Circuit Description
The powertrain control module (PCM) enables the appropriate fuel injector on the intake stroke for each cylinder. A voltage is supplied directly to the fuel injectors. The PCM controls each fuel injector by grounding the control circuit via a solid state device called a driver.
Diagnostic Aids
| • | Monitoring the fuel injector circuit status with a scan tool, while moving the fuel injector harness, may help to isolate an intermittent condition. |
| • | Performing the Fuel Injector Coil Test may help isolate an intermittent condition. Refer to Fuel Injector Solenoid Coil Test . |
| • | For an intermittent condition, refer to Intermittent Conditions . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests for a short to ground on the ignition 1 voltage supply circuit of the fuel injector.
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This step tests for a short to a PCM ground on the ignition 1 voltage supply circuit of the fuel injector.
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This step tests for an open ignition 1 voltage supply circuit between the ECM 1 fuse and the multi-way connector.
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This step tests for high resistance between the ECM 1 fuse and the multi-way connector.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |
2 | Is DTC P0200 set? | -- | Go to DTC P0200 | Go to Step 3 |
3 | Inspect the ECM 1 fuse. Is the ECM 1 fuse open? | -- | Go to Step 4 | Go to Step 6 |
Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 5 | |
Turn ON the ignition, with the engine OFF. Does the test lamp illuminate? | -- | Go to Step 11 | Go to Diagnostic Aids | |
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 9 | |
Test for continuity between the ECM 1 fuse and an ignition 1 voltage supply terminal of a fuel injector. Refer to Testing for Continuity in Wiring Systems. Does the DMM display a resistance above the specified value? | 5 ohms | Go to Step 10 | Go to Intermittent Conditions | |
8 | Test the ignition 1 voltage supply circuit of the fuel injectors for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | -- |
9 | Repair the open in the ignition 1 voltage supply circuit of the fuel injectors. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 12 | -- |
10 | Repair the high resistance in the ignition 1 voltage supply circuit of the fuel injectors. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 12 | -- |
11 | Repair the short to a PCM ground in the ignition 1 voltage supply circuit of the fuel injectors. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 12 | -- |
12 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
