Magnasteer/Variable Effort Steering (VES)

Part 1 Of 5:

Part 2 Of 5:

Part 3 Of 5:

Part 4 Of 5:

Part 5 Of 5:

CIRCUIT DESCRIPTION
A 5.0 volt reference is supplied to the steering wheel position sensor through Electronic Brake Control Module (EBCM) terminal 1 to sensor terminal A. Steering wheel position input to the EBCM is provided through steering wheel position sensor terminal B to EBCM terminal 17. Steering wheel position sensor ground is provided through EBCM terminal 5.

CONDITIONS FOR SETTING THE DTC
DTC C1243 can set anytime. A malfunction exists if the steering wheel position sensor voltage is less than 0.4 volts or greater than 4.7 volts. DTC C1243 can also set if the steering wheel position sensor voltage changes by more than 2.0 volts within 8.0 milli-seconds.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, VES is disabled and power steering returns to full assist. ABS remains functional.

CONDITIONS FOR CLEARING THE DTC
- Conditions for the malfunction are no longer present and scan tool clear DTCs function is used.
- 100 ignition switch key cycles have passed with no malfunctions detected.



DIAGNOSTIC AIDS
Possible causes:
- Open or short in any of the sensor signal circuit wires.
- Malfunctioning steering wheel position sensor.
Ensure all ABS DTCs are diagnosed and corrected prior to clearing VES DTCs. Clearing VES DTCs will automatically clear ABS DTCs resulting in a loss of DTC history data.

An Intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Scan Tool, as described in Enhanced Diagnostics, found in this section.

Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wingnut connections or physical damage to the wiring harness.