1.CHECK OUTPUT OF ABS WHEEL SPEED SENSOR USING SUBARU SELECT MONITOR. 1) Using the Subaru Select Monitor, select “Data monitor” and “Freeze frame data”. Subaru Select Monitor > OPERATION Subaru Select Monitor > OPERATION 2) Read the defective ABS wheel speed sensor output. | During acceleration/deceleration when the steering wheel is in the straight-ahead position, does the speed indicated on the data monitor change in response to the speedometer reading- In addition, are the wheel speed values of the freeze frame data for 4 wheels almost the same- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
2.CHECK POOR CONTACT OF CONNECTOR. Turn the ignition switch to OFF. | Is there poor contact of connectors between VDCCM&H/U and ABS wheel speed sensor- | | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
3.CHECK CAUSE OF SIGNAL NOISE. Make sure the radio wave devices and electronic components are installed correctly. | Are the radio wave devices and electronic components installed correctly- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL | Install the radio wave devices and electronic components properly. |
4.CHECK CAUSE OF SIGNAL NOISE. Check if the noise sources (such as an antenna) are installed near the sensor harness. | Are noise sources installed- | Install the noise sources apart from sensor harness. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
5.CHECK VDCCM&H/U. 1) Connect all connectors. 2) Perform the Clear Memory Mode. Clear Memory Mode 3) Perform the Inspection Mode. Inspection Mode 4) Read the DTC. Read Diagnostic Trouble Code (DTC) | Is the same DTC displayed- | Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
6.CHECK DETECTION OF OTHER DTCS FOR VDC. Read Diagnostic Trouble Code (DTC) | Is any other DTC displayed- | Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC) | Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference. |
7.CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR. | Is the ABS wheel speed sensor installation bolt tightened to 7.5 N·m (0.76 kgf-m, 5.5 ft-lb)- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL | Tighten the ABS wheel speed sensor installation bolts. |
8.CHECK ABS WHEEL SPEED SENSOR SIGNAL. 1) Prepare an oscilloscope. 2) Check the ABS wheel speed sensor. Front ABS Wheel Speed Sensor > INSPECTION | Does the oscilloscope indicate the waveform pattern like shown in the figure when the tire is slowly turned- Does the oscilloscope indication repeat the waveform pattern like shown in the figure when the tire is slowly turned in equal speed for one rotation or more- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
9.CHECK ABS WHEEL SPEED SENSOR OR MAGNETIC ENCODER. | Are there foreign matter, breakage or damage at the tip of ABS wheel speed sensor or magnetic encoder- | Remove dirt thoroughly. Also replace the ABS wheel speed sensor or magnetic encoder as a unit with hub unit bearing if it is broken or damaged. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
10.CHECK CAUSE OF SIGNAL NOISE. Make sure the radio wave devices and electronic components are installed correctly. | Are the radio wave devices and electronic components installed correctly- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL | Install the radio wave devices and electronic components properly. |
11.CHECK CAUSE OF SIGNAL NOISE. Check if the noise sources (such as an antenna) are installed near the sensor harness. | Are noise sources installed- | Install the noise sources apart from sensor harness. | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
12.CHECK VDCCM&H/U. 1) Connect all connectors. 2) Perform the Clear Memory Mode. Clear Memory Mode 3) Perform the Inspection Mode. Inspection Mode 4) Read the DTC. Read Diagnostic Trouble Code (DTC) | Is the same DTC displayed- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL |
13.CHECK FREEZE FRAME DATA OF ABS WHEEL SPEED SENSOR USING SUBARU SELECT MONITOR. 1) Using the Subaru Select Monitor, select “Freeze Frame Data”. Subaru Select Monitor > OPERATION 2) Read the ABS wheel speed sensor output. | Is the ABS wheel speed sensor output different compared with other wheels- | Replace the ABS wheel speed sensor which has a difference. Front ABS Wheel Speed Sensor Rear ABS Wheel Speed Sensor | Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) |
14.CHECK DETECTION OF OTHER DTCS FOR VDC. Read Diagnostic Trouble Code (DTC) | Is any other DTC displayed- | Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC) | Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference. NOTE: Though the ABS warning light may remain on at this time, this is normal. Drive the vehicle at 40 km/h (25 MPH) or more in order to turn ABS warning light off. Be sure to drive the vehicle and check that the warning light goes off. |
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