Steering - Hiss/Rush Noise From Steering Column
TSB SBO5-10-S002Hiss/Rush Noise From Steering Column Area
ISSUE DATE: SEPTEMBER 22, 2005
Affected Vehicles
2003-2005 Isuzu Ascender (US/UT)
Service Information
Condition:
Some customers may comment on a low volume hiss and/or rush noise heard from the steering column area. The noise may change when the steering wheel is rotated in either direction. The noise may be noticeable with the engine ON, vehicle in PARK, HVAC and Radio OFF.
Possible Cause:
The lower steering column intermediate shaft may be internally grounding out, creating a noise path.
Correction:
Replace Lower Intermediate Shaft.
Service Procedure
IMPORTANT:
Perform the diagnosis FIRST. DO NOT REPLACE steering gear, power steering pump, or hose for this condition.
To determine if the lower intermediate shaft is allowing noise to travel from the power steering hydraulic system into the vehicle passenger compartment, follow the steps below.
1. Confirm the customers concern.
NOTE:
The front wheels of the vehicle must be maintained in the straight ahead position and the steering column must be in the LOCK position before disconnecting the steering column or intermediate shaft. Failure to follow these procedures will cause improper alignment of some components during installation aid result in damage to the SIR coil assembly.
2. Turn the steering wheel so that the front wheels are pointing straight ahead.
3. Turn the ignition switch to the lock position and remove the key.
4. Lock the steering column through the access hole in the lower steering column trim cover using the Kent Moore J 42640 Steering Column Anti-Rotation Pin.
5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the Service Manual.
6. Disconnect the upper intermediate shaft boot from the lower intermediate shaft boot to gain access to the upper intermediate shaft to lower intermediate pinch bolt.
7. Remove the lower intermediate shaft to upper intermediate shaft pinch bolt.
8. Disconnect the lower intermediate shaft from the upper intermediate shaft.
9. Lower the vehicle.
10. Attempt to duplicate the customers concern again.
^ If the noise is still present with the intermediate shaft disconnected, DO NOT replace the intermediate shaft. Refer to Noise in Steering Column in the Service Manual.
^ If the noise is not present, continue with the next step.
11. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information in the Service Manual.
12. Disconnect the lower intermediate shaft boot from the power steering gear and remove the intermediate shaft boot from the vehicle.
IMPORTANT:
Note the relationship of the intermediate shaft to the power steering gear and the intermediate shaft to the steering column in order to ensure proper installation.
13. Remove the lower intermediate shaft to the power steering gear input shaft pinch bolt.
14. Disconnect the lower intermediate shaft from the power steering gear.
15. Remove the lower intermediate shaft from the vehicle.
16. Replace the lower intermediate shaft, P/N 8-15155-707-0. Refer to Intermediate Steering Shaft Replacement-Installation-Lower in the Service Manual.
Parts Information
Warranty Claim Information
Use the labor operation shown.
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