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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

An engine that soaks for about 8 hours will help diagnosis the condition. After the cold soak, operate the vehicle at highway speeds for 20 minutes while monitoring the Calculated ECT-Thermostat parameter with a scan tool. If there is a condition, the calculated temperature will be 10°C (18°F) greater than the actual engine coolant temperature.

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