Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- Performing the Fuel Injector Coil test may help isolate an intermittent condition. Refer to Fuel Injector Coil Test .
- For an intermittent condition, refer to Intermittent Conditions .
DTC P0201-P0206
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls 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 |
|
Go to Step 3 | Go to Diagnostic Aids |
| 3 |
|
Go to Step 7 | Go to Step 4 |
| 4 | Does the test lamp remain illuminated at all times? | Go to Step 6 | Go to Step 5 |
| 5 | Test the control circuit of the fuel injector for a short to voltage or for an open between the multi-way connector and the PCM. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 14 |
| 6 | Test the control circuit of the fuel injector for a short to ground between the multi-way connector and the PCM. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 17 |
| 7 | Inspect the accessible fuel injector jumper harness between the multi-way connector and the intake manifold for the following:
Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 8 |
| 8 | Probe the appropriate fuel injector control circuit, fuel injector side, at the multi-way connector, with a test lamp that is connected to battery voltage. Refer to Probing Electrical Connectors
in Wiring Systems. Does the test lamp illuminate? |
Go to Step 15 | Go to Step 9 |
| 9 | With a DMM, test for continuity between the ignition 1 voltage circuit terminal and the appropriate fuel injector control circuit terminal, at the multi-way connector. Refer to Testing for Continuity
in Wiring Systems. Does the DMM indicate OL? |
Go to Step 10 | Go to Step 12 |
| 10 | Test the control circuit of the fuel injector for an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 11 |
| 11 | Test the ignition 1 voltage circuit of the fuel injector for an open between the fuel injector and the splice. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 13 |
| 12 | 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
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 16 |
| 13 | Test for an intermittent and for a poor connection at the affected fuel injector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 16 |
| 14 | Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 18 | Go to Step 17 |
| 15 | Repair the short to ground in the fuel injector control circuit. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 18 | - |
| 16 | Replace the appropriate fuel injector. Refer to Fuel Injector Replacement
. Did you complete the replacement? |
Go to Step 18 | - |
| 17 | Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
. Did you complete the replacement? |
Go to Step 18 | - |
| 18 |
|
Go to Step 2 | Go to Step 19 |
| 19 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List | System OK |