Test Description
WARNING: This page is about a different car, the 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedure.
- 2 - The step determines if the condition exists. When DTC P1020 sets, the vehicle will switch over to gasoline operation.
- 4 - The step determines if the condition affects CNG and gasoline operation.
- 5 - This step tests the fuel injector control circuit from the PCM to the AF injector relay. If the test light blinks, the PCM and wiring are okay.
- 6 - This step determines if a ground is constantly applied to the fuel injector control circuit.
- 8 - This step tests the fuel injector signal circuit from the FICM. If the test light illuminates, the FICM and wiring are okay.
- 9 - This step isolates the inoperative AF injector relay. Remove the AF injectors from the mounting bracket to prevent misdiagnosis.
- 10 - This step tests the ignition voltage circuits to each AF injector relay coil.
- 11 - This step tests the ground circuits to each AF injector relay coil.