P0204

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Engine Controls Schematics: Power, Ground, And Fuel Injectors:

CIRCUIT DESCRIPTION
The PCM controls the fuel injector control circuit using a Multi Function Driver (MFD). The MFD has the ability to detect an electrical malfunction. If an electrical malfunction is detected, the MFD signals the PCM to set this DTC.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
^ An incorrect voltage level is being detected on an injector driver circuit.
^ The above condition is met for more than 30 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
^ If the misfire is determined to be catalyst damaging, the PCM will flash the MIL.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
^ The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
Inspect for the following conditions:

IMPORTANT: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

^ Faulty terminal connections
Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal-to-wire connections. Use a corresponding mating terminal in order to test for proper tension. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Diagrams.
^ Damaged harness
Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving the connectors and the wiring harnesses that are related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Circuit Testing and Wiring Repairs in Diagrams.
^ Inspect the PCM and the engine grounds for clean and secure connections.

If the DTC is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
4. If the scan tool indicates STUCK HIGH there is a short to battery positive voltage on the fuel injector control circuit.
5. If the scan tool indicates STUCK LOW there is an open or a short to ground on the fuel injector control circuit.
6. When the multiple-way connector is disconnected, other DTCs will be set. These DTCs should be disregarded.
If the scan tool indicates a STUCK HIGH while cranking, the short to battery positive voltage is between the multiple-way connector and the PCM. If the scan tool indicates STUCK LOW while cranking the short to battery positive voltage is between the multiple-way connector and the fuel injector.

IMPORTANT: While cranking the engine with the multiple-way connector disconnected, all of the other injector circuits should indicate STUCK LOW. This is a fault induced by disconnecting this connector. The circuits will resume correct operation when the connector is reconnected.

9. This step is testing for a short to ground in the circuit.
10. The fuel injector in this circuit will need to be tested after the short to ground is repaired or after the PCM is replaced.
11. This step is testing the function of the PCM. If the test lamp flashes then the PCM is able to supply the ground.
14. This vehicle is equipped with a PCM which utilizes an Electronically Erasable Programmable Read Only Memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.