Tools Required
| • | J 22124-B J 22124-B Pressure Gage (0-300 psi) |
| • | J 22124-91 J 22124-91 Adapter Tube |
Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
DEFINITION: | ||||||||||||
1 | Is any aftermarket equipment installed on the vehicle that could affect the ALC system? | -- | Go to Step 2 | Go to Step 4 | ||||||||
2 | Check the aftermarket equipment to ensure that it is not affecting ALC performance. Is the aftermarket equipment affecting the ALC performance? | -- | Go to Step 3 | Go to Step 4 | ||||||||
3 | Correct the condition. Is the condition corrected? | -- | -- | |||||||||
4 | Check the ELC fuse and ELC circuit breaker (C Car) or the IGN 3 fuse and ELC fuse (G Car) for an open (blown) condition. Is the fuse open or the circuit breaker tripped? | -- | Go to Step 5 | Go to Step 6 | ||||||||
5 | Replace the fuse or reset the circuit breaker. NOTE: If the fuse is blown (open) or the circuit breaker is tripped repeatedly, check CKT 41 (BRN) or CKT 340 (ORN) for a short circuit to ground condition. Is the replacement, reset or repair complete? | -- | -- | |||||||||
6 | Check the height sensor and link for proper connection and damage. Are the height sensor and the link properly connected and in good condition? | -- | Go to Step 8 | Go to Step 7 | ||||||||
7 | Reconnect or replace the height sensor or the link. Refer to Automatic Level Control Sensor and Bracket Replacement . Is the repair or replacement complete? | -- | -- | |||||||||
8 | Does the vehicle leak down when the vehicle is not used for an extended period of time (overnight), but then come up to normal trim height with vehicle use? | -- | Go to Step 28 | Go to Step 9 | ||||||||
9 |
Does the rear of the vehicle rise and not leak down? NOTE: Allow 27 seconds for the air compressor to start and then additional time for the shock absorbers to inflate. | Go to Step 10 | Go to Step 12 | |||||||||
10 | Is the trim height at the rear underbody points correct? Refer to Trim Height . | Trim Height | Go to Step 11 | |||||||||
11 | Adjust the height sensor. Refer to Automatic Level Control Sensor Adjustment . Is trim height at the rear underbody points correct? Refer to Trim Height . | Trim Height | ||||||||||
12 | Did the air compressor operate when weight was added? | -- | Go to Step 28 | Go to Step 13 | ||||||||
13 |
Is the air compressor operating? | -- | Go to Step 14 | |||||||||
14 |
Is battery voltage present? | Battery Voltage | Go to Step 16 | Go to Step 15 | ||||||||
15 | Check for an open ELC fuse. If the fuse is OK, repair the open circuit condition in circuit 41. Is the replacement or repair complete? | -- | -- | |||||||||
16 | Measure the voltage from the terminal where relay pin 30 was removed to ground (this terminal is hot at all times). Is battery voltage present? | Battery Voltage | Go to Step 18 | Go to Step 17 | ||||||||
17 | Repair the open circuit condition in the rear junction block (C car) or the open circuit condition in circuit 340 (G car) between the RH and LH rear junction boxes. Is the repair complete? | -- | -- | |||||||||
18 |
Is battery voltage present after 17 to 27 seconds (17 to 27 seconds is the height sensor delay period). | Battery Voltage | Go to Step 20 | Go to Step 19 | ||||||||
19 | Check for a poor connection at the height sensor connector, terminal B, or an open-circuit condition in circuit 321. Was a poor connection or open-circuit condition found and corrected? | -- | ||||||||||
20 | Connect a 30-amp fused jumper between the terminals where relay pins 30 and 87 were removed. Is the air compressor operating? | -- | Go to Step 21 | Go to Step 22 | ||||||||
21 | Replace the ELC relay. Is the replacement complete? | -- | -- | |||||||||
22 |
Is battery voltage present? | Battery Voltage | Go to Step 24 | Go to Step 23 | ||||||||
23 |
Is the repair complete? | -- | -- | |||||||||
24 |
Is battery voltage present? | Battery Voltage | Go to Step 26 | Go to Step 25 | ||||||||
25 | Repair the open-circuit condition:
Is the repair complete? | -- | -- | |||||||||
26 |
Is the air compressor operating? | -- | Go to Step 13 | Go to Step 27 | ||||||||
27 | Replace the air compressor. Refer to Air Compressor Replacement . Is the replacement complete? | -- | -- | |||||||||
28 | Check the following:
Was a leak or damage found and corrected? | -- | Go to Step 29 | |||||||||
29 |
Is the air compressor able to reach it 690 kPa (100 psi)? | 690 kPa (100 psi) | Go to Step 31 | Go to Step 30 | ||||||||
30 | Replace the air compressor. Refer to Air Compressor Replacement . Is the replacement complete? | -- | -- | |||||||||
31 | Does the air pressure reading on the J 22124-B J 22124-B stay at 690 kPa (100 psi)? | 690 kPa (100 psi) | Go to Step 32 | Go to Air Compressor Leak Test | ||||||||
32 |
Is the air compressor able to reach 690 kPa (100 psi) and then maintain 690 kPa (100 psi) after the jumper is disconnected from terminal D? | 690 kPa (100 psi) | Go to Step 34 | Go to Step 33 | ||||||||
33 | Replace the LH rear shock absorber. Refer to Shock Absorber Replacement . | -- | -- | |||||||||
34 |
Is the air compressor able to reach 690 kPa (100 psi) | 690 kPa (100 psi) | Go to Step 36 | Go to Step 35 | ||||||||
35 | Replace the RH rear shock absorber. Refer to Shock Absorber Replacement . Is the replacement complete? | -- | -- | |||||||||
36 |
Is the air compressor able to reach 690 kPa (100 psi) and then maintain 690 kPa (100 psi) after the jumper is disconnected from terminal D? | 690 kPa (100 psi) | Go to Step 38 | Go to Step 37 | ||||||||
37 | Replace the air tube. Refer to Air Tube Replacement . Is the replacement complete? | -- | -- | |||||||||
38 | Check for a binding rear shock absorber. Was a binding shock absorber found and replaced? | -- | -- | |||||||||
