For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Inspect the vehicle trim height.
2. Reset the automatic level control (ALC) system by cycling the ignition.
3. Place a 136 kg (300 lb) weight in the rear compartment.
4. Turn the ignition switch to the ON position.
5. Inspect the operation of the rear suspension leveling air compressor.

Does the compressor activate after 25 seconds?

--

Go to Step 2

Go to Step 9

2 | Did the compressor remain active longer than 3 minutes? | -- | Go to Step 3 | Go to Step 4
3 | Refer to the Automatic Level Control System Operation Check for diagnosis. Is the repair complete? | -- | System OK | --
4 | Did the rear of the vehicle return to the original trim height? | -- | Go to Step 6 | Go to Step 5
5 | Refer to Height Sensor Operational Check for diagnosis. Is the repair complete? | -- | System OK | --
6 |

1. Remove the 136 kg (300 lb) weight from the rear compartment.
2. Inspect the operation of the exhaust solenoid valve.

Does the valve activate after 25 seconds?

--

Go to Step 7

Go to Step 9

7 | Inspect the vehicle trim height after 5 minutes. Did the rear of the vehicle return to the original trim height? | -- | Go to Step 9 | Go to Step 8
8 | Refer to Automatic Level Control Compressor Motor Inoperative for diagnosis. Is the repair complete? | -- | System OK | --
9 |

1. Turn the ignition switch to the OFF position.
2. Install the scan tool.
3. Establish communication with the automatic level control (ALC) sensor.

Does the scan tool communicate with the ALC Sensor?

--

Go to Step 11

Go to Step 10

10 | Go to Scan Tool Does Not Communicate with Automatic Level Control Sensor in Data Link Communications for diagnosis. Is the repair complete? | -- | System OK | --
11 | Are any current DTCs displayed? | -- | Go to Step 12 | Go to Step 13
12 | Refer to the Diagnostic Trouble Code (DTC) List/Type for the applicable DTC diagnosis. Is the repair complete? | -- | System OK | --
13 | Are any history or intermittent DTCs displayed? | -- | Go to Step 14 | System OK
14 |

1. There is an intermittent condition within the system.
2. Refer to Diagnostic Aids relating to the DTC for diagnosis.

Is the repair complete?

--

System OK

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