P0203

DTC P0203

CIRCUIT DESCRIPTION
The powertrain control module (PCM) enables the appropriate fuel injector for each cylinder. A voltage is supplied directly to the fuel injectors. The PCM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The PCM monitors the status of each driver. If the PCM detects an incorrect voltage for the commanded state of the driver, a fuel injector control DTC P0201-P0206 sets.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC P0201 Injector 1 Control Circuit
- DTC P0202 Injector 2 Control Circuit
- DTC P0203 Injector 3 Control Circuit
- DTC P0204 Injector 4 Control Circuit
- DTC P0205 Injector 5 Control Circuit
- DTC P0206 Injector 6 Control Circuit

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The ignition voltage is between 9-18 volts.

CONDITIONS FOR SETTING THE DTC
- The PCM detects an incorrect voltage on the fuel injector control circuit.
- The condition exists for 3 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the 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
- A cylinder that is misfiring can also cause the misfire current counters to increment for another cylinder. Diagnose the cylinder with the highest level of misfire first.
- Performing the Fuel Injector Coil test may help to isolate an intermittent condition. Refer to Fuel Injector Coil Test.
- If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

TEST DESCRIPTION

Step 1 - Step 10:

Step 11 - Step 23:

Step 24 - Step 25:

The numbers below refer to the step numbers on the diagnostic table.
2. This step isolates the ignition 1 voltage circuit. An open or short to ground in this circuit sets all fuel injector DTCs.
4. This step isolates the circuit between the multi-way connector and the underhood bussed electrical center (UBEC). A short to ground will open the fuel injector fuse.
7. This step tests if a ground is constantly being applied to the fuel injector.
9. This step isolates the circuit between the multi-way connector and the PCM. An open or short to voltage on the fuel injector control circuit will not allow the test lamp to blink.
11. This step inspects for fuel injector harness damage between the multi-way connector and the upper intake manifold. Careful inspection may isolate the condition before the removal of the upper intake manifold.
16. This step isolates the circuit between the multi-way connector and the fuel injector. A short to voltage on the fuel injector control circuit will set this DTC.