Case study: A lack of information does not stop Des finding an ABS fault By Des Davies AAE MIMI, Top Gear Motor Services Vehicle: Kia Picanto 1.0 2006, mileage 119,235 Fault: ABS light permanently lit on the dashboard A customer brought their 2006 Picanto in for a pre-MOT check and I noticed that the ABS warning light was permanently on. The customer said they thought this was normal as it had been displayed on the dashboard for a long time, ever since they had acquired the vehicle.
CASE STUDY
I connected my scanner to the OBD port and the following code was retrieved from the ECU:
22
C1204 Wheel speed sensor Front-RH Range/ Characteristics/Interrupt Here are some possible causes for this code: • Improper installation of the wheel speed sensor • Abnormal rotor and wheel bearing faults • Faulty front right wheel Speed Sensor • Front right wheel speed sensor harness is open or shorted • Front right wheel speed sensor circuit poor electrical connection.
A quick visual inspection was carried out to see if there was anything obvious – something loose or missing, a blown fuse etc. I again connected my scanner to the EOBD port then road tested the vehicle to confirm the fault and to see if there were other issues related to this fault code. I discovered that the R/F wheel speed sensor output was intermittent at higher speeds. I found no Autodata information available for this ABS system, so I had to use my knowledge and experience gained from previous ABS testing methods.
