Retrieving Codes (DTCS)
- Connect New Generation Star (NGS) Tester, or equivalent, to the air suspension/EVO steering test connector. Test connector is located in front of the passenger side shock tower. See Figure .For connector terminal identification, see Fig 1 .
- Execute Function Test 211. Record stored DTCs. For aftermarket scan tools, follower scan tool manufacturer's instructions for retrieving DTCs.
- Run Auto Test Diagnostics to determine which DTCs are currently being detected.
- If stored DTCs are different than current DTCs, repair current DTCs first.
- If more than one DTC is displayed in stored or current memory, repair in the following order:
- Electrical Faults: DTC 25, DTCs 50 through 95
- Electro-Pneumatic Faults: DTCs 98 through 99
- Courtesy Lamp Switches, DTC 29; Steering Wheel Rotation Sensor, DTC 45
- If no DTCs are retrieved, go to SYMPTOM CHARTS to diagnosis non-electrical related steering problems.
- If DTCs are retrieved, go to AIR SUSPENSION/EVO DIAGNOSTIC TROUBLE CODE INDEX table to continue diagnosis.
- If NGS tester or scan tool cannot communicate with air suspension/EVO module, go to TEST C: NO COMMUNICATION WITH THE MODULE - EVO CONTROL MODULE .
NOTE:
Prior to testing for any of the following DTCs, repair DTC 18 for low battery voltage or DTC 19 for high battery voltage to determine power and ground. If no fault is found, do not replace any parts, but continue with listed DTCs.
AIR SUSPENSION/EVO DIAGNOSTIC TROUBLE CODE INDEX
| DTC | Description | Perform Test | ||
|---|---|---|---|---|
| 10 | Auto Test in Progress | None | ||
| 11 | Auto Test Passed | None | ||
| 12 | Perform Manual Tests | None | ||
| 15 | No Faults Stored in Memory | None | ||
| 18 | Control Module Detects Low Battery Voltage | (1) | ||
| 19 | Control Module Detects High Battery Voltage | (1) | ||
| 20 | Control Module Memory Error 2 | (1) | ||
| 25 | Air Suspension Height Sensor Supply Not 5 Volts | (1) | ||
| 29 | Two Door Cycles Not Detected During Test | (1) | ||
| 35 | EVO Power Steering Control Valve Actuator Concern | DTC 35 | ||
| 45 | Steering Rotation Not Detected | DTC 45 | ||
| 50 | LH Front Air Suspension Height Sensor Signal Out of Range | (1) | ||
| 55 | RH Front Air Suspension Height Sensor Signal Out of Range | (1) | ||
| 60 | LH Rear Air Suspension Height Sensor Signal Out of Range | (1) | ||
| 70 | Vent Solenoid Valve | (1) | ||
| 75 | Compressor Relay Control Circuit | (1) | ||
| 80 | LH Front Spring Solenoid Valve Circuit Failure | (1) | ||
| 85 | RH Front Spring Solenoid Valve Circuit Failure | (1) | ||
| 90 | LH Rear Spring Solenoid Valve Circuit Failure | (1) | ||
| 95 | RH Rear Spring Solenoid Valve Circuit Failure | (1) | ||
| 98 | Compressor Run Time Exceeded | (1) | ||
| 99 | Unable to Detect Raising or Lowering of One or More Corners | (1) | ||
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