Diagnostic Aids
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
In order to avoid a misdiagnosis, inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
DTC P1574
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference : Cruise Control Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views in Engine Controls - 3.8 L (L26 and L32) |
|||
| 1 | Did you perform the Cruise Control Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Cruise Control |
| 2 | Is DTC P0573 current in the PCM? | Go to DTC P0573 in Lighting Systems | Go to Step 3 |
| 3 | Do the stop lamps operate properly? | Go to Step 4 | Go to Stop Lamps Inoperative in Lighting Systems |
| 4 |
|
Go to Step 5 | Go to Diagnostic Aids |
| 5 | Test the stop lamp switch signal circuit for an open or for a high resistance. Refer to Circuit Testing
and to Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 8 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections
and to Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 8 | Go to Step 7 |
| 7 | Replace the TAC module. Refer to Throttle Body Assembly Replacement (L26)Throttle Body Assembly Replacement (L32)
in Engine Controls - 3.8L (L26 and L32). Did you complete the replacement? |
Go to Step 8 | - |
| 8 |
|
Go to Step 2 | System OK |