Engine Coolant Temperature Gage Inaccurate or Inoperative. Saturn ION 2007

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2007 🢒 ION 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Engine Coolant Temperature Gage Inaccurate or Inoperative

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the powertrain control module (PCM) or the engine control module (ECM). The IPC receives a serial data message from the PCM/ECM indicating the engine coolant temperature. The IPC uses the PCM/ECM coolant temperature information to determine the coolant temperature gage display.

Reference Information

Schematic Reference

•	Instrument Cluster Schematics

•	Engine Controls Schematics for the 2.0L engine

•	Engine Controls Schematics for the 2.2L engine

•	Engine Controls Schematics for the 2.4L engine

Connector End View Reference

•	Displays and Gages Connector End Views

•	Powertrain Control Module Connector End Views for the 2.0L engine

•	Engine Control Module Connector End Views for the 2.2L engine

•	Engine Control Module Connector End Views for the 2.4L engine

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

Ignition ON, scan tool installed, perform the instrument panel cluster (IPC) scan tool Special Functions Lamp and Gage Check.

⇒	If the engine coolant temperature gage does not sweep from its low to high position, replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming