Toyota CH-R Service Manual: Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance (P0841,P2829)

Toyota CH-R Service Manual / K114 Cvt / Continuously Variable Transaxle System / Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance (P0841,P2829)

DESCRIPTION

The ECM controls the secondary oil pressure based on the secondary oil pressure signal output by the oil pressure sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0841

Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance

Either one of the following conditions is met (1 trip detection logic):

  • When the requested oil pressure is 1.4 MPa (14.3 kgf/cm2, 203 psi) or more, the oil pressure sensor output is 0.5 MPa (5.1 kgf/cm2, 73 psi) or less for 2 seconds or more.
  • When the requested oil pressure is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less, the difference between the calculated primary pulley pressure and target primary pulley pressure is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more for 3 seconds or more.
  • Oil pressure sensor
  • ECM

Comes on

DTC stored

P2829

Pressure Control Solenoid "K" Performance or Stuck Off

One of the following conditions is met (1 trip detection logic):

  • When the requested oil pressure is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less, the oil pressure sensor output is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more for 3 seconds or more.
  • When the vehicle speed is less than 8 km/h (5 mph), the ratio of the transmission revolution sensor (NIN) output speed and transmission revolution sensor (NOUT) output speed exceeds a specified value for 0.2 seconds or more.
  • When the oil pressure sensor output is less than 0.283 MPa (2.9 kgf/cm2, 41 psi) and the target gear ratio is 2.0 or more, the actual gear ratio is less than 1.0 for 1.5 seconds or more.
  • Continuously variable transaxle assembly
  • ECM

Comes on

DTC stored
DTC Detection Condition Patterns (P0841):
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnostic Condition

The requested oil pressure value is 1.4 MPa (14.3 kgf/cm2, 203 psi) or more.

○

-

The requested oil pressure value is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less.

-

○

Malfunction Condition

The oil pressure sensor output value is 0.5 MPa (5.1 kgf/cm2, 73 psi) or less.

○

-

The difference between the calculated primary pulley pressure and target primary pulley pressure is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more.

-

○

Duration

2 seconds or more

3 seconds or more

Detection Logic

1 trip detection logic

1 trip detection logic

HINT:

This DTC is output when either of the above detection patterns is met.

DTC Detection Condition Patterns (P2829):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnostic Condition

The requested oil pressure value is 1.0 MPa (10.2 kgf/cm2, 145 psi) or less.

○

-

-

The vehicle speed is less than 8 km/h (5 mph).

-

○

-

The oil pressure sensor output value is less than 0.283 MPa (2.9 kgf/cm2, 41 psi) and the target gear ratio is 2.0 or more.

-

-

○

Malfunction Condition

The oil pressure sensor output value is 2.5 MPa (25.5 kgf/cm2, 363 psi) or more.

○

-

-

The ratio of the transmission revolution sensor (NIN) output speed and transmission revolution sensor (NOUT) output speed exceeds a specified value.

-

○

-

The actual gear ratio is less than 1.0.

-

-

○

Duration

3 seconds or more

0.2 seconds or more

1.5 seconds or more

Detection Logic

1 trip detection logic

1 trip detection logic

1 trip detection logic

HINT:

This DTC is output when any one of the above detection patterns is met.

MONITOR DESCRIPTION

The ECM checks for belt clamping high-pressure or low-pressure malfunctions. If a mechanical malfunction of the shift solenoid valve SLS or the oil pressure sensor is detected by the ECM, it illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0841: Oil pressure sensor / Rationality check

P2829: Belt clamping pressure liner solenoid (Shift solenoid valve SLS) / Functional check

Required sensors/Components
  • Oil pressure sensor
  • Continuously variable transaxle assembly (Shift solenoid valve SLS)

Frequency of operation

Continuous

Duration Conditions

P0841 (ON malfunction): 3 seconds

P0841 (OFF malfunction): 2 seconds

P2829 (ON malfunction):

  • Pattern 1: 2 seconds
  • Pattern 2: 0.2 seconds
  • Pattern 3: 1.5 seconds

P2829 (OFF malfunction): 3 seconds

MIL operation

1 driving cycle

Sequence of operation

None

TYPICAL MALFUNCTION THRESHOLDS

P0841 (ON malfunction) Condition (A):

All of the following conditions are met:

-

Target clamping pressure

Less than 1.0 MPa (10.2 kgf/cm2, 145 psi)

Actual clamping pressure

2.5 MPa (25.5 kgf/cm2, 363 psi) or more
P0841 (ON malfunction) Condition (B):
*: Calculated primary pulley pressure is calculated by value of Transmission Fluid Pressure Sensor "A" and actual gear ratio

Calculated primary pulley pressure*

- Target primary pulley pressure

2.0 MPa (20.4 kgf/cm2, 290 psi) or more
P0841 (OFF malfunction), P2829 (ON malfunction) Condition (A):

All of the following conditions are met:

-

Target clamping pressure

1.4 MPa (14.3 kgf/cm2, 203 psi) or more

Actual clamping pressure

Less than 0.5 MPa (5.1 kgf/cm2, 73 psi)
P2829 (ON malfunction) Condition (B):
*1: It is necessary 2 judgments / drive cycle

1st judgment ; temporary flag "ON"

2nd judgment ; pending fault code ON

Actual gear ratio*1

4 or more
P2829 (ON malfunction) Condition (C):

All of the following conditions are met:

-

Target gear ratio

2 or more

Actual gear ratio

Less than 1
P2829 (OFF malfunction) Condition (A):

All of the following conditions are met:

-

Target clamping pressure

Less than 1.0 MPa (10.2 kgf/cm2, 145 psi)

Actual clamping pressure

2.5 MPa (25.5 kgf/cm2, 363 psi) or more
P2829 (OFF malfunction) Condition (B):
*: Calculated primary pulley pressure is calculated by value of Transmission Fluid Pressure Sensor "A" and actual gear ratio

Calculated primary pulley pressure*

- Target primary pulley pressure

Less than 0.5 MPa (5.1 kgf/cm2, 73 psi)

CAUTION / NOTICE / HINT

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform a stall test if any wheel chocks are out of position.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.
  • The vehicle could begin moving suddenly, resulting in a serious accident.

NOTICE:

  • Perform initialization after replacing any parts related to the continuously variable transaxle system.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

  • Perform the universal trip to clear permanent DTCs.

    Click here

HINT:

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Perform the D position test in Road Test.

    Click here

  2. Check for DTCs again.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P0841 AND P2829)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(e) Read the DTCs using the Techstream.

HINT:

If any other DTCs besides P0841 or P2829 are output, perform troubleshooting for those DTCs first.

Result

Proceed to

Both DTC P0841 and P2829 are output

A

Only DTC P0841 is output

B

Only DTC P2829 is output

C

P0841 and/or P2829 and other DTCs are output

D
B

GO TO STEP 12

C

GO TO STEP 19

D

GO TO DTC CHART

A

2.

READ VALUE USING TECHSTREAM (A/T OIL PRESSURE)

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • Do not perform a stall test if any wheel chocks are out of position.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.

NOTICE:

  • This test must be performed after checking and confirming that the engine is normal.
  • Perform this test while the CVT fluid temperature is between 50 and 100°C (122 and 212°F).
  • Perform this test with the A/C off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • When performing the stall speed test more than once, make sure to wait 15 seconds or more between tests.
  • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

When the electric parking brake switch assembly is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1.

Powertrain > Engine and ECT > Active Test

Tester Display

Connect the TC and TE1

(g) Enter the following menus: Powertrain / Engine and ECT / Data List.

Powertrain > Engine and ECT > Data List

Tester Display

A/T Oil Pressure

(h) In accordance with the display on the Techstream, read the Data List.

Powertrain > Engine and ECT > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

A/T Oil Pressure

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.9 to 4.7 MPa (39.8 to 47.9 kgf/cm2, 566 to 682 psi): D position stall speed test
  • 3.7 to 4.9 MPa (37.7 to 50.0 kgf/cm2, 537 to 711 psi): R position stall speed test

-

Result

Proceed to

Data display is within Normal Condition range

A

Data display is not within Normal Condition range

B
B

GO TO STEP 4

A

3.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

4.

REPLACE OIL PRESSURE SENSOR

(a) Replace the oil pressure sensor.

Click here

NEXT

5.

CLEAR DTC

(a) Clear the DTCs.

Click here

Powertrain > Engine and ECT > Clear DTCs
NEXT

6.

PERFORM INITIALIZATION

NOTICE:

  • Performing Reset Memory will clear the learned value of the yaw rate and acceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform Reset Memory, yaw rate and acceleration sensor zero 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
    • Oil pressure sensor
    • Airbag sensor assembly (Yaw rate and acceleration sensor)
  • After performing Reset Memory, always perform yaw rate and acceleration sensor (deceleration sensor zero point) calibration first, and then CVT oil pressure calibration.
  • Always perform calibration with the vehicle on level ground (Inclination: 0 +/- 0.25°).
  • Do not shake or vibrate the vehicle during calibration.

(a) Using the Techstream, perform Reset Memory, deceleration sensor zero point calibration and CVT oil pressure calibration.

Click here

(b) Check for DTCs again.

Click here

NEXT

7.

CHECK DTC OUTPUT

(a) Perform a road test.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(f) Read the DTCs using the Techstream.

Result

Proceed to

DTC P0841 and/or P2829 is output

A

DTCs are not output

B
B

END
A

8.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

9.

PERFORM INITIALIZATION

NOTICE:

  • Performing Reset Memory will clear the learned value of the yaw rate and acceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform Reset Memory, yaw rate and acceleration sensor zero 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
    • Oil pressure sensor
    • Airbag sensor assembly (Yaw rate and acceleration sensor)
  • After performing Reset Memory, always perform yaw rate and acceleration sensor (deceleration sensor zero point) calibration first, and then CVT oil pressure calibration.
  • Always perform calibration with the vehicle on level ground (Inclination: 0 +/- 0.25°).
  • Do not shake or vibrate the vehicle during calibration.

(a) Using the Techstream, perform Reset Memory, deceleration sensor zero point calibration and CVT oil pressure calibration.

Click here

(b) Check for DTCs again.

Click here

NEXT

10.

CHECK DTC OUTPUT

(a) Perform a road test.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(f) Read the DTCs using the Techstream.

Result

Proceed to

DTC P2829 is output

A

DTCs are not output

B
B

END
A

11.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

  • When Not Using the Engine Support Bridge

    Click here

  • When Using the Engine Support Bridge

    Click here

NEXT

PERFORM INITIALIZATION

12.

READ VALUE USING TECHSTREAM (A/T OIL PRESSURE)

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • Do not perform a stall test if any wheel chocks are out of position.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.

NOTICE:

  • This test must be performed after checking and confirming that the engine is normal.
  • Perform this test while the CVT fluid temperature is between 50 and 100°C (122 and 212°F).
  • Perform this test with the A/C off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • When performing the stall speed test more than once, make sure to wait 15 seconds or more between tests.
  • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

When the electric parking brake switch assembly is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1.

Powertrain > Engine and ECT > Active Test

Tester Display

Connect the TC and TE1

(g) Enter the following menus: Powertrain / Engine and ECT / Data List.

Powertrain > Engine and ECT > Data List

Tester Display

A/T Oil Pressure

(h) In accordance with the display on the Techstream, read the Data List.

Powertrain > Engine and ECT > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

A/T Oil Pressure

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.9 to 4.7 MPa (39.8 to 47.9 kgf/cm2, 566 to 682 psi): D position stall speed test
  • 3.7 to 4.9 MPa (37.7 to 50.0 kgf/cm2, 537 to 711 psi): R position stall speed test

-

Result

Proceed to

Data display is within Normal Condition range

A

Data display is not within Normal Condition range

B
B

GO TO STEP 14

A

13.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

14.

REPLACE OIL PRESSURE SENSOR

(a) Replace the oil pressure sensor.

Click here

NEXT

15.

CLEAR DTC

(a) Clear the DTCs.

Click here

Powertrain > Engine and ECT > Clear DTCs
NEXT

16.

PERFORM INITIALIZATION

NOTICE:

  • Performing Reset Memory will clear the learned value of the yaw rate and acceleration sensor (deceleration sensor zero point calibration) and the CVT oil pressure (CVT oil pressure calibration). Make sure to perform Reset Memory, yaw rate and acceleration sensor zero 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
    • Oil pressure sensor
    • Airbag sensor assembly (Yaw rate and acceleration sensor)
  • After performing Reset Memory, always perform yaw rate and acceleration sensor (deceleration sensor zero point) calibration first, and then CVT oil pressure calibration.
  • Always perform calibration with the vehicle on level ground (Inclination: 0 +/- 0.25°).
  • Do not shake or vibrate the vehicle during calibration.

(a) Using the Techstream, perform Reset Memory, deceleration sensor zero point calibration and CVT oil pressure calibration.

Click here

(b) Check for DTCs again.

Click here

NEXT

17.

CHECK DTC OUTPUT

(a) Perform a road test.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(f) Read the DTCs using the Techstream.

Result

Proceed to

DTC P0841 is output

A

DTCs are not output

B
B

END
A

18.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

19.

READ VALUE USING TECHSTREAM (A/T OIL PRESSURE)

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • Do not perform a stall test if any wheel chocks are out of position.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.

NOTICE:

  • This test must be performed after checking and confirming that the engine is normal.
  • Perform this test while the CVT fluid temperature is between 50 and 100°C (122 and 212°F).
  • Perform this test with the A/C off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • When performing the stall speed test more than once, make sure to wait 15 seconds or more between tests.
  • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

When the electric parking brake switch assembly is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1.

Powertrain > Engine and ECT > Active Test

Tester Display

Connect the TC and TE1

(g) Enter the following menus: Powertrain / Engine and ECT / Data List.

Powertrain > Engine and ECT > Data List

Tester Display

A/T Oil Pressure

(h) In accordance with the display on the Techstream, read the Data List.

Powertrain > Engine and ECT > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

A/T Oil Pressure

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.9 to 4.7 MPa (39.8 to 47.9 kgf/cm2, 566 to 682 psi): D position stall speed test
  • 3.7 to 4.9 MPa (37.7 to 50.0 kgf/cm2, 537 to 711 psi): R position stall speed test

-

Result

Proceed to

Data display is within Normal Condition range

A

Data display is not within Normal Condition range

B
B

GO TO STEP 21

A

20.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

21.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

(a) Replace the continuously variable transaxle assembly.

  • When Not Using the Engine Support Bridge

    Click here

  • When Using the Engine Support Bridge

    Click here

NEXT

PERFORM INITIALIZATION

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