Honda Civic manuals

Subaru Legacy Service Manual: Dtc c1971 clutch sensor

DTC DETECTING CONDITION:

A fault is detected if electrical malfunction is detected for clutch stroke sensor.

TROUBLE SYMPTOM:

Parking brake system does not operate.

WIRING DIAGRAM:

Vehicle dynamics control system Vehicle Dynamics Control System

STEPCHECKYESNO

1.CHECK OUTPUT OF CLUTCH STROKE SENSOR USING SUBARU SELECT MONITOR.

1) Using the Subaru Select Monitor, select “Data monitor”. Subaru Select Monitor > OPERATION

2) Read the «Clutch stroke sensor» displayed on the screen.

When the clutch pedal is operated, does the stroke sensor output value displayed on the screen change in accordance with the clutch pedal-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

2.CHECK HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from clutch stroke sensor.

3) Turn the ignition switch to ON.

4) Measure the voltage between clutch stroke sensor connector terminals.

Connector & terminal

(B501) No. 3 (+) — (B501) No. 5 (−):

Is the voltage 4.5 V or more-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

Repair the power supply circuit of clutch stroke sensor.

3.CHECK HARNESS (CHECK FOR OPEN CIRCUIT).

1) Turn the ignition switch to OFF.

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

3) Measure the resistance of harness between clutch stroke sensor and VDCCM&H/U connector.

Connector & terminal

(B501) No. 3 — (B310) No. 11:

(B501) No. 4 — (B310) No. 10:

(B501) No. 5 — (B310) No. 15:

Is the resistance less than 1 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

Repair the harness and connector between clutch stroke sensor and VDCCM&H/U connector.

4.CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance of harness between clutch stroke sensor and chassis ground.

Connector & terminal

(B501) No. 3 — Chassis ground:

(B501) No. 4 — Chassis ground:

(B501) No. 5 — Chassis ground:

Is the resistance 1 M- or more-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

Repair the ground short of harness between clutch stroke sensor and VDCCM&H/U connector.

5.CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).

1) Turn the ignition switch to ON.

2) Measure the voltage between clutch stroke sensor and chassis ground.

Connector & terminal

(B501) No. 3 (+) — Chassis ground (−):

(B501) No. 4 (+) — Chassis ground (−):

(B501) No. 5 (+) — Chassis ground (−):

Is the voltage less than 1 V-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

Repair short to power supply of harness between clutch stroke sensor and VDCCM&H/U connector.

6.CHECK CLUTCH STROKE SENSOR OUTPUT.

1) Connect all connectors.

2) Turn the ignition switch to ON.

3) Using an oscilloscope, check clutch stroke sensor output.

Connector & terminal

(B501) No. 4 (+) — Chassis ground (−):

Is there any output-
(Does a cyclic rectangular wave appear-)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

Replace the clutch stroke sensor.

7.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between VDCCM&H/U and clutch stroke sensor-

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1971 CLUTCH SENSOR

8.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Perform the Clear Memory Mode. Clear Memory Mode

3) 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 C1971 CLUTCH SENSOR

9.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.

Dtc u1433 invalid data received from eyesight
NOTE:Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure ...

Dtc u1235 lost communication with eyesight
NOTE:Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure ...

Other materials:

Preparation tool
1. SPECIAL TOOLILLUSTRATIONTOOL NUMBERDescriptionREMARKS — (Newly adopted tool)SUBARU SELECT MONITOR 4Used for setting of each function and troubleshooting for electrical system.NOTE:For detailed operation procedures of Subaru Select Monitor 4, refer to “Application help”.18252AA000CRA ...

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