Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the automatic level control suspension system operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 | Verify that the ALC system does not vent in order to lower the vehicle. Does the ALC system operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the vehicle lower? | -- | Go to Step 4 | Go to Step 8 |
4 | Test CKT 639 (PNK) at the ALC sensor for voltage. Is battery voltage present? | -- | Go to Step 5 | Go to Step 13 |
5 | Test CKT 1298 (LT BLU) at terminal C of the ALC sensor for voltage. Is battery voltage present? | -- | Go to Step 6 | Go to Step 14 |
6 | Test CKT 1350 (BLK) at the ALC sensor for an open circuit. Is an open present in CKT 1350 (BLK)? | -- | Go to Step 18 | Go to Step 7 |
7 | Replace the ALC sensor. Refer to Automatic Level Control Sensor and Bracket Replacement . Is the replacement complete? | -- | Go to Step 20 | -- |
8 | Test CKT 1840 (ORN) at terminal C of the ALC air compressor for voltage. Is battery voltage present? | -- | Go to Step 10 | Go to Step 9 |
9 | Repair the open in CKT 1840 (ORN) between the ALC air compressor and S474. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
10 | Connect a fused jumper wire (backprobe) from terminal B, CKT 320 (WHT) at the ALC air compressor to ground . Does the vehicle lower? | -- | Go to Step 11 | Go to Step 12 |
11 | Repair the open in CKT 320 (WHT) between the ALC air compressor and the ALC sensor. Is the repair complete? | -- | Go to Step 20 | -- |
12 | Replace the air compressor head. Refer to Automatic Level Control Air Compressor Head Replacement . Is the replacement complete? | -- | Go to Step 20 | -- |
13 | Repair the open in CKT 639 (PNK) between the ALC sensor and S473. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
14 | Test CKT 1840 (ORN) at the ALC timer relay for voltage. Is battery voltage present? | -- | Go to Step 16 | Go to Step 15 |
15 | Repair the open in CKT 1840 (ORN) between the ALC timer relay and S475. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
16 | Test CKT 1298 (LT BLU) at the ALC timer relay for voltage. Is battery voltage present? | -- | Go to Step 17 | Go to Step 19 |
17 | Repair the open in CKT 1298 (LT BLU) between the ALC timer relay and the ALC sensor. Is the repair complete? | -- | Go to Step 20 | -- |
18 | Repair the open in CKT 1350 (BLK). Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
19 | Replace the ALC timer relay. Refer to Automatic Level Control Relay Replacement . Is the replacement complete? | -- | Go to Step 20 | -- |
20 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
