Test Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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 isolates the circuit between the multi-way connector and the underhood bussed electrical center (UBEC). A short to ground will open the fuel injector fuse.
- 7: This step tests if a ground is constantly being applied to the fuel injector.
- 9: This step isolates the circuit between the multi-way connector and the ECM. An open or short to voltage on the fuel injector control circuit will not allow the test lamp to blink.
- 11: This step inspects for fuel injector harness damage between the multi-way connector and the upper intake manifold. Careful inspection may isolate the condition before the removal of the upper intake manifold.
- 16: This step isolates the circuit between the multi-way connector and the fuel injector. A short to voltage on the fuel injector control circuit will set this DTC.
DTC P0201-P0206
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 6 |
| 3 | Inspect the fuel injector fuse in the underhood bussed electrical center (UBEC). Is the fuse open? |
Go to Step 4 | Go to Step 5 |
| 4 |
|
Go to Step 20 | Go to Step 18 |
| 5 |
|
Go to Step 18 | Go to Step 19 |
| 6 |
|
Go to Step 7 | Go to Diagnostic Aids |
| 7 |
|
Go to Step 11 | Go to Step 8 |
| 8 | Does the test lamp remain illuminated at all times? | Go to Step 10 | Go to Step 9 |
| 9 | Test the control circuit of the fuel injector for a short to voltage or an open between the multi-way connector and the ECM. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 24 | Go to Step 17 |
| 10 | Test the control circuit of the fuel injector for a short to ground between the multi-way connector and the ECM. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 24 | Go to Step 23 |
| 11 | Inspect the accessible fuel injector jumper harness between the multi-way connector and the plenum for the following conditions:
Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? |
Go to Step 24 | Go to Step 12 |
| 12 |
|
Go to Step 21 | Go to Step 13 |
| 13 | Test for continuity between the ignition voltage terminal and the appropriate fuel injector control circuit terminal, at the multi-way connector, with a DMM. Refer to Testing for Continuity
. Does the DMM indicate OL? |
Go to Step 14 | Go to Step 16 |
| 14 | Test the control circuit of the fuel injector for an open or poor connections at the fuel injector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 24 | Go to Step 15 |
| 15 | Test the ignition voltage circuit of the fuel injector for an open between the fuel injector and the splice. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 24 | Go to Step 22 |
| 16 | Test the control circuit of the fuel injector for a short to voltage or a short to another circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 24 | Go to Step 22 |
| 17 | Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 24 | Go to Step 23 |
| 18 | Repair the open or short to ground in the ignition 1 voltage circuit between the multi-way connector and the splice. Did you complete the repair? |
Go to Step 24 | - |
| 19 | Repair the open in the ignition 1 voltage circuit between the multi-way connector and the UBEC. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 24 | - |
| 20 | Repair the short to ground in the ignition 1 voltage circuit between the multi-way connector and the UBEC. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 24 | - |
| 21 | Repair the short to ground in the fuel injector control circuit. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 24 | - |
| 22 | Replace the appropriate fuel injector. Refer to Fuel Injector Replacement. Did you complete the replacement? |
Go to Step 24 | - |
| 23 | Replace the ECM. Refer to Control Module References
for replacement, setup and programming. Did you complete the replacement? |
Go to Step 24 | - |
| 24 |
|
Go to Step 2 | Go to Step 25 |
| 25 | 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 |