Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for voltage at the coil side of the accessory inflator valve. The ELC relay fuse supplies power to the coil side of the accessory inflator valve.
- 3: This step verifies that the height sensor is providing ground to the accessory inflator valve.
- 4: This step tests if ground is constantly being applied to the accessory inflator valve.
- 9: This step verifies that the automatic level control sensor is self tested after replacement.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Turn ON the ignition. Disconnect the accessory inflator valve. Probe the battery positive voltage circuit of the accessory inflator valve with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 3 | Go to Step 7 |
| 3 | Connect a test lamp between the control circuit of the accessory inflator valve and the battery positive voltage circuit of the accessory inflator valve. 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 5 | Go to Step 4 |
| 4 | Test the control circuit of the accessory inflator valve for the following conditions: A ground An open Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
| 5 | Inspect for poor connections at the accessory inflator valve. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 6 | Inspect for poor connections at the harness connector of the height sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 7 | Repair the battery positive voltage circuit of the accessory inflator valve. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 10 | |
| 8 | Replace the accessory inflator valve. Refer to Inflator Solenoid Replacement . Did you complete the replacement? | Go to Step 10 | |
| 9 | IMPORTANT: System untested code will continue to flash until Self test has been completed after automatic level control sensor replacement. Replace the automatic level control sensor. Refer to Automatic Level Control Sensor Replacement .Did you complete the replacement? | Go to Step 10 | |
| 10 | 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 |
| IMPORTANT |
|---|
| System untested code will continue to flash until Self test has been completed after automatic level control sensor replacement. |
DTC 011
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for mechanical damage to automatic level control sensor link.
- 3: Automatic level control sensor replacement.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Inspect the automatic level control sensor link for damage or being disconnected. Did you find and correct the condition? | Go to Step 4 | Go to Step 3 |
| 3 | Replace the automatic level control sensor. Refer to Automatic Level Control Sensor Replacement . Did you complete the replacement? | Go to Step 4 | |
| 4 | 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 |
DTC 013
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for short to ground in compressor relay control circuit.
- 3: This step verifies that the automatic level control sensor is self tested after replacement.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Test the control circuit of the compressor relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 3 |
| 3 | IMPORTANT: System untested codes will continue to flash until the self test has been completed after automatic level control sensor replacement. Replace the automatic level control sensor. Refer to Automatic Level Control Sensor Replacement .Did you complete the replacement? | Go to Step 4 | |
| 4 | 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 |
| IMPORTANT |
|---|
| System untested codes will continue to flash until the self test has been completed after automatic level control sensor replacement. |
DTC 021
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for battery positive voltage at the relay coil. The ELC fuse supplies power to the relay coil of the level control compressor relay.
- 3: This step verifies that the automatic level control sensor is providing ground to the level control compressor relay.
- 4: This step tests if battery positive voltage is constantly being applied to the level control compressor relay control circuit or the circuit is open.
- 9: This step verifies that the automatic level control sensor is self tested after replacement.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Turn ON the ignition. Disconnect the level control compressor relay. 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 3 | Go to Step 7 |
| 3 | Connect a test lamp between the coil control circuit of the level control compressor relay and the battery positive voltage circuit of the level control compressor relay. 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 5 | Go to Step 4 |
| 4 | Test the control circuit of the level control compressor relay for a short to voltage, ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
| 5 | Inspect for poor connections at the level control compressor relay. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 6 | Inspect for poor connections at the harness connector of the automatic level control sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 7 | Repair the battery positive voltage circuit of the level control compressor relay coil. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 10 | |
| 8 | Replace the level control compressor relay. Refer to Automatic Level Control Relay Replacement . Did you complete the replacement? | Go to Step 10 | |
| 9 | IMPORTANT: System untested codes will continue to flash until self test has been completed after automatic level control sensor replacement. Replace the automatic level control sensor. Refer to Automatic Level Control Sensor Replacement .Did you complete the replacement? | Go to Step 10 | |
| 10 | 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 |
| IMPORTANT |
|---|
| System untested codes will continue to flash until self test has been completed after automatic level control sensor replacement. |
DTC 022
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step tests for battery positive voltage at the level control compressor relay. The ELC fuse supplies power to the level control compressor relay.
- 4: This step verifies that the level control compressor relay contacts are working.
- 5: This step tests the ground circuit for the compressor motor.
- 10: This step verifies that the level control compressor relay is replaced.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Check all air lines and exhaust valves for air leakage. Check both rear shock absorbers for air leakage. Did you find and correct the condition? | Go to Step 11 | Go to Step 3 |
| 3 | Turn ON the ignition. Disconnect the level control compressor relay. 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 | Connect a test lamp between the battery positive output circuit of the level control compressor relay and the compressor motor ground circuit. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 |
DTC 023
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for voltage at the coil side of the exhaust valve. The ELC fuse supplies power to the coil side of the exhaust valve.
- 3: This step verifies that the automatic level control sensor is providing ground to the exhaust valve.
- 4: This step tests if ground is constantly being applied to the exhaust valve.
- 9: This step verifies that the automatic level control sensor is self tested after replacement.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Turn ON the ignition. Disconnect the exhaust valve. Probe the battery positive voltage circuit of the exhaust valve with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 3 | Go to Step 7 |
| 3 | Connect a test lamp between the control circuit of the exhaust valve and the battery positive voltage circuit of the exhaust valve. Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
| 4 | Test the control circuit of the exhaust valve for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
| 5 | Inspect for poor connections at the exhaust valve. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 6 | Inspect for poor connections at the harness connector of the automatic level control sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 7 | Repair the battery positive voltage circuit of the exhaust valve. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 10 | |
| 8 | Replace the exhaust valve. Refer to Air Compressor Replacement . Did you complete the replacement? | Go to Step 10 | |
| 9 | IMPORTANT: System untested codes will continue to flash until self test has been completed after automatic level control sensor replacement. Replace the automatic level control sensor. Refer to Automatic Level Control Sensor Replacement .Did you complete the replacement? | Go to Step 10 | |
| 10 | 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 |
| IMPORTANT |
|---|
| System untested codes will continue to flash until self test has been completed after automatic level control sensor replacement. |
DTC 031
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for voltage at the coil side of the exhaust valve. The ELC fuse supplies power to the coil side of the exhaust valve.
- 3: This step verifies that the automatic level control sensor is providing ground to the exhaust valve.
- 4: This step tests if ground is constantly being applied to the exhaust valve.
- 10: This step verifies that the automatic level control sensor is self tested after replacement.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Turn ON the ignition. Disconnect the exhaust valve. Probe the battery positive voltage circuit of the exhaust valve with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 3 | Go to Step 8 |
| 3 | Connect a test lamp between the control circuit of the exhaust valve and a good ground. Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
| 4 | Test the control circuit of the exhaust valve for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 6 |
| 5 | Test the control circuit of the exhaust valve for an open circuit. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
| 6 | Inspect for poor connections at the exhaust valve. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. 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 automatic level control sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
| 8 | Repair the battery positive voltage circuit to the exhaust valve. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 11 | |
| 9 | Replace the exhaust valve. Refer to Air Compressor Replacement . Did you complete the replacement? | Go to Step 11 | |
| 10 | IMPORTANT: System untested codes will continue to flash until self test has been completed after automatic level control sensor replacement. Replace the automatic level control sensor. Refer to Automatic Level Control Sensor 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 |
| IMPORTANT |
|---|
| System untested codes will continue to flash until self test has been completed after automatic level control sensor replacement. |
DTC 032
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for something mechanical that is not allowing the vehicle to lower.
- 3: This step verifies the automatic level control sensor connector to have a good connection.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Level Control Suspension Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Check all air lines and exhaust valves for airflow blockage. Check both rear shock absorbers for binding. Did you find and correct the condition? | Go to Step 5 | Go to Step 3 |
| 3 | Inspect for poor connections at the harness connector of the automatic level control sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 5 | Go to Step 4 |
| 4 | IMPORTANT: System untested codes will continue to flash until a self test has been completed after automatic level control sensor replacement. Replace the automatic level control sensor. Refer to Automatic Level Control Sensor Replacement .Did you complete the replacement? | Go to Step 5 | |
| 5 | 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 |
| IMPORTANT |
|---|
| System untested codes will continue to flash until a self test has been completed after automatic level control sensor replacement. |
DTC 033
Symptoms - Automatic Level Control
Review the system operation in order to familiarize yourself with the system functions. Refer to Automatic Level Control Description and Operation .
Before diagnosing any Automatic Level Control (ALC) System symptoms, perform the ALC self-test. The ALC self-test will test the system operation and display any current fault codes. Refer to Diagnostic Trouble Code (DTC) Displaying for instructions on activating the self-test and displaying fault codes.