Subaru Crosstrek Service Manual: Dtc c0027 rear left abs sensor circuit open or short

DTC detecting condition:

• Defective ABS wheel speed sensor (broken wire, input voltage too high)

• Defective harness connector

• ABS does not operate.

• VDC does not operate.

• EyeSight does not operate.

1.CHECK POOR CONTACT OF CONNECTOR.

Check if there is poor contact between VDCCM&H/U and ABS wheel speed sensor.

Is there poor contact?

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 2.

2.CHECK HARNESS CONNECTOR BETWEEN VDCCM&H/U AND ABS WHEEL SPEED SENSOR (CHECK FOR OPEN CIRCUIT).

1) Turn the ignition switch to OFF.

2) Disconnect the connector (B310) from the VDCCM&H/U.

3) Disconnect the connector from ABS wheel speed sensor.

4) Measure the resistance between VDCCM&H/U connector and ABS wheel speed sensor connector.

Connector & terminal

DTC C0021

(B310) No. 6 — (B6) No. 1:
(B310) No. 5 — (B6) No. 2:

DTC C0023

(B310) No. 8 — (B15) No. 1:
(B310) No. 9 — (B15) No. 2:

DTC C0025

(B310) No. 12 — (R72) No. 1:
(B310) No. 11 — (R72) No. 2:

DTC C0027

(B310) No. 2 — (R73) No. 1:
(B310) No. 3 — (R73) No. 2:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 3.

Repair the harness connector between VDCCM&H/U and ABS wheel speed sensor.

3.CHECK GROUND SHORT OF HARNESS.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

DTC C0021

(B310) No. 6 — Chassis ground:

DTC C0023

(B310) No. 8 — Chassis ground:

DTC C0025

(B310) No. 12 — Chassis ground:

DTC C0027

(B310) No. 2 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 4.

Repair the harness connector between VDCCM&H/U and ABS wheel speed sensor.

4.CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT.

1) Connect the VDCCM&H/U connector.

2) Turn the ignition switch to ON.

3) Measure the voltage between ABS wheel speed sensor connector and chassis ground.

Connector & terminal

DTC C0021

(B6) No. 2 (+) — Chassis ground (−):

DTC C0023

(B15) No. 2 (+) — Chassis ground (−):

DTC C0025

(R72) No. 2 (+) — Chassis ground (−):

DTC C0027

(R73) No. 2 (+) — Chassis ground (−):

Is the voltage 5 — 16 V?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 6.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 5.

5.CHECK VDCCM&H/U POWER SUPPLY CIRCUIT.

1) Turn the ignition switch to OFF.

2) Disconnect the VDCCM&H/U connector.

3) Turn the ignition switch to ON.

4) Measure the voltage between VDCCM&H/U connector terminals.

Connector & terminal

(B310) No. 1 (+) — (B310) No. 26 (−):

(B310) No. 14 (+) — (B310) No. 26 (−):

(B310) No. 20 (+) — (B310) No. 26 (−):

Is the voltage 10 — 15 V?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 6.

Check the generator, battery and VDCCM&H/U power supply circuit.

6.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 as shown in the figure?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 7.

Replace the ABS wheel speed sensor. Front ABS Wheel Speed Sensor"> Rear ABS Wheel Speed Sensor">

7.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 C0027 REAR LEFT ABS SENSOR CIRCUIT OPEN OR SHORT">Go to Step 8.

8.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.

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