Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 for an open. Is the fuse open or the circuit breaker tripped? | -- | Go to Step 5 | Go to Step 6 | ||||||||||
5 |
Important: If the fuse is open or the circuit breaker is tripped repeatedly, check CKT 41 or CKT 340 for a short to ground. Replace the fuse or reset the circuit breaker. 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 |
Important: Allow 27 seconds for the air compressor to start and then additional time for the shock absorbers to inflate. Does the rear of the vehicle rise and not leak down? | -- | Go to Step 10 | Go to Step 12 | ||||||||||
10 | Is the trim height at the rear underbody points correct? Refer to 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 . |
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12 | Did the air compressor operate when weight was added? | -- | Go to Step 28 | Go to Step 13 | ||||||||||
13 |
Turn the ignition switch to the ON position. Is the air compressor operating? | -- | Go to Step 14 | |||||||||||
14 |
Is the measurement within the specified range? | 10.5-15 V | Go to Step 16 | Go to Step 15 | ||||||||||
15 | Check for an open ELC fuse. If the fuse is OK, repair the open in CKT 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 the measurement within the specified range? | 10.5-15 V | Go to Step 18 | Go to Step 17 | ||||||||||
17 | Repair the open in the rear junction block. Is the repair complete? | -- | -- | |||||||||||
18 |
Important: The ignition switch must be cycled if the ignition was left on from the previous step. Is battery voltage present after 17-27 seconds (17-27 seconds is the height sensor delay period)? | 10.5-15 V | Go to Step 20 | Go to Step 19 | ||||||||||
19 | Check for a poor connection at the height sensor connector, terminal B, or an open in CKT 321. Was a poor connection or open 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 the measurement within the specified range? | 10.5-15 V | Go to Step 24 | Go to Step 23 | ||||||||||
23 |
Is the repair complete? | -- | -- | |||||||||||
24 |
Is the measurement within the specified range? | 10.5-15 V | Go to Step 26 | Go to Step 25 | ||||||||||
25 | Repair the open in CKT 650. 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 |
Disconnect the jumper from terminal D when 690 kPa (100 psi) is reached. Is the air compressor able to reach the specified pressure? | 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 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 . Is the replacement complete? | -- | -- | |||||||||||
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? | -- | -- |
