P0200

Fuel Injectors 2, 4, 6, And 8:

Fuel Injectors 1, 3, 5, And 7:

Circuit Description
The PCM enables an injector on the intake stroke of each cylinder. Individual cylinder fuel control is referred to as Sequential Multi-port Fuel injection (SFI).

Ignition voltage is supplied directly to the fuel injectors. The PCM controls each injector by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver or control circuit is equipped with a fault line which is monitored by the PCM. When the PCM is commanding an injector ON, the voltage of the control circuit should be low. When the PCM is commanding the injector OFF, the voltage potential of the control circuit should be high. If the PCM detects the injector control circuit voltage other than what is expected, the PCM sets a DTC.

Conditions for Running the DTC
^ The engine speed is greater than 400 RPM.
^ The ignition voltage is greater than 6.0 volts but less than 18.0 volts.

Conditions for Setting the DTC
The PCM detects the wrong voltage potential on any injector driver circuit for 5.0 seconds.

Action Taken When the DTC Sets
^ The PCM illuminates the Malfunction Indicator Lamp on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure records.

Conditions for Clearing the MIL/DTC
^ The PCM turns the MIL OFF after three consecutive ignition cycles that the diagnostic runs and does not fail.
^ A last test failed (current DTC) clears when the diagnostic runs and does not fail.
^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
^ Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Important:
^ Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
^ For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter kit J35616-A. Using this kit prevents damage to the harness/component terminals.
^ The following may cause an intermittent:
- Poor connections.
- Corrosion.
- Mis-routed harness.
- Rubbed through wire insulation.
- Broken wire inside the insulation.
^ When the injector driver is disabled, an engine misfire will be apparent and a misfire DTC sets.
^ Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed.
^ For an intermittent condition, refer to Symptoms. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to step numbers on the diagnostic table.
2. The Misfire current counters will not increment if certain DTCs set at the same time or after DTC P0300 sets. Refer to Conditions for running DTC P0300 for applicable DTC list. If more than one cylinder is misfiring, the Misfire current counters may increment for only one cylinder. Example: Cylinders 1 and 8 are both misfiring, yet only cylinder 8 increments on the Misfire current counter. If one of the injector fuses is open, only two or three Misfire current counters may increment for the corresponding side of the engine.
3. There are two ways to isolate a malfunctioning injector circuit:
^ DTC P0300 indicates a misfire is present. So use the misfire current counters to locate the cylinder that is misfiring.
^ If no misfire DTC is present, Start and idle the engine while monitoring misfire current counters. If a misfire is present, the misfire current counters will increase for a cylinder that has a misfire.
4. The injector fuses also feed the ignition coil/modules. Thoroughly inspect the circuits going to the ignition coil/modules for a short to ground. A shorted ignition coil/module may also cause a fuse to open.
7. Inspect the injector connections before replacing the injector. A faulty connection causes an inoperative injector.
11. Disconnecting the PCM allows using the DMM to test the continuity of the circuits. This aids in locating an open or shorted circuit.