DTC P0791-12: Intermediate Shaft Speed Sensor "A" Circuit Short to Battery; DTC P0791-14: Intermediate Shaft Speed Sensor "A" Circuit Short to Ground or Open; DTC P0791-31: Intermediate Shaft Speed Sensor "A" No Signal [12/2019 - 10/2022]: Procedure

1. Read the Data List according to the display on the GTS.

   Powertrain > Transmission > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   NC Sensor Speed	Counter gear speed	Min.: 0 rpm Max.: 12750 rpm	-	-
   NC Sensor Voltage	NC sensor voltage	Min.: 0.000 V Max.: 4.999 V	0.1 to 1.9 V: Engine idling	-

   Powertrain > Transmission > Data List 

   Tester Display
   NC Sensor Speed
   NC Sensor Voltage

   Result

   Result	Proceed to
   Data List values are normal	A
   Data List values are not normal	B

Result: 

A 

See step  5

Result: 

B 

See step  2

1. Disconnect the C51 transmission wire connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Transmission Wire)

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C51-21 (NCO) - Body ground	Always	99 to 101 Ω

3. Turn the ignition switch to ON.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   C51-22 (NCB) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. Disconnect the transmission revolution sensor (NC) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Transmission Wire
   *a	Transmission Revolution Sensor (NC) Side
   *b	Wire Harness Connector Side

   Refer to REMOVAL [12/2019 - 10/2022]

2. Disconnect the C51 transmission wire connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 (transmission revolution sensor (NC) side) - 22 (NCB) (wire harness connector side)	Always	Below 1 Ω
   2 (transmission revolution sensor (NC) side) - 21 (NCO) (wire harness connector side)	Always	Below 1 Ω
   1 (transmission revolution sensor (NC) side) or 22 (NCB) (wire harness connector side) - Body ground	Always	10 kΩ or higher
   2 (transmission revolution sensor (NC) side) or 21 (NCO) (wire harness connector side) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSMISSION REVOLUTION SENSOR (NC). Refer to  COMPONENTS [12/2019 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE TRANSMISSION WIRE. Refer to  COMPONENTS [12/2019 - 10/2022] 

1. Disconnect the C51 transmission wire connector.
2. Disconnect the C54 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C51-22 (NCB) - C54-73 (NCB)	Always	Below 1 Ω
   C51-21 (NCO) - C54-72 (NCO)	Always	Below 1 Ω
   C51-22 (NCB) or C54-73 (NCB) - Body ground	Always	10 kΩ or higher
   C51-21 (NCO) or C54-72 (NCO) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) 

Result: 

OK 

See step  5

1. Replace the ECM.

   Refer to COMPONENTS [12/2019 - 10/2022]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

PERFORM REGISTRATION. Refer to  REGISTRATION [12/2019 - 10/2022]