P1207

DTC P1207

CIRCUIT DESCRIPTION
The fuel injector control module (FICM) monitors the compressed natural gas (CNG) fuel tank pressure (FTP) sensor, the fuel tank temperature (FTT) sensor, and the fuel rail temperature (FRT) sensor. The FTP, FTT, and FRT sensor values, and FICM diagnostic status, is communicated to the powertrain control module (PCM) by 2 pulse width modulated (PWM) circuits.

This DTC sets when the sensor value PWM output signal is not received by the PCM.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P1207 Fuel Injector Control Module Sensor Signal Circuit 1

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
- The sensor value PWM output signal is not received by the PCM.
- The condition exists for at least 2 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.

TEST DESCRIPTION

Step 1 - Step 12:

Step 13 - Step 14:

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the fuel injector control module (FICM) is powered ON. A loss of power or ground to the FICM may set this DTC. A KL6 vehicle may start on gasoline after several seconds.
3. This step determines if the condition is present.
5. This step verifies that the PCM is supplying the correct output voltage. The open circuit voltage should be 5 volts.