Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 4: This step tests for a short to ground on the ignition 1 voltage supply circuit of the fuel injector.
- 5: This step tests for a short to a PCM ground on the ignition 1 voltage supply circuit of the fuel injector.
- 6: This step tests for an open between the multi-way connector and the fuel injectors.
- 7: This step tests for an open or high resistance between the multi-way connector and the fuel injectors.
Fuel Injector Circuit Diagnosis
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Inline Harness Connector End Views in Wiring Systems, Engine Controls Component Views , or Powertrain Control Module (PCM) Connector End Views |
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| 1 | Did you perform the Diagnostic System Check-Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 | Are any fuel injector DTCs set? | - | Go to DTC P0201-P0206 | Go to Step 3 |
| 3 | Inspect the fuel injector fuse. Is the fuel injector fuse open? |
- | Go to Step 4 | Go to Step 6 |
| 4 |
|
- | Go to Step 9 | Go to Step 5 |
| 5 | Turn ON the ignition, with the engine OFF. Does the test lamp illuminate? |
- | Go to Step 13 | Go to Step 8 |
| 6 |
|
- | Go to Step 7 | Go to Step 10 |
| 7 | Test for continuity between the ignition 1 voltage circuit terminal and a fuel injector terminal, at the multi-way harness connector, fuel injector side. Refer to Testing for Continuity
in Wiring Systems. Does the DMM display a resistance above the specified value? |
5 Ω | Go to Step 11 | Go to Step 12 |
| 8 | Test the ignition 1 voltage circuit of the fuel injector, between the multi-way harness connector and 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 14 | Go to Diagnostic Aids |
| 9 | Repair the short to ground in the ignition 1 voltage circuit of the fuel injector. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 14 | - |
| 10 | Repair the open in the ignition 1 voltage circuit between the UBEC and the multi-way connector. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 14 | - |
| 11 | Repair the ignition 1 voltage circuit of the fuel injectors for an open/high resistance, between the multi-way connector and the splice. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 14 | - |
| 12 | Repair the poor connection at the multi-way connector. Refer to Connector Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 14 | - |
| 13 | Repair the short to a PCM ground in the ignition 1 voltage circuit of the fuel injector. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 14 | - |
| 14 | Operate the system in order to verify the repair. Did you correct the condition? |
- | System OK | Go to Step 3 |