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
|
- Turn the ignition ON, with the engine OFF.
- Listen for the automatic level control (ALC) air compressor to activate.
Is the ALC air compressor running for more than 5 minutes?
| Go to
Step 3
| Go to
Step 6
|
3
|
- Turn the ignition OFF.
- Remove the ALC compressor relay.
- Turn the ignition ON, with the engine OFF.
Is the air compressor running?
| Go to
Step 4
| Go to
Step 5
|
4
|
- Turn the ignition OFF.
- Reinstall the ALC compressor relay.
- Repair the short to voltage in the ALC air compressor motor control circuit.
Is the repair complete?
| Go to
Step 13
| --
|
5
|
- Turn the ignition OFF.
- Replace the ALC air compressor relay.
Is the repair complete?
| Go to
Step 13
| --
|
6
| Inspect the left and right rear position sensors for damage and disconnected links.
Are any damaged sensors or disconnected links present?
| Go to
Step 7
| Go to
Step 8
|
7
| Replace the damaged rear position sensor or reconnect the link.
Is the repair complete?
| Go to
Step 13
| --
|
8
|
- Remove the ALC intake filter from the vehicle body. Do not remove it from the ALC air compressor or hose.
- Using the scan tool, cycle ALC air compressor.
- After 1 minute, stop cycling.
- Cycle the ALC exhaust solenoid while checking to see if air is exiting the ALC intake air filter.
Is air exiting the ALC intake air filter?
| Go to
Step 11
| Go to
Step 9
|
9
|
- Disconnect the air tubes from both rear shock absorbers.
- Connect the
J 22124-B
ALC Pressure Gage between both air tubes.
- Open the gage toggle valve.
- Disconnect the air tube from the ALC air dryer.
- Apply shop air to the gage schrader valve.
Is air exiting both of the air tubes at the ALC air dryer connection?
| Go to
Step 10
| Go to
Step 12
|
10
|
- Turn the ignition OFF.
- Replace the ALC air compressor assembly. Refer to
Air Compressor Replacement
.
- Install the ALC intake air filter on the vehicle body.
Are all of the replacements and/or installations complete?
| Go to
Step 13
| --
|
11
|
- Turn the ignition OFF.
- Connect the scan tool.
- Turn the ignition ON with the engine OFF.
- Perform the ESC/ALC recalibration procedure.
Has the recalibration procedure been completed?
| Go to
Step 13
| --
|
12
| Replace the air tube going from the air dryer to both rear shock absorbers. Refer to
Air Tube Replacement
.
Is the repair complete?
| Go to
Step 13
| --
|
13
|
- Turn the ignition OFF.
- Turn the ignition ON with the engine OFF.
- Wait for at least 5 minutes.
Is the rear of the vehicle at trim level?
| Go to
Step 14
| Go to
Step 2
|
14
| Operate the system in order to verify the repair.
Did you correct the condition?
| System OK
| Go to
Step 2
|
