Test Description
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
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: Engine Controls Connector End Views or Powertrain Control Module (PCM) Connector End Views |
||||
| 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 voltage 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 Intermittent Conditions |
| 9 | Repair the short to ground in the ignition voltage circuit of the fuel injector. Refer to Circuit Testing
in Wiring Systems. Did you complete the repair? |
- | Go to Step 14 | - |
| 10 | Repair the open in the ignition 1 voltage between UBEC and the multi-way connector. Refer to Circuit Testing
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 and/or high resistance, between the multi-way connector and the splice. Refer to Circuit Testing
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 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 |