Test Description

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Test numbers refer to numbers on diagnostic chart.

Determines if conditions necessary to set code exist.
This test will determine if signal circuit is shorted to ground which will cause conditions for Code P0118.
This test will determine if sensor circuits are open. If circuits are okay, check connections at PCM and ECT sensor.

Fig 1: Code P0118 Schematic (3.8L) Coolant Temperature Sensor High Temperature Indicated

Fig 2: Code P0118 Flow Chart (3.8L) Coolant Temperature Sensor High Temperature Indicated