GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Jimmy - 2WD 🢒 Brakes 🢒 Antilock Brake System 🢒 Engine Coolant Temperature Gage Inaccurate or Inoperative

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster System Check?

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Go to Step 2

Go to Instrument Cluster System Check

2
  1. Turn the ignition switch to the ON position.
  2. Ensure that the engine is running.
  3. Install the scan tool.
  4. Select the displayed coolant temperature display on the scan tool.
  5. Compare the displayed coolant temperature data on the scan tool to the temperature gauge reading on the cluster.

Are the temperatures approximately equal or within 25°?

87°C

(190°F)

Go to Step 3

Go to Step 6

3

Read the monitored coolant temperature from the scan tool.

Is the monitored coolant temperature reading within the specified range?

38-127°C

100-260°F)

Go to Step 4

Go to Step 5

4

Compare the monitored coolant temperature with the displayed coolant temperature.

Are the temperatures approximately equal or within 11°C (25°F)?

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Go to Step 5

Go to Step 6

5
    • If the monitored coolant temperature is less than 38°C (100°F), the gauge should be at or near the lowest reading.
    • If the monitored coolant temperature is greater than 127°C (260°F), the gauge should be at or near the maximum reading.

Is the gauge reading correct?

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Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 2.2L

Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 4.3L

Go to Step 6

6

Replace the IP cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

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Go to Instrument Cluster System Check

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