Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p2746 intermediate shaft speed sensor "b" circuit range/performance

Subaru Legacy BN/BS (2015-2019) Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2746 intermediate shaft speed sensor "b" circuit range/performance

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Standing start problems

• Shock occurs when engaging the lockup clutch.

• Shock occurs when selecting shift position.

1. ENGINE TYPE FB

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC using Subaru Select Monitor.	Besides DTC P2746, is DTC P2747 or P2751 displayed-	Perform the diagnosis according to DTCs other than P2746.	Perform the diagnosis according to DTC P2747. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2747 INTERMEDIATE SHAFT SPEED SENSOR "B" CIRCUIT NO SIGNAL

2. ENGINE TYPE EZ

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC using Subaru Select Monitor.	Besides DTC P2746, is any of the DTCs P2747, U0100 and U0401 displayed-	Perform the diagnosis according to DTCs other than P2746.	Perform the diagnosis according to DTC P2747. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2747 INTERMEDIATE SHAFT SPEED SENSOR "B" CIRCUIT NO SIGNAL

3. OUTLINE OF DIAGNOSIS (ENGINE TYPE FB)

Diagnosis 1

• Detect the malfunction of primary speed sensor signal characteristics.

• Judge as NG if the primary speed, compared with the speeds of other parts, is outside the possible range considering the hardware capabilities.

Diagnosis 2

• Detect the malfunction of primary speed sensor signal characteristics.

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

4. EXECUTION CONDITION (ENGINE TYPE FB)

Secondary Parameters	Execution condition
Diagnosis 1
12 V battery system voltage	≥ 9 V
Transmission range	Drive or Reverse
(Measured turbine shaft speed / Measured secondary pulley shaft speed)	≥ 0.4
	and
	≤ 2.55
Diagnosis 2
12 V battery system voltage	≥ 9 V
Transmission range	Drive or Reverse
(Measured turbine shaft speed / Measured secondary pulley shaft speed)	≥ 0.4
	and
	≤ 2.55

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
Diagnosis 1
(Measured primary pulley shaft speed / Measured secondary pulley shaft speed)	< 0.36
	or
	> 2.80
Diagnosis 2
Measured primary pulley shaft speed	> 7140 rpm

Time Needed for Diagnosis: 5 seconds

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

6. OUTLINE OF DIAGNOSIS (ENGINE TYPE EZ)

• Detect the malfunction of primary speed sensor signal characteristics.

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

7. EXECUTION CONDITION (ENGINE TYPE EZ)

Secondary Parameters	Execution condition
12 V battery system voltage	≥ 10 V
Engine speed	≥ 500 rpm

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
Measured primary pulley shaft speed	< Table 1 rpm

Table 1

Engine speed (rpm)	3700	3727	3755	3782	3856	4019	4213	4456
Measured primary pulley shaft speed (rpm)	0	500	1000	1500	2000	2500	3000	3500

Engine speed (rpm)	4786	5213	5651	6101	6569	7044	7520
Measured primary pulley shaft speed (rpm)	4000	4500	5000	5500	6000	6500	7000

Time Needed for Diagnosis: 10 seconds

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

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