DTC 43

DTC 43 VES Steering Wheel Position Sensor Circuit Malfunction (For ABS With VES Only) (Part 1 Of 3):

DTC 43 VES Steering Wheel Position Sensor Circuit Malfunction (For ABS With VES Only) (Part 2 Of 3):

DTC 43 VES Steering Wheel Position Sensor Circuit Malfunction (For ABS With VES Only) (Part 3 Of 3):

DTC 43 VES Steering Wheel Position Sensor Circuit Malfunction (For ABS With VES Only):

Circuit Description:
A 5.0 volt reference is supplied to the steering wheel position sensor through EBCM/EBTCM terminal "1" to sensor terminal "A". Steering wheel position input to the EBCM/EBTCM is provided through steering wheel position sensor terminal "B" to EBCM/EBTCM terminal "17". Steering wheel position sensor ground is provided through EBCM/EBTCM terminal "5".

DTC Will Set When:
DTC 43 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 43 can also set if the steering wheel position sensor voltage changes by more than 2.0 within 8.0 msec.

Action Taken:
A malfunction DTC is stored, VES is disabled and power steering returns to full assist.

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks steering wheel position sensor input to the EBCM/EBTCM.
2. Checks for a short between the steering wheel position sensor input and ground circuits.
3. Checks for a short between the steering wheel position sensor VCC and ground circuits.
4. Checks for a short to ground in the steering wheel position sensor input circuit.
5. Checks for a short to ground in the steering wheel position sensor VCC circuit.
6. Checks for high resistance in the steering wheel position sensor VCC circuit.
7. Checks for high resistance in the steering wheel position sensor input circuit.
8. Checks for poor terminal contact.
9. Checks for proper voltage output of the EBCM/EBTCM.
10. Ensures malfunction was not due to physical damage of the steering wheel position sensor circuits.
11. Checks for proper voltage with the steering wheel position sensor disconnected.
12. Checks for high resistance in the steering wheel position sensor ground.
13. Isolates high resistance to the EBCM/EBTCM or the ground circuit.
14. Ensures open ground was not due to a short to battery.
15. Ensures malfunction was not due to circuit damage or poor terminal contact.
16. Checks for a short to voltage in the steering wheel position sensor circuit.
17. Ensures malfunction was not due to physical damage of the circuitry.
18. Checks for proper voltage with the steering wheel position sensor connected.
19. Checks for proper voltage with the steering wheel position sensor disconnected.
20. Checks for a short to voltage in the steering wheel position sensor VCC circuit.
21. Ensures malfunction was not due to physical damage of the circuitry.
22. Checks for a short between the steering wheel position sensor VCC and input circuits.
23. Checks for proper resistance of the steering wheel position sensor.
24. Ensures malfunction was not due to physical damage of the circuits.
25. Checks for an open resistor in the steering wheel position sensor.

Diagnostic Aids:
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 Tech 1.

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 wiring connections or physical damage to the wiring harness.