Subaru Crosstrek Service Manual: Dtc c1242 rear left abs sensor signal

DTC detecting condition:

• Defective ABS wheel speed sensor signal (noise, irregular signal, etc.)

• Defective harness connector

• ABS does not operate.

• VDC does not operate.

• Hill start assist does not operate.

1.CHECK ABS WHEEL SPEED SENSOR AND FREEZE FRAME DATA USING SUBARU SELECT MONITOR.

1) Using the Subaru Select Monitor, check the freeze frame data when DTC is detected. Subaru Select Monitor > OPERATION">

2) Compare «FR Wheel Speed», «FL Wheel Speed», «RR Wheel Speed» and «RL Wheel Speed» to determine a sensor that is not indicating the same value.

3) Check the current data of the wheel speed sensor that is not indicating the same value. Subaru Select Monitor > OPERATION">

Does the speed indicated on the data monitor change in response to the speedometer reading during acceleration/deceleration when the steering wheel is in the straight-ahead position? In addition, are the wheel speeds 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">Go to Step 2.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL">Go to Step 7.

2.CHECK POOR CONTACT OF CONNECTOR.

1) Turn the ignition switch to OFF.

2) Check for poor contact of the connector between VDCCM&H/U and ABS wheel speed sensor.

Is there poor contact of connectors between VDCCM&H/U and ABS wheel speed sensor?

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL">Go to Step 3.

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">Go to Step 4.

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">Go to Step 5.

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 only. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) > REPLACEMENT">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL">Go to Step 6.

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 temporary poor contact in the harness and connector or a temporary 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">Go to Step 8.

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"> Rear 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">Go to Step 10.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL">Go to Step 9.

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">Go to Step 10.

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">Go to Step 11.

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">Go to Step 12.

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">Go to Step 13.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1242 REAR LEFT ABS SENSOR SIGNAL">Go to Step 14.

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 only. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) > REPLACEMENT">

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 temporary poor contact in the harness and connector or a temporary noise interference.

NOTE:

Though the ABS warning light may remain on at this time, this is normal. Drive the vehicle at 60 km/h (37 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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