B1387

Fig. 21 Codes B1387: Wheel Sensor Rear Right, No Signal Open Circuit (Part 1 Of 2):

Fig. 21 Codes B1387: Wheel Sensor Rear Right, No Signal Open Circuit (Part 2 Of 2):

Fault symptom
ABS warning lamp on, no ABS function.

Condition
Fault registered as open-circuit

Diagnostic help
The rear right wheel sensor can be read by ISAT.
- Select "READ FUNCTIONS"
- Select "WHEEL SPEEDS"

The current wheel speed in km/h is displayed.
- If the rear assembly of the vehicle is lifted the ISAT should display approx. 5 km/h if the right rear wheel is rotated by hand at approx. 1 turn per second.

Diagnostic procedure
1 Wheel sensor resistance check
- Disconnect the electronic control module connector.
- Take a resistance reading at the electronic control module sensor connector between pins 1 and 2. The resistance should be 0.8-1.7 kOhm.

Is the resistance rating correct?
YES - Continue with point 3.
NO - Continue with point 2.

2 Wheel speed sensor resistance check cont.
- Remove the wheel sensor connector. The sensor connector is integrated in the wheel sensor against the rear side of the wheel sensor.
- Take a resistance reading at the wheel sensor switch between two connector pins. The resistance should be 0.8-1.7 kOhm.

Is the resistance rating correct?
YES - check and rectify the wiring including the connection between the electronic control module and the wheel sensor.
NO - Inspect the wheel sensor connector for damp and corrosion. If there is no obvious fault cause, change the wheel sensor.

3 Final Inspection
- Erase the diagnostic trouble code.
- Carry out the driving cycle, drive the car with various load and engine speeds for 5 minutes.
- Read the diagnostic trouble code.

Is the diagnostic trouble code stored?
YES - Continue With "Test Procedure Prior To Replacing ECM"
NO - The diagnostic procedure taken is right.