CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0715, P0717

DESCRIPTION

The ECM receives a signal from the turbine speed sensor (transmission revolution sensor (NT)) installed in the continuously variable transaxle to control the lock-up engagement pressure and forward and reverse clutch pressure.

The transmission revolution sensor (NT) detects the continuously variable transaxle input shaft speed and sends it to the ECM.

MONITOR DESCRIPTION

The turbine speed sensor detects the transaxle input shaft speed. The ECM determines the necessary gear ratio based on a comparison of the turbine speed sensor (input shaft speed) with the output speed sensor (output shaft speed).

When the output shaft speed is higher than the expected value and the input shaft speed is less than 300 rpm while driving with the shift lever in D, the ECM will conclude that there is a malfunction in the transmission revolution sensor (NT). The ECM will illuminate the MIL and store the DTC.

WIRING DIAGRAM

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (SPD (NT) AND NT SENSOR VOLTAGE)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

   4. Enter the following menus: Powertrain / Engine and ECT / Data List.

   5. In accordance with the display on the tester, read the Data List.

      Engine and ECT

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      SPD (NT)	Input turbine speed/ min.: 0 rpm max.: 12750 rpm	Lock-up on (After warming up engine): Input turbine speed (NT) equal to engine speed Lock-up off (Idling with shift lever in P or N): Input turbine speed (NT) nearly equal to engine speed Vehicle stopped with shift lever in R: 0 rpm	Data is displayed in increments of 50 rpm.
      NT Sensor Voltage	Input turbine speed (NT) sensor output voltage/ min.: 0 V max.: 5 V	Engine idling (Vehicle stopped with shift lever in P or N): Constantly changes between 0.8 to 1.6 V and 2.4 to 3.2 V	-

      Result

      Result	Proceed to
      Data display is not within Normal Condition range	A
      Data display is within Normal Condition range	B

   
   

   B

   REPLACE ECM Click here

   A

2. INSPECT TRANSMISSION REVOLUTION SENSOR (NT)

   
   

   1. Remove the transmission revolution sensor (NT) Click here.

      

   2. Connect the battery to the sensor as shown in the illustration.

   3. Wave a magnetic object left and right in front of the transmission revolution sensor (NT) tip (5 mm (0.197 in.) gap or closer) to change the high/low signals while measuring the current.

      Note

      Make sure to wave the magnetic object during the inspection. The current will not change without waving the magnetic object as indicated by the arrow in the illustration.

   4. Measure the current according to the value(s) in the table below.

      Standard Current
      Tester Connection Condition Specified Condition 1 - 2 Low signal 4 to 8 mA 1 - 2 High signal 12 to 16 mA

      Text in Illustration

      *1	Ammeter
      *2	Battery
      *a	Component without harness connected (Transmission Revolution Sensor (NT))
      *b	5 mm (0.197 in.) Gap or Closer

   
   

   NG

   REPLACE TRANSMISSION REVOLUTION SENSOR (NT) Click here

   OK

3. CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (NT) - ECM)

   
   

   1. Disconnect the B48 transmission revolution sensor (NT) connector.

   2. Disconnect the B22 (for LHD) or B23 (for RHD) ECM connector.

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

      Standard Resistance (Check for Open) (for LHD)
      Tester Connection Condition Specified Condition B48-1 - B22-125 (NTO) Always Below 1 Ω B48-2 - B22-126 (NTB) Always Below 1 Ω

      Standard Resistance (Check for Open) (for RHD)
      Tester Connection Condition Specified Condition B48-1 - B23-125 (NTO) Always Below 1 Ω B48-2 - B23-126 (NTB) Always Below 1 Ω

      Standard Resistance (Check for Short) (for LHD)
      Tester Connection Condition Specified Condition B48-1 or B22-125 (NTO) - Body ground Always 10 kΩ or higher B48-2 or B22-126 (NTB) - Body ground Always 10 kΩ or higher

      Standard Resistance (Check for Short) (for RHD)
      Tester Connection Condition Specified Condition B48-1 or B23-125 (NTO) - Body ground Always 10 kΩ or higher B48-2 or B23-126 (NTB) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. REPLACE ECM

   
   

   1. Replace the ECM Click here.

   
   

   NEXT

5. PERFORM INITIALIZATION

   Note

   
   

   • Performing reset memory will clear the learned values of both the yaw rate sensor (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:

     Replaced Part
     Continuously variable transaxle assembly ECM Skid control computer (w/o VSC) Oil pressure sensor Deceleration sensor (w/o VSC) Airbag sensor assembly (Yaw rate sensor) (w/ VSC)

   • After performing reset memory, always perform yaw rate sensor (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.

   • Always perform 0 point calibration with the vehicle on level ground.

   • Do not shake or vibrate the vehicle during 0 point calibration.

   
   

   1. Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration Click here.

   2. Check that no DTC is stored.

   
   

   NEXT

   END