Test Description
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.
DTC P1633
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Starting and Charging Schematics Connector End View Reference: Engine Electrical Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Engine Electrical? | Go to Step 2 | Go to Diagnostic System Check - Engine Electrical |
| 2 | Does the engine run with the ignition OFF? | Go to Step 6 | Go to Step 3 |
| 3 | Are DTCs P0740, P0753, P0785, or P1860 also set? | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 4 |
| 4 | 1. Turn OFF the ignition. 2. Disconnect the powertrain control module (PCM). 3. Connect a test lamp between the ignition 0 voltage circuit and a good ground. 4. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate? |
Go to Step 7 | Go to Step 5 |
| 5 | Test the ignition 0 voltage circuit for an open between the splice and the PCM. Refer to TESTING FOR CONTINUITY
and CIRCUIT TESTING
in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | - |
| 6 | 1. Disconnect the PCM. 2. Test both ignition 1 voltage circuits for a short to voltage. Refer to TESTING FOR A SHORT TO VOLTAGE and in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | - |
| 7 | Test for an intermittent and for poor connection at the PCM. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS
and in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 8 |
| 8 | Replace the PCM. Refer to POWERTRAIN CONTROL MODULE (PCM) REPLACEMENT
. Did you complete the replacement? |
Go to Step 9 | - |
| 9 | 1. Clear the DTCs with a scan tool. 2. Turn OFF the ignition for 30 seconds. 3. Start the engine. 4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? |
Go to Step 2 | Go to Step 10 |
| 10 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
Go to DTC INDEX | System OK |