Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p2750 intermediate shaft speed sensor "c" circuit range/performance

Subaru Legacy BN/BS (2015-2019) Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2750 intermediate shaft speed sensor "c" circuit range/performance

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Shifting shock is felt.

• Acceleration is poor during standing start.

• Shift control malfunction

1. ENGINE TYPE FB

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC using Subaru Select Monitor.	Besides DTC P2750, is any of the DTC P2751, U0122 or U0416 displayed-	Perform the diagnosis according to DTCs other than P2750.	Perform the diagnosis according to DTC P2751. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2751 INTERMEDIATE SHAFT SPEED SENSOR "C" CIRCUIT NO SIGNAL

2. ENGINE TYPE EZ

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC using Subaru Select Monitor.	Besides DTC P2750, is DTC P2747 or P2751 displayed-	Perform the diagnosis according to DTCs other than P2750.	Perform the diagnosis according to DTC P2751. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2751 INTERMEDIATE SHAFT SPEED SENSOR "C" CIRCUIT NO SIGNAL

3. OUTLINE OF DIAGNOSIS (ENGINE TYPE FB)

• Detect the malfunction of the secondary speed sensor characteristics.

• Judge as NG if the deviation of vehicle speed between VDC and the secondary speed sensor becomes the predetermined value or more.

4. EXECUTION CONDITION (ENGINE TYPE FB)

Secondary Parameters	Execution condition
12 V battery system voltage	≥ 10 V
Vehicle speed (from vehicle dynamics control module)	≥ 5 MPH

5. DIAGNOSTIC METHOD (ENGINE TYPE FB)

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria	Threshold Value
\|Vehicle speed (calculated from secondary pulley shaft speed) − Vehicle speed (from vehicle dynamics control module)\|	> 10 MPH

Time Needed for Diagnosis: 5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

6. OUTLINE OF DIAGNOSIS (ENGINE TYPE EZ)

Diagnosis 1

• Detect the malfunction of secondary speed sensor signal characteristics.

• Judge as NG if the secondary speed, compared with the primary speed, is outside the possible range considering the hardware capabilities.

Diagnosis 2

• Detect the malfunction of secondary speed sensor signal characteristics.

• Judge as NG if the secondary speed exceeds the predetermined value.

7. EXECUTION CONDITION (ENGINE TYPE EZ)

Secondary Parameters	Execution condition
Diagnosis 1
12 V battery system voltage	≥ 9 V
Transmission range	Drive or Reverse
(Measured primary pulley shaft speed /Measured front output shaft speed)	≥ 0.36
	and
	≤ 2.34
Diagnosis 2
12 V battery system voltage	≥ 9 V
Transmission range	Drive or Reverse
(Measured primary pulley shaft speed /Measured front output shaft speed)	≥ 0.36
	and
	≤ 2.34

8. DIAGNOSTIC METHOD (ENGINE TYPE EZ)

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria	Threshold Value
Diagnosis 1
(Measured primary pulley shaft speed / Measured secondary pulley shaft speed)	< 0.33
	or
	> 2.58
Diagnosis 2
Measured secondary pulley shaft speed	> 10820 rpm

Time Needed for Diagnosis: 5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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