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Home >> Chevrolet >> 2005 >> Optra5 LS, Standard >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Exterior Trim >> Instrument Panel, Gages, And Console >> Diagnostic Information and Procedures >> Engine Coolant Temperature Gage Inaccurate or Inoperative

Engine Coolant Temperature Gage Inaccurate or Inoperative

Step Action Value(s) Yes No
1 Allow the engine to cool to room temperature.
With the ignition ON, does the temperature gage always read at the high end of the scale?		 - Go to Step 7  Go to Step 2 
2 Disconnect the engine control module (ECM) electrical connector.
Does the temperature gage indicator drop to the low end of the scale?		 - Go to Step 3 
3 Inspect for a short to ground between the ECM and the temperature gage. - Go to Step 4  Go to Step 5 
4 Repair the short to ground.
Is the repair complete?		 - System OK -
5 Replace the temperature gage.
Is the repair complete?		 - System OK -
6
  1. Disconnect the ECM.
  2. Turn the ignition ON.
  3. Measure the voltage at the ECM.
Does the voltage measure within the specified range?		 11-14 V Go to Step 9  Go to Step 7 
7 Inspect for an open circuit between the ECM and the temperature gage.
Is there an open circuit?		 - Go to Step 8  Go to Step 5 
8 Repair the open circuit between the ECM and the temperature gage.
Is the repair complete?		 - System OK -
9
  1. Disconnect the ECM.
  2. Connect a jumper wire between the ECM connector and ground.
  3. Turn the ignition ON.
Does the temperature gage move to the high end of the scale?		 - Go to Step 5 
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