Diagnostic Aids
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The following table illustrates the ECM connector locations:
| ECM Connector Location | |
|---|---|
| X2 | X1 |
| Front of Vehicle | |
- The front wide band sensor does not toggle or switch like a switching HO2S. The front HO2S signal will be relatively stable for an idling engine.
- The following table illustrates the typical voltages for the HO2S circuits:
| HO2S Circuit | Voltage |
|---|---|
|
|
| Heater Control | 4.6-5.0 V |
| Heater Supply Voltage | B+ |
| High Signal | 2.6-3.1 V |
| Low Signal | 2.2-2.7 V |
| Pump Current | Less than 0.5 V |
| Input Pump Current | Less than 0.5 V |