Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1242 rear left abs sensor signal

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc c1242 rear left abs sensor signal

DTC DETECTING CONDITION:

• A fault is detected if the time of decompression or hold exceeds the predetermined time.

• A fault is detected if noise of the wheel speed sensor signal is detected.

• A fault is detected if the wheel speed sensor signal is lost, or the wheel speed sensor signal continuously indicates significantly low speed by calculating the difference between maximum speed and minimum speed among the four wheels.

• A fault is detected if the wheel speed sensor signal continuously indicates excessively high or low speed.

• A fault is detected if the wheel speed sensor signal changes irregularly.

• A fault is detected if the wheel speed sensor signal drops cyclically.

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

• Hill hold does not function.

• EyeSight does not operate. (Models with EyeSight)

NOTE:

This DTC may be stored when the wheel speed sensor connector is disconnected regardless of the ignition switch condition (ON/OFF). Perform the Clear Memory Mode after diagnosis if a DTC is recorded. Clear Memory Mode

STEP	CHECK	YES	NO
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-	Repair the connector.	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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