Important: Diagnose the CVRSS DTCs first.

Has the ALC air compressor assembly and the air tube been replaced?

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Go to Step 7

Go to Step 2

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Inspect the air tubes running from the ALC air compressor to both of the rear shock absorbers.
3. Inspect the air tube connection at the ALC air dryer. Refer to Air Tube Replacement .

Are the air tubes damaged or disconnected?

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Go to Step 13

Go to Step 3

Squeeze the left rear shock absorber in the middle of the air sleeve.

Can the air sleeve be slightly compressed?

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Go to Step 5

Go to Step 4

1. Turn the ignition OFF.
2. Connect a scan tool to the DLC.
3. Turn the ignition ON with the engine OFF.
4. Under the SUSPENSION option, activate the ALC air compressor.
5. Operate the ALC air compressor for 60 seconds.
6. Using a soap bubble solution, test the air tube-to-air dryer connection for leaks.

Was a leak found and repaired?

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Go to Step 16

Go to Step 5

1. Turn the ignition OFF.
2. Disconnect the air tube from the ALC air dryer.
3. Connect the J 22124-B adapter and gage to the ALC air dryer.
4. Close the J 22124-B gage toggle valve.
5. Disconnect connector C1 from the CVRSS control module.
6. Turn the ignition ON with the engine OFF.
7. Connect pin C15 of CVRSS connector C1 (harness side) to ground using a jumper wire.

Does the pressure build up to 80 psi?

80 psi

Go to Step 6

Go to Step 10

1. When the pressure reaches 80 psi, shut off the air compressor by removing the jumper from pin C15.
2. Monitor the pressure gage for 1 minute.

Does the pressure leak down?

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Go to Step 10

Go to Step 7

1. Connect J 22124-B adapter tube and gage to the right rear shock absorber. The J 22124-B gage toggle valve should be on the side away from the shock absorber.
2. Close the J 22124-B gage toggle valve.
3. Input shop air into the J 22124-B gage schrader valve until the pressure gage reads 80 psi.
4. Monitor the pressure gage for 1 minute.

Does the pressure leak down?

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Go to Step 11

Go to Step 8

1. Slowly open the J 22124-B gage toggle valve to release air pressure.
2. Disconnect the J 22124-B adapter tube from the right rear shock absorber.
3. Connect the J 22124-B adapter tube with gage to the left rear shock absorber. The J 22124-B gage toggle valve should be on the side away from the shock absorber.
4. Close the J 22124-B gage toggle valve.
5. Input shop air into the J 22124-B gage schrader valve until the pressure gage reads 80 psi.
6. Monitor the pressure gage for 1 minute.

Does the pressure leak down?

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Go to Step 12

Go to Step 9

1. Slowly open the J 22124-B gage toggle valve to release air pressure.
2. Disconnect the J 22124-B adapter tube from the gage and from the left rear shock absorber.
3. Connect the J 22124-B gage to the left rear and right rear air tube connectors.
4. Reconnect the air tube to the ALC air dryer. Refer to Air Tube Replacement .
5. Open the J 22124-B gage toggle valve.
6. Input shop air into the J 22124-B gage schrader valve until the pressure gage reads 80 psi.
7. Monitor the pressure gage for 1 minute.

Does the pressure leak down?

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Go to Step 14

Go to Step 19

1. Replace the ALC air compressor assembly. Refer to Air Compressor Replacement .
2. Replace the air tube. Refer to Air Tube Replacement .

Are the replacements complete?

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Go to Step 19

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1. Replace the right rear shock absorber. Refer to Shock Absorber Replacement in Rear Suspension.
2. Reconnect all the air tube connectors.

Is the shock absorber replaced and are all the air tube connections made?

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Go to Step 19

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1. Slowly open the J 22124-B gage toggle valve to release the air pressure.
2. Replace the left rear shock absorber. Refer to Shock Absorber Replacement in Rear Suspension.
3. Reconnect all of the air tube connectors.

Is the shock absorber replaced and are all of the air tube connections made?

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Go to Step 19

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Are any of the air tubes damaged?

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Go to Step 14

Go to Step 18

Replace the air tube that runs from the air dryer to the two rear shock absorbers. Refer to Air Tube Replacement .

Is the replacement complete?

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Go to Step 15

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1. Remove the ALC dryer from the air compressor assembly. Refer to Automatic Level Control Air Dryer Replacement .
2. Shake the ALC air dryer with the head-connection end down.

Does moisture come out of the ALC air dryer when it is shaken?

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Go to Step 16

Go to Step 17

Replace the ALC air dryer. Refer to Automatic Level Control Air Dryer Replacement .

Is the replacement complete?

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Go to Step 17

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Replace the air compressor head. Refer to Automatic Level Control Air Compressor Head Replacement .

Is the replacement complete?

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Go to Step 18

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1. Install the ALC air compressor assembly on the vehicle. Refer to Air Compressor Replacement .
2. Reconnect all of the air tube connectors.

Have all of the air tubes been reconnected?

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Go to Step 19

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1. Turn the ignition OFF.
2. Reconnect all of the connectors and/or components that were removed.
3. Turn the ignition ON with the engine OFF.
4. Clear the CVRSS DTCs.
5. Wait for at least 5 minutes.

Is the rear of the vehicle trim (level)? Refer to Trim Height in Suspension General Diagnosis.

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System OK

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