| Document ID: 1911096 #07-02-32-001: Reduced Steering Effort (Diagnose/Replace Steering Wheel Position Sensor) - (Feb 27, 2007)
Subject:Reduced Steering Effort (Diagnose/Replace Steering Wheel Position Sensor)
Models:1997-2001 Chevrolet Silverado Classic
1997-1998 Chevrolet Astro, Express
1997-2001 GMC Sierra Classic
1997-1998 GMC Safari, Savana
This bulletin is being revised to update affected model years and parts information. Please discard Corporate Bulletin 86-32-06.
with EVO (Electronic Variable Orifice)
Some customers may comment about reduced steering effort while driving. This reduced steering effort may change back to the original effort intermittently during the driving or remain until the next key off-on cycle. These slight changes in steering effort do not affect the control of the vehicle, but may alert the driver that the system is not operating as intended.
The condition may be caused by high electrical resistance in the steering wheel speed sensor. The high electrical resistance is a result of inadequate contact pressure of the electrical contactor in the sensor.
Follow steps 1, 2 and 3 of the strategy based diagnostics for the condition. Refer to section 2B5 of the service manual, Diagnostic System Check. Verify that there are no stored DTCs. The conditions stated above typically will not set a DTC. If no DTC is found, do the following diagnosis:
- Disconnect the 3 wire connector from the steering wheel speed sensor.
- With the key in the OFF position, use a digital multimeter (DMM) to test for resistance between CKT 1057 (ORN/BLK) and CKT 1059 (LT BLU).
- Rotate the steering wheel slowly from lock to lock.
- Record the highest reading. If the reading is above 12K ohms, replace the steering wheel speed sensor and bearing assembly. If the reading is below 12K ohms, the steering wheel speed sensor is operating as designed.
Sensor Kit - Steering Wheel Position (Silverado and Sierra Light Duty)
Sensor - Steering Wheel Position (Astro, Safari, Express, Savana, Silverado HD and Sierra HD)
For vehicles repaired under warranty, use:
Sensor, Steering Wheel Rotation - Replace
Use Published Labor Operation Time
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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