C155E-11

C155E-11-RIDE HEIGHT PRESSURE VENT CONTROL - CIRCUIT SHORT TO GROUND

For a complete wiring diagram, refer to the Wiring Information.





- When Monitored:
Ignition on. Battery voltage between 9 and 16 volts.

- Set Condition:
The Air Suspension Control Module (ASCM) detects the valve control circuit is shorted to ground while ignition is in the Run position.





Diagnostic Test

1. VERIFY THE DTC IS ACTIVE

NOTE: If multiple DTCs are present, inspect the wiring and connector at the Air Suspension Compressor.

1. Ignition on, engine not running.
2. With the scan tool, record and erase DTCs.
3. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Go To 4

2. (Y35) AMBIENT VALVE CONTROL CIRCUIT SHORTED TO GROUND




1. Turn the ignition off to the lock position.
2. Disconnect the Air Suspension Solenoid Assembly harness connector.
3. Disconnect the ASCM C2 harness connector.
4. Measure the resistance between ground and the (Y35) Ambient Valve Control circuit.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (Y35) Ambient Valve Control circuit for a short to ground.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Go To 3

3. AIR SUSPENSION SOLENOID ASSEMBLY




1. Connect the Air Suspension Solenoid Assembly harness connector.
2. Measure the resistance between (Y13) Pressure Sensor Return circuit and the (Y35) RR Ambient Valve Control circuit at the ASCM C2 harness connector.

Is the resistance below 30 Ohms?

Yes

- Replace the Air Suspension Solenoid Assembly. Compressor Assembly Valve Block - Removal.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Replace the Air Suspension Control Module (ASCM). Air Suspension Control Module - Removal.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

4. INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
3. Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ASCM VERIFICATION TEST. ASCM Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.