GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2006 🢒 Montana SV6 🢒 DTC 🢒 DTC 023

Circuit Description

The automatic level control sensor monitors for excessive compressor activity and the compressor is limited to 255 seconds for a leveling function.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC 023 Excessive Compressor Activity

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

This DTC is set when the automatic level control sensor detects the compressor has been running for 255 seconds during a leveling function.

Action Taken When the DTC Sets
    • The automatic level control sensor disables the leveling functions.
    • The automatic level control sensor disables inflator functions.

Conditions for Clearing the DTC

The conditions that caused the DTC to set have been removed.

Diagnostic Aids
    • An AIR LEAK in the system will cause this DTC to set.
    • If the rod is disconnected, DTC 033 will be set.

Test Description

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

  1. This step tests for battery positive voltage at the level control compressor relay. The ELC fuse supplies power to the level control compressor relay.

    2.

  2. This step verifies that the level control compressor relay contacts are working.

    3.

  3. This step tests the ground circuit for the compressor motor.

    4.

  4. This step verifies that the level control compressor relay is replaced.

Step

Action

Yes

No

Schematic Reference: Automatic Level Control Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Check all air lines and exhaust valves for air leakage.
  2. Check both rear shock absorbers for air leakage.

Did you find and correct the condition?

Go to Step 11

Go to Step 3

3

  1. Turn ON the ignition.
  2. Disconnect the level control compressor relay.
  3. Probe the battery positive voltage circuit of the level control compressor relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 8

4

  1. Connect a test lamp between the battery positive output circuit of the level control compressor relay and the compressor motor ground circuit.
  2. With the accessory inflator switch, command the accessory inflator valve ON and OFF.

Does the test lamp turn ON and OFF with each command?

Go to Step 6

Go to Step 5

5

Test the ground circuit of the compressor motor for a open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Inspect for poor connections at the compressor motor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 9

7

Inspect for poor connections at the harness connector of the level control compressor relay. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 10

8

Repair the battery positive voltage circuit of the level control compressor relay coil. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 11

--

9

Replace the compressor motor. Refer to Air Compressor Replacement .

Did you complete the replacement?

Go to Step 11

--

10

Replace the level control compressor relay. Refer to Automatic Level Control Relay Replacement .

Did you complete the replacement?

Go to Step 11

--

11

Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK