Diagnostic Aids
WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
- Monitoring the fuel injector circuit status with a scan tool, while moving the fuel injector harness, may help isolate an intermittent condition.
- Performing the Fuel Injector Coil Test may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis (w/CH47976) or Fuel Injector Diagnosis (w/J39021 or w/Tech 2) .
- For an intermittent condition, refer to Intermittent Conditions .
Fuel Injector Circuit Diagnosis
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Is DTC P0201, P0202, P0203, P0204, or P0205 set? | Go to DTC P0201, P0202, P0203, P0204, or P0205 | Go to Step 3 |
| 3 | Inspect the Injectors fuse. Is the 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
. Does the DMM display OL? |
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
. Did you find and correct the condition? |
Go to Step 14 | Go to Intermittent Conditions |
| 9 | Repair the short to ground in the ignition 1 voltage circuit of the fuel injector. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 14 | - |
| 10 | Repair the open in the ignition 1 voltage circuit between the PCM 1 fuse and the multi-way connector. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 14 | - |
| 11 | Repair the open or high resistance in the ignition 1 voltage circuit of the fuel injectors between the multi-way connector and the splice. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 14 | - |
| 12 | Repair the poor connection at the multi-way harness connector. Refer to Connector Repairs
. 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
. 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 |