Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1721 yaw rate sensor

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc c1721 yaw rate sensor

DTC DETECTING CONDITION:

• A fault is detected if the sensor signal value is not correct.

• A fault is detected if the steering angle sensor signal / lateral G sensor signal change while the yaw rate sensor signal indicates a constant value.

• A fault is detected if the communication status of yaw rate sensor is abnormal.

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

• Hill hold does not function.

• EyeSight does not operate. (Models with EyeSight)

STEP	CHECK	YES	NO
1.INTERVIEW CUSTOMERS. Check if the vehicle ran the road with banks or sandy surface (which does not mean a dirt road).	Did the vehicle run the road with banks or sandy surface (which does not mean a dirt road)-	VDCCM&H/U may record DTC when the vehicle ran the road with banks or sandy surface (which does not mean a dirt road).	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1721 YAW RATE SENSOR
2.CHECK INSTALLATION OF VDCCM&H/U.	Is VDCCM&H/U installed properly without being tilted- Is the bracket deformation-free- Are the VDCCM&H/U installation bolts installed without missing or getting loose-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1721 YAW RATE SENSOR	Repair the defective part. • Install VDCCM&H/U properly. • Replace the bracket if faulty. • Tighten the VDCCM&H/U installation bolt. General Description > COMPONENT Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1721 YAW RATE SENSOR
3.CHECK OUTPUT OF YAW RATE & G SENSOR WITH SUBARU SELECT MONITOR. 1) Drive the vehicle on a flat road. 2) Park the vehicle straight. 3) Using the Subaru Select Monitor, select “Data monitor”. Subaru Select Monitor > OPERATION 4) Read the «Yaw Rate Sensor» displayed on display.	Is the reading indicated on monitor display −4 — 4 deg/s-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1721 YAW RATE SENSOR	Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)
4.CHECK OUTPUT OF STEERING ANGLE SENSOR WITH SUBARU SELECT MONITOR. 1) Drive the vehicle on a flat road. 2) Park the vehicle straight. 3) Using the Subaru Select Monitor, select “Data monitor”. Subaru Select Monitor > OPERATION 4) Read the «Steering Angle Sensor» displayed on display.	Is the reading indicated on monitor display −10 — 10°-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1721 YAW RATE SENSOR	Perform the centering adjustment of steering wheel.
5.CHECK VDCCM&H/U. 1) Turn the ignition switch to OFF. 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 C1721 YAW RATE SENSOR
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.

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Other materials:

Disassembly
NOTE:When replacing the coupling sleeve and synchronizer hub, replace them as a set. Because these must engage at the specified point, avoid disassembly as much as possible. If it is necessary to disassemble, mark the engaging points on the splines beforehand.1. Put vinyl tape around the main shaft ...