P0200

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The Powertrain Control Module (PCM) has four injector driver circuits, each of which controls an injector. The PCM monitors the current in each driver circuit by measuring a voltage drop through a fixed resistor and is able to control the driver circuit. The current through each driver can rise to a peak of 4 amps to quickly open the injectors and can reduce to 1 amp to hold the injectors open. This is called peak and hold. If the current cannot reach a 4 amp peak, a DTC is set. This DTC is also set it an injector driver is shorted to voltage.

CONDITIONS FOR SETTING THE DTC

^ Injector current is less than 4 amps.

^ Battery voltage is more than 9 volts.

^ Above conditions met for 7 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The Malfunction Indicator Lamp (MIL) illuminates.

^ The PCM records the operating conditions at the time when the diagnostic fails. This information stores in the Freeze Frame and Failure Records buffers.

^ A history DTC stores.

^ The coolant fan turns ON.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The MIL will turn OFF after three consecutive ignition cycles in which the diagnostic runs without a fault.

^ A history DTC will clear after 40 consecutive warm up cycles without a fault.

^ The MIL/DTC(s) can be cleared by using the scan tool.

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 fuel trims that are excessively high or low are a good indication that an injector is malfunctioning. Use Fuel Inj Coil Test - Engine Coolant Temperature (ECT) Between 10-35 Degrees C to check for malfunctioning injectors.

TEST DESCRIPTION

The number(s) below refer(s) to the step number(s) on the Diagnostic Table.

1. The Powertrain OBD System Check prompts you to complete some of the basic checks and to store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data captured when the malfunction occurred. The scan tool stores this data on the scan tool for later reference.

3. This step determines if the DTC P0200 is the result to a hard malfunction or an intermittent condition.

5. This step tests the harness wiring and for the PCM control of the fuel injectors by using the test light J 34780-2. If the tests light blinks, this indicates that the PCM and the wiring to the fuel injectors are OK. Fuel In] Coil Test - ECT Between 10-35 Degrees C will check if the fuel injectors are malfunctioning.

6. Whether the test light was ON steady or OFF while cranking the engine, this step narrows the malfunction down to just a few possibilities.

7. Because the test light 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.

9. Reprogram the replacement PCM and perform the crankshaft position system variation learning procedure. Refer to the latest Techline information for PCM programming and Crankshaft Position (CKP) System Variation Learn Procedure for the Crankshaft Position System Variation Procedure.

10. 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 injector.

11. This step determines if the fuel injector driver circuit is open or shorted to voltage or if the PCM is malfunctioning.

12. Since the voltage is supplied to the injector on a single circuit before the injector harness, the malfunction could only be a poor connection or an open in the injector harness. An open before the harness would result in a Cranks But Will Not Run complaint.

13. Check the fuel injector electrical connector, the fuel injector harness connector and the PCM for poor connections or corroded terminals.