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 | |
- Test the ECT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a DTC or a driveability condition. Refer to Temperature Versus Resistance - Engine Coolant Temperature Sensor .
- If the vehicle has sat overnight, the IAT sensor and the ECT sensor values should display within 3°C (5°F).
- After starting a cold engine, the ECT sensor temperature should rise steadily, then stabilize after the thermostat opens.
- High resistance in the circuits of either the ECT or IAT sensor could set a DTC.