With Air Suspension

CAUTION: Do not hold the steering wheel at the stops for an extended amount of time. Damage to the power steering pump will result.

NOTE:
- All vehicles have EVO steering. Vehicles with air suspension control the EVO with the air suspension control module. Vehicles without air suspension use an EVO control module.
- Make the following preliminary checks before repairing the steering system. Label all hoses prior to removal.

1. Verify the customer concern.
2. Visually inspect the following for obvious signs of mechanical and electrical damage:

Mechanical
- Tire pressure, loose wheels
- Loose tie rod ends, inner ball joints
- Loose suspension struts or ball joints
- Loose universal joints
- Loose connecting bolts on column intermediate shaft
- Loose steering gear assembly
- Drive belt
- Binding or misaligned steering column
- Power steering pump, fluid level, hose leak or line rest restrictions

Electrical
- Open fuses:
- Fuse 5 (15A) and Fuse 6 (5A) in fuse junction panel
- Fuse 4 (15A) in power distribution box

- Circuitry, connections open, grounding or shorting
- Electronic steering sensor
- Vehicle speed sensor (VSS)
- Power steering pump actuator valve
- Electronic Variable Orifice (EVO) control module/air suspension control module
- Diagnostic connector/data link connector

3. If the inspection reveals obvious concern(s) that can be readily identified, repair as necessary.
4. If the concern remains after the inspection, use New Generation STAR (NGS) Tester to retrieve Diagnostic Trouble Codes (DTCs).
(1) Connect NGS tester to the data link connector C228F.
(2) Retrieve the DTCs. Use NGS to retrieve the DTCs from the 4WAS - AIR SUSP/EVO (4x2 and 4x4) module.
(3) Refer to the DTC chart - With Air Suspension for the correct Pinpoint Test to go to.

5. If no DTCs are retrieved, go to the Function Test - With Air Suspension. Function Tests