Step | Action | Value(s) | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
DEFINITION: The ALC compressor motor does not activate when the air inflator switch is turned on. | ||||||||||
1 | Did you review the Automatic Level Control System Description and Operation and perform the necessary inspections? | -- | Go to Step 2 | |||||||
2 |
Does the ALC air compressor operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||||
3 | Inspect the ELC/TRAILER fuse. Is the ELC/TRAILER fuse open? | -- | Go to Step 19 | Go to Step 4 | ||||||
4 | Inspect the PWR QTR VENT fuse. Is the PWR QTR VENT fuse open? | -- | Go to Step 20 | Go to Step 5 | ||||||
5 |
Does the voltage measure near the specified value? | B+ | Go to Step 6 | Go to Step 21 | ||||||
6 | Measure the voltage between the other battery positive voltage circuit and ground. Does the voltage measure near the specified value? | B+ | Go to Step 7 | Go to Step 21 | ||||||
7 |
Does the voltage measure near the specified value? | B+ | Go to Step 8 | Go to Step 22 | ||||||
8 | Measure the voltage between the accessory voltage circuit and the ground circuit of the ALC air compressor connector. Does the voltage measure near the specified value? | B+ | Go to Step 9 | Go to Step 23 | ||||||
9 |
Does the voltage measure near the specified value? | B+ | Go to Step 10 | Go to Step 24 | ||||||
10 | Measure the voltage between the battery positive voltage circuit and the ground circuit of the ALC air inflator relay connector. Does the voltage measure near the specified value? | B+ | Go to Step 11 | Go to Step 25 | ||||||
11 |
Does the voltage measure near the specified value? | B+ | Go to Step 12 | Go to Step 26 | ||||||
12 | Measure the voltage from the ALC relay coil supply voltage circuit of the ALC sensor connector to a good ground. Does the voltage measure near the specified value? | B+ | Go to Step 13 | Go to Step 26 | ||||||
13 |
Does the voltage measure near the specified value? | B+ | Go to Step 14 | Go to Step 27 | ||||||
14 |
Does the voltage measure near the specified value? | B+
| Go to Step 15 | Go to Step 16 | ||||||
15 |
Did the ALC air compressor activate? | -- | Go to Step 29 | Go to Step 17 | ||||||
16 | Test the ALC inflation timer relay coil control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 32 | Go to Step 28 | ||||||
17 | Test the ground circuit of the air inflator switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 32 | Go to Step 18 | ||||||
18 |
Did the ALC air compressor activate? | -- | Go to Step 30 | Go to Step 31 | ||||||
19 | Repair the short to ground in the battery positive voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
20 | Repair the short to ground in the accessory voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
21 | Repair the open in the battery positive voltage circuit of the ALC air compressor. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
22 | Repair the open in the accessory voltage circuit of the ALC air compressor. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
23 | Repair the open in the ground circuit to the ALC air compressor. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
24 | Repair the open in the battery positive voltage circuit of the ALC air inflator relay connector. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
25 | Repair the open in the ground circuit of the ALC air inflator relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
26 | Repair the open in the ALC relay coil supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
27 | Repair the open in the ALC height sensor circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 32 | -- | ||||||
28 | Replace the ALC air inflator relay. Refer to Automatic Level Control Relay Replacement . Did you complete the replacement? | -- | Go to Step 32 | -- | ||||||
29 | Replace the air inflator switch. Refer to Automatic Level Control Inflator Air Switch Replacement . Did you complete the replacement? | -- | Go to Step 32 | -- | ||||||
30 | Replace the ALC air compressor relay. Did you complete the replacement? | -- | Go to Step 32 | -- | ||||||
31 | Replace the ALC air compressor. Refer to Air Compressor Replacement . Did you complete the replacement? | -- | Go to Step 32 | -- | ||||||
32 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |