Diagnostic Aids
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 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:
DTC P2251
| ECM Connector Location | |
|---|---|
| C2 | C1 |
| Front of Vehicle | |
- The front wide band sensors do not toggle or switch like a switching HO2S. The front HO2S signals will be relatively stable for an idling engine.
- Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
- For an intermittent condition, refer to Intermittent Conditions .
- The following table illustrates the typical voltages for the HO2S circuits.
HO2S Voltages
|
|
|---|---|
| HO2S Circuit | Voltage |
| Heater Control | 4.6-5 V |
| Heater Supply Voltage | B+ |
| Reference Voltage | 2.6-3.1 V |
| Low Reference | 2.2-2.7 V |
| Pump Current | Less than 0.5 V |
| Input Pump Current | Less than 0.5 V |