P0204

CIRCUIT DESCRIPTION

Schematic:

The fuel injector is a solenoid operated device. The fuel injectors receive 12 volts from the ignition through a fuse. The PCM provides the ground path for each injector through individual driver circuits. The PCM monitors the circuits for proper voltage levels. When an improper voltage level occurs, the driver signals the PCM. If the PCM detects an improper voltage level in the fuel injector circuit for cylinder #4, DTC P0204 will set.

CONDITIONS FOR RUNNING THE DTC
^ No system voltage DTCs are set.
^ System voltage between 11-16 volts.

CONDITIONS FOR SETTING THE DTC
The PCM detects an improper voltage level in the fuel injector circuit for cylinder #4.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) the first time the malfunction is detected.
^ The PCM stores the conditions present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM turns the MIL OFF after three consecutive drive trips during which the diagnostic runs and passes.
^ 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 DTC Information function.

DIAGNOSTIC AIDS
If the condition is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions

TEST DESCRIPTION

Steps 1 - 8:

Steps 9 - 17:

The numbers below refer to the step numbers in the diagnostic table.
4. If DTCs P0201, P0206, and P0207 are not set, then the malfunction is isolated to fuel injector #4.
5. This determines if the circuit is shorted. An open ignition feed circuit or a faulty splice is indicated if the DTCs are set and the fuse is OK.
6. This step determines whether the ignition feed or the fuel injector is shorted.
8. This step helps to detect a short to voltage on the fuel injector control circuit.
9. This step helps to locate an open or short to ground in the fuel injector control circuit.
10. This step determines whether the fuel injector is open or if poor terminal contact exists.
16. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.