P0200
DTC P0200 Injector Control Circuit
Circuit Description
The powertrain control module (PCM) has four fuel injector driver circuits, each of which controls an fuel injector. The PCM monitors the current in each driver circuit and is able to control the driver circuit. The current through each driver can rise to a peak of 2 amps to quickly open the fuel injectors and can reduce to 1/2 amp to hold the fuel injectors open. This is called peak and hold. If the current cannot reach a 2 amp peak, a DTC is set. This DTC is also set if an fuel injector driver is shorted to voltage.
Conditions for Running the DTC
- Engine is running.
- Battery voltage is more than 9 volts.
Conditions for Setting the DTC
- Injector current is less than 4 amps.
Or
- Injector current is continuously high.
- Above conditions met for 7 seconds.
Action Taken When the DTC Sets
- The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles.
- The control module will set the DTC and records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame/Failure Records.
Conditions for Clearing the MIL/DTC
- The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
- A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22° C (40° F) from the startup coolant temperature and the engine coolant temperature is more than 70° C (158° F) during the same ignition cycle).
- Use the scan tool Clear Information function.
Diagnostic Aids
An injector driver circuit that is open or shorted to voltage will cause a DTC P0200 to set and will also cause a misfire due to an inoperative injector. A misfire DTC should also be set indicating which cylinder is inoperative.
Long Term and Short Term FT that are excessively high or low are a good indication that an injector is malfunctioning. Refer to Fuel Injector Balance Test to check for malfunctioning injectors.
Steps 1 - 2:
Steps 3 - 4:
Steps 5 - 9:
Steps 10 - 14:
Steps 15 - 16:
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
3. This step determines if the DTC P0200 is the result of a hard malfunction or an intermittent condition.
4. This step tests the harness wiring and for the PCM control of the fuel injectors by using a fuel injector test lamp. If the tests lamp blinks, this indicates that the PCM and the wiring to the fuel injectors are OK. Using the Fuel Injector Coil Test will check if the fuel injectors are malfunctioning.
5. Whether the test lamp was ON steady or OFF while cranking the engine, this step narrows the malfunction down to just a few possibilities.
6. Because the test lamp was ON steady, the voltage to the fuel injector is OK, but the fuel injector driver circuit is grounded at all times. This step determines if the circuitry is shorted to ground or if the PCM is malfunctioning.
8. Program the replacement PCM and perform the Crankshaft Position System Variation Learn Procedure. Refer to the latest Techline information for PCM programming.
9. This step determines if the voltage is available to the fuel injector. The voltage is supplied through the fuel pump relay so that the engine must be cranked in order for you to see voltage at the fuel injector.
10. This step determines if the fuel injector driver circuit is open or shorted to voltage or if the PCM is malfunctioning.
11. Since the voltage is supplied to the fuel injector on a single circuit before the fuel injector harness, the malfunction may only be a poor electrical connection or an open in the fuel injector harness. An open before the harness may result in a Cranks But Will Not Run complaint.