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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1091 (Instrument Panel System Displays, Gauges And Console) >> Diagnostic Information and Procedures >> Outside Air Temperature Display Inaccurate or Inoperative >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests for a high resistance in the signal circuit and the ground circuit of the ambient air temperature sensor.
  2. 10:  DTCs may be set in the IPC when you perform this diagnostic table.
Outside Air Temperature Display Inaccurate or Inoperative

Step Action Value(s) Yes No
Schematic Reference:  Instrument Cluster Schematics  
1 Did you perform the Instrument Panel Cluster Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2
  1. Turn the ignition ON, with the engine OFF.
  2. Set the DIC to the compass/temperature display.
Does the temperature displayed on the DIC match the current room temperature within 3°F (2°C)?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
    IMPORTANT: Verify the J 33431-C  resistance settings with a DMM. See Special Tools and Equipment .
  1. Set the resistance on the J 33431-C  Signal Generator and Instrument Panel Tester to 3047 Ω. See Special Tools and Equipment .
  2. Connect the J 33431-C  between the signal circuit of the ambient air temperature sensor and the ground circuit of the ambient air temperature sensor. See Special Tools and Equipment .
  3. Turn the ignition ON, with the engine OFF.
Does the DIC display the specified value?		 54°C (130°F) Go to Step 6  Go to Step 4 
4 Test the ambient air temperature sensor signal circuit for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 5 
5 Test the ground circuit of the ambient air temperature sensor for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
6 Inspect for poor connections at the harness connector of the ambient air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8 Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Gage Sensor Replacement (Aztek)  or Ambient Air Temperature Gage Sensor Replacement (Rendezvous) .
Did you complete the replacement?		 - Go to Step 10  -
9
IMPORTANT: Perform the compass calibration and variance procedure on the replacement IPC.
Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement .Did you complete the replacement?		 - Go to Step 10  -
10 
  1. Use the scan tool in order to clear the IPC DTCs.
  2. Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
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