signal circuit and the fuel door request signal circuit. When the refuel request switch is pressed, the two switch contacts close. This provide B+ to the Wake-up Circuit input of the hybrid powertrain control module 2 and lowers the voltage on the fuel door request signal circuit input to the hybrid powertrain control module 2. The hybrid powertrain control module 2 detects the voltage on the signal circuits and commands the fuel system to vent and sends a serial data message to the driver information centre to display the Wait to Refuel message. The hybrid powertrain control module 2 then energises the fuel door lock/unlock actuator to unlock the fuel door.

Schematic Reference

Release Systems Schematics : Tailgate Schematics → Release System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel Fill Door Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Command the fuel filler door to LOCK and UNLOCK with the scan tool, the M97 fuel door lock actuator should LOCK and UNLOCK while changing between the commanded states.

⇒	If the fuel filler door does not perform as specified, refer to Fuel Filler Door Lock Malfunction.

2. Command the fuel filler door to UNLOCK by pressing the S117 refuel request switch, the M97 fuel door lock actuator should UNLOCK allowing the fuel filler door to open.

⇒	If the fuel filler door does not perform as specified, refer to Refuel Request Switch Malfunction.

3. With the fuel filler door locked, verify that the scan tool Fuel Door Lock parameter is Locked.

⇒	If not the specified value, refer to Fuel Door Lock Position Sensor Malfunction.

4. With the fuel filler door unlocked, verify that the scan tool Fuel Door Lock parameter is Unlocked.

⇒	If not the specified value, refer to Fuel Door Lock Position Sensor Malfunction.

Fuel Filler Door Lock Malfunction

1. Vehicle OFF, disconnect the harness connector at the M97 fuel door lock actuator.
2. Vehicle in Service Mode, verify that a test lamp illuminates between the control circuit terminal 1 and ground.

⇒	If the test lamp is OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

3. Verify that a test lamp illuminates between the control circuit terminal 2 and ground.

⇒	If the test lamp is OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

4. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2
5. Vehicle in Service Mode, command the fuel door 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 both control circuits for a short to voltage. If the circuits test normal, replace the K114B hybrid powertrain control module 2.

6. If all circuits test normal, test or replace the M97 fuel door lock actuator.

Refuel Request Switch Malfunction

1. Vehicle OFF, disconnect the harness connector at the S117 refuel request switch.
2. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Connect the harness connector at the S117 refuel request switch.
4. Disconnect the X2 harness connector at the K114B hybrid powertrain control module 2.
5. Connect a test lamp between the signal circuit terminal 7 and ground.
6. Observe the function of the test lamp while pressing and releasing the S117 refuel request switch. The test lamp should turn ON each time the switch is pressed.

⇒	If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the S117 refuel request switch.

⇒	If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S117 refuel request switch.

7. If all circuits test normal, replace the K114B hybrid powertrain control module 2.

Fuel Door Lock Position Sensor Malfunction

1. Vehicle OFF, disconnect the harness connector at the B208 fuel door status switch assembly.
2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Vehicle in Service Mode, test for 4.75 -- 5.25 V between the signal circuit terminal 3 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

4. If all circuits test normal, test or replace the B208 fuel door status switch assembly.

1. Vehicle OFF, disconnect the harness connector at the M97 fuel door lock 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 M97 fuel door lock actuator should perform the LOCK and UNLOCK functions.

⇒	If it does not perform as specified, replace the M97 fuel door lock actuator

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.