P0204

Diagnostic Chart:

Wiring Diagram:

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. It an electrical malfunction is detected, the MFD signals the PCM to set DTC P0204.

CONDITIONS FOR SETTING THE DTC

^ An incorrect voltage level is being detected on an injector driver circuit.

^ Above condition for over 30 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the first trip in which the diagnostic runs and fails.

^ It equipped with traction control, the PCM will command the Electronic Brake and Traction Control Module (EBTCM) via serial data (CKT 800) to turn OFF traction control and illuminate the TRACTION OFF lamp.

^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM will turn the MIL OFF 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 the scan tool Clear Info function or by disconnecting the PCM battery feed.

DIAGNOSTIC AIDS

Monitor the injector fault parameter in the scan tool. Wiggle the electrical harnesses for the effected electrical circuit. If the status changes on the scan tool, that may be an indicator where an intermittent fault may be located.

Check for the following conditions:

^ Poor connection at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

^ Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the display on the scan tool while moving connectors and wiring harnesses related to the circuit

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

TEST DESCRIPTION

The number(s) below refer to the step number(s) on the diagnostic table.

4. If the scan tool indicates STUCK HIGH there is a short to battery positive voltage on the fuel injector driver circuit.

5. If the scan tool indicates STUCK LOW there is an open or a short to ground on the fuel injector driver circuit.

6. When the 10-way fuel injector connector is disconnected, DTCs P0107 and P1107 will be set. There DTCs should be disregarded.

If the scan tool indicates a STUCK HIGH while cranking, the short to battery positive voltage is between the 10-way connector and the PCM. If the scan tool indicates STUCK LOW while cranking the short to battery positive voltage is between the 10-way connector and the fuel injector.

Important: While cranking the engine with the 10-way fuel injector connector disconnected, all of the other injector circuits will indicate STUCK LOW, this is a fault induced by disconnecting the 10-way. They will resume correct operation when the 10-way connector is reconnected.

10. This step is checking for a short to ground in the circuit.

11. The fuel injector in this circuit will need to be checked after the short to ground is repaired or after the PCM is replaced.

12. This step is checking the function of the PCM. If the test lamp flashes then the PCM is able to supply the ground.

15. This vehicle is equipped with a PCM which utilizes an Electronically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed. Refer to PCM Replacement/Programming.