Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | |||
1 | Did you review the Automatic Level Control (ALC) Description and Operation? | Go to Step 2 | |
2 |
Important: The vehicle must be raised with a drive on hoist.
Does the test lamp illuminate? | Go to Step 3 | Go to Step 12 |
3 | Connect a test lamp between the position sensor harness connector positive battery voltage terminal and the position sensor harness connector ground terminal. Does the test lamp illuminate? | Go to Step 4 | Go to Step 13 |
4 | Using a 3 amp fused jumper wire, jumper the position sensor harness connector exhaust solenoid control circuit to a good ground. Did the exhaust solenoid click? | Go to Step 5 | Go to Step 8 |
5 | Did the vehicle lower? | Go to Step 6 | Go to Step 10 |
6 | Check the ALC position sensor adjustment. Refer to Automatic Level Control Sensor Adjustment . Is the adjustment OK? | Go to Step 14 | Go to Step 7 |
7 | Readjust the ALC position sensor. Refer to Automatic Level Control Sensor and Bracket Replacement . Did you complete the adjustment? | Go to Step 20 | -- |
8 | Test the ALC exhaust solenoid feed circuit for a open circuit or a short to ground. Refer to Circuit Testing and Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 9 |
9 | Test the ALC exhaust solenoid control circuit for a open circuit or a short to ground. Refer to Circuit Testing in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 15 |
10 | Disconnect the air tube assembly from the drier. Did the vehicle lower? | Go to Step 15 | Go to Step 11 |
11 | Disconnect the air tube assembly from the shocks. Did the vehicle lower? | Go to Step 16 | Go to Step 17 |
12 | Repair open circuit or short to ground on the position sensor positive battery circuit. Did you complete the repair? | Go to Step 20 | -- |
13 | Repair open circuit or short to voltage on the position sensor ground circuit. Did you complete the repair? | Go to Step 20 | -- |
14 | Inspect for poor connections/terminal tension at the harness connector for the ALC position sensor. Did you find and correct the condition? | Go to Step 20 | Go to Step 18 |
15 | Inspect for poor connections/terminal tension at the harness connector for the ALC exhaust solenoid. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 |
16 | Replace the air tube assembly. Refer to Automatic Level Control Air Compressor Head Replacement . Did you complete the replacement? | Go to Step 20 | -- |
17 | Replace the shock that did not lower. Did you complete the replacement? | Go to Step 20 | -- |
18 | Replace the ALC position sensor. Refer to Automatic Level Control Sensor and Bracket Replacement . Did you complete the replacement? | Go to Step 20 | -- |
19 | Replace the ALC compressor head assembly. Refer to Automatic Level Control Air Compressor Head Replacement . Did you complete the replacement? | Go to Step 20 | -- |
20 | Operate the vehicle within the conditions for enabling the automatic level control. Does the ALC operate properly? | System OK | Go to Step 2 |
