GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2001 🢒 Aztek - AWD 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Outside Air Temperature Display Inaccurate or Inoperative

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This step tests for a high resistance in the signal circuit and the ground circuit of the ambient air temperature sensor.

    2.

  2. DTCs may be set in the IPC when you perform this diagnostic table.

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 ON the ignition, 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.

  1. Set the resistance on the J 33431-C Signal Generator and Instrument Panel Tester to 3047 ohms.
  2. Connect the J 33431-C between the ambient air temperature sensor signal circuit and the ground circuit of the ambient air temperature sensor.
  3. Turn ON the ignition, 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 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 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 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 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 Temperature Sensor Replacement .

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 Cluster Replacement .

Did you complete the replacement?

--

Go to Step 10

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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