Powertrain Controls Diagnosis (BI-Fuel)

DTC P0200

Circuit Description

The PCM controls fuel delivery and determines fuel system operation on Bi-fuel (KL6) vehicles. The PCM is not capable of operating the high current CNG fuel injectors. The PCM injector control signals are received by the fuel injector control module (FICM) and duplicate control signals are generated by the FICM in order to operate the CNG injectors. On Bi-fuel equipped vehicles, the FICM switches off the CNG fuel injectors and re-routes the injector control signals from the PCM to the gasoline fuel injectors. A fused ignition voltage is supplied to all of the fuel injectors. The PCM monitors the status of each injector control circuit. DTC P0200 will set if there is condition on a control circuit between the PCM and FICM. On Bi-fuel (KL6) vehicles, DTC P0200 can set during gasoline operation, if a circuit condition is detected between the FICM and a gasoline fuel injector.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

- The powertrain control module (PCM) detects an incorrect voltage on a fuel injector control circuit.
- The condition exists for 5 seconds.

Action Taken When the DTC Sets

- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module switches over to gasoline fuel operation.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Conditions for Clearing the MIL/DTC

- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

- Performing the Fuel Injector Coil Test on the gasoline fuel injectors may help to isolate an intermittent condition.
- For an intermittent condition, refer to Intermittent Conditions.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2. This step verifies that a condition exists.
4. The step determines if the condition occurs during gasoline operation. If the vehicle misfires while on gasoline, then the condition is between the FICM and the gasoline fuel injector.
6. This step tests the control circuit between the PCM and the FICM. The test lamp should blink while the engine is cranking.
10. This step verifies that an ignition voltage is supplied to the gasoline fuel injector. If the ignition voltage circuit is open DTC P0200 will set while operating on gasoline.
11. This step tests the control circuit between the FICM and the gasoline fuel injector. A switch to gasoline is necessary in order to pulse the gasoline fuel injectors. The test lamp should blink while the engine is operating.