C1704: Right Rear Sensor Circuit Fault

Definition

The OBD2 code C1704 indicates a fault in the right rear sensor circuit, typically related to issues with the vehicle's stability control or anti-lock braking system

Common causes

Faulty right rear wheel speed sensor
Damaged wiring or connectors in the sensor circuit
Corroded or loose electrical connections
Faulty ABS control module
Issues with the vehicle's power supply
Wheel bearing problems affecting sensor operation
Incorrectly installed or misaligned sensor

Common misdiagnoses

Faulty wheel speed sensor
Damaged wiring or connectors
ABS control module issues
Incorrectly calibrated or programmed ABS system
Brake system problems
Faulty electronic control unit (ECU)
Tire size discrepancies
Wheel bearing issues

Troubleshooting steps

1. Check for Additional Codes

Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues
2. Inspect Wiring and Connectors
3. Visually inspect the wiring and connectors associated with the right rear wheel speed sensor. Look for signs of damage, corrosion, or loose connections
4. Ensure that the wiring is not pinched, frayed, or exposed to heat sources
5. Test the Wheel Speed Sensor
6. Disconnect the sensor and test its resistance with a multimeter. Compare the readings to the manufacturer's specifications
7. If the resistance is out of range, the sensor may be faulty and should be replaced
8. Check the Sensor Signal
9. With the sensor connected, use a multimeter or an oscilloscope to check the signal output while the wheel is turned. The signal should vary as the wheel rotates
10. If there is no signal or an erratic signal, the sensor may be defective
11. Inspect the ABS Module
12. Check the ABS control module for any signs of damage or corrosion. Ensure that all connections are secure
13. If the module is suspected to be faulty, it may need to be tested or replaced
14. Check for Ground Issues
15. Ensure that the ground connections for the ABS system and the wheel speed sensor are clean and secure. A poor ground can cause circuit faults
16. Look for Mechanical Issues
17. Inspect the brake components and wheel assembly for any mechanical issues that could affect the sensor, such as a damaged tone ring or debris obstructing the sensor
18. Clear Codes and Test Drive
19. After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns
20. Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the right rear sensor circuit
21. Seek Professional Help
22. If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1704 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect Wiring and Connectors

3. Visually inspect the wiring and connectors associated with the right rear wheel speed sensor. Look for signs of damage, corrosion, or loose connections

4. Ensure that the wiring is not pinched, frayed, or exposed to heat sources

5. Test the Wheel Speed Sensor

6. Disconnect the sensor and test its resistance with a multimeter. Compare the readings to the manufacturer's specifications

7. If the resistance is out of range, the sensor may be faulty and should be replaced

8. Check the Sensor Signal

9. With the sensor connected, use a multimeter or an oscilloscope to check the signal output while the wheel is turned. The signal should vary as the wheel rotates

10. If there is no signal or an erratic signal, the sensor may be defective

11. Inspect the ABS Module

12. Check the ABS control module for any signs of damage or corrosion. Ensure that all connections are secure

13. If the module is suspected to be faulty, it may need to be tested or replaced

14. Check for Ground Issues

15. Ensure that the ground connections for the ABS system and the wheel speed sensor are clean and secure. A poor ground can cause circuit faults

16. Look for Mechanical Issues

17. Inspect the brake components and wheel assembly for any mechanical issues that could affect the sensor, such as a damaged tone ring or debris obstructing the sensor

18. Clear Codes and Test Drive

19. After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

20. Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the right rear sensor circuit

21. Seek Professional Help

22. If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1704 code