Test Description
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. 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.
- 2: This step isolates the ignition 1 voltage circuit. An open or short to ground in this circuit sets all fuel injector DTCs.
- 4: This step verifies that the PCM is able to control the fuel injector. If the test lamp flashes, the PCM and wiring are OK.
- 5: This step tests if a ground is constantly being applied to the fuel injector.
DTC P0201-P0206
| Step | Action | 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 - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Step 3 | Go to Step 5 |
| 3 | Inspect the fuel injector fuse in the underhood bussed electrical center (UBEC). Is the fuse open? |
Go to Step 11 | Go to Step 8 |
| 4 |
|
Go to Step 9 | Go to Step 5 |
| 5 | Does the J 34730-405 remain illuminated at all times? | Go to Step 7 | Go to Step 6 |
| 6 | Test the control circuit of the fuel injector for a short to voltage or an open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 10 |
| 7 | Test the control circuit of the fuel injector 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 Step 13 |
| 8 | Test the ignition voltage supply circuit for an open between the UBEC and splice. Did you find and correct the condition? |
Go to Step 11 | - |
| 9 | Inspect for poor connections at the harness connector of the fuel injector. Refer to Testing for Intermittent Conditions and Poor Connections
and Repairing Connector Terminals
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 12 |
| 10 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Repairing Connector Terminals
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 13 |
| 11 |
|
Go to Step 14 | - |
| 12 | Replace the fuel injector. Refer to Fuel Injector Replacement
. Did you complete the replacement? |
Go to Step 14 | - |
| 13 | Replace the PCM. Refer to Control Module References
for replacement, setup and programming. Did you complete the replacement? |
Go to Step 14 | - |
| 14 |
|
Go to Step 15 | Go to Step 2 |
| 15 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK |