Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Use a DMM to check supply voltage.
- Use a DMM to measure the resistance. If the resistance at any of the items listed below are not in the specified range, replace the rear position sensor.
- The resistance between the position 1 and the sensor ground circuit is 1720 Ω.
- The resistance between the position 1 and the 5 volt reference circuit is 1700 Ω.
- The resistance between the position 2 and the sensor ground circuit is 1780 Ω.
- The resistance between the position 2 and the 5 volt reference circuit is 1000 Ω.
- The resistance between the 5 volt reference circuit and the sensor ground circuit is 1780 Ω.
- When the supply voltage is open or shorted to ground, position 1 and position 2 data parameter show 0 volts on the scan tool.
- When the ground circuit is open, position 1 and position 2 data parameter show 5 volts on the scan tool.
- Using the data display menu verify that the rear wheel position 1 has an output voltage range between 0.25-4.75 volts.
- Using the data display menu verify that the rear wheel position 2 has an output voltage range between 0.25-4.75 volts.
- Use a DMM to check resistance at the rear wheel position sensor. When the steering wheel is centered, the resistance between the rear wheel position sensor position 1 or position 2 signal and rear wheel position sensor ground is approximately 1,500 Ω.
- Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs
- Inspect the rear wheel position sensor for damage. If none is found then remove and inspect the sensor and coupler for damage or water intrusion. Refer to Rear Position Sensor Replacement . If water damage is found, refer to Rack and Pinion Boot Replacement .
- Rear Wheel Position Sensor Voltage-Rear Wheel Position Sensor Voltage 2 is at 2.5 volt when centered.
- Rear Wheel Position Sensor
- Rear Position Sensor Voltages