Toyota CH-R Service Manual: Torque Converter Clutch Circuit Performance or Stuck OFF (P0741,P075B,P2757)

Toyota CH-R Service Manual / K114 Cvt / Continuously Variable Transaxle System / Torque Converter Clutch Circuit Performance or Stuck OFF (P0741,P075B,P2757)

DESCRIPTION

The ECM uses the shift solenoid valves SC and SL to switch control of the shift solenoid valve SLU between forward and reverse clutch control and lock-up control in response to driving conditions.

HINT:

If DTC P0741 is stored after the engine has stalled, the lock-up shift solenoid valve (shift solenoid valve SL) may be malfunctioning.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0741

Torque Converter Clutch Circuit Performance or Stuck OFF

One of the following conditions is met (2 trip detection logic):

  • When the ECM sends a lock-up OFF command and turns the shift solenoid valves SC and SL OFF, the difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less for 1 second or more.
  • When the ECM turns the shift solenoid valves SC and SL ON, the difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more for 1 second or more.
  • While the vehicle is driven, a lock-up ON command is sent, but lock-up control is not performed for 1 second or more.
  • Torque converter assembly
  • Continuously variable transaxle assembly

Comes on

DTC stored

P075B

Shift Solenoid "G" Performance or Stuck Off

One of the following conditions is met (2 trip detection logic):

  • When the ECM sends a lock-up ON command and turns the shift solenoid valves SC and SL ON, the difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less for 1 second or more.
  • When the ECM turns the shift solenoid valves SC and SL OFF, the difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more for 1 second or more.
  • While the vehicle is driven, a lock-up ON command is sent, but lock-up control is not performed for 1 second or more.
  • Torque converter assembly
  • Continuously variable transaxle assembly

Comes on

DTC stored

P2757

Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance or Stuck OFF

One of the following conditions is met (2 trip detection logic):

  • When the ECM sends a lock-up ON command and turns the shift solenoid valves SC and SLU OFF and SL ON, the difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less for 1 second or more.
  • While the vehicle is driven, a lock-up signal is turned ON, but the lock-up remains OFF for 1 second or more.
  • Torque converter assembly
  • Continuously variable transaxle assembly

Comes on

DTC stored

DTC Detection Condition Patterns (P0741):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnostic Condition

The ECM sends a lock-up OFF command and turns the shift solenoid valves SC and SL OFF.

-

-

The ECM turns the shift solenoid valves SC and SL ON.

-

-

The vehicle is being driven.

-

-

Malfunction Condition

The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

-

-

The difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more.

-

-

The lock-up ON command is sent, but lock-up control is not performed.

-

-

Duration

1 second or more

1 second or more

1 second or more

Detection Logic

2 trip detection logic

2 trip detection logic

2 trip detection logic

HINT:

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

DTC Detection Condition Patterns (P075B):
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnostic Condition

The ECM turns the shift solenoid valves SC and SL OFF.

-

-

The vehicle is being driven.

-

-

The ECM sends a lock-up ON command and turns the shift solenoid valves SC and SL ON.

-

-

Malfunction Condition

The difference between the input turbine speed (NT) and primary pulley speed (NIN) is 300 rpm or more.

-

-

The lock-up ON command is sent, but lock-up control is not performed.

-

-

The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

-

-

Duration

1 second or more

1 second or more

1 second or more

Detection Logic

2 trip detection logic

2 trip detection logic

2 trip detection logic

HINT:

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

DTC Detection Condition Patterns (P2757):
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnostic Condition

The ECM sends a lock-up ON command, and turns the shift solenoid valves SC and SLU OFF and SL ON.

-

The vehicle is being driven.

-

Malfunction Condition

The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.

-

The lock-up signal is turned ON, but the lock-up remains OFF.

-

Duration

1 second or more

1 second or more

Detection Logic

2 trip detection logic

2 trip detection logic

HINT:

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

MONITOR DESCRIPTION

When performing lock-up control (on/off) of the torque converter, the ECM compares the transmission revolution sensor (NT) speed and engine speed (NE) to detect mechanical malfunctions in the shift solenoid valves SL and SC.

If the torque converter does not lock-up while a lock-up ON command is being sent, the ECM detects a mechanical malfunction in the shift solenoid valve SLU.

When the rotating speeds are different, the ECM detects the problem, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0741: Torque Converter Clutch Solenoid (Shift Solenoid valve SL) / Functional check

P075B: Shift Solenoid "G" (Shift solenoid valve SC) / Functional check

P2757: Torque Converter Clutch Pressure Control Solenoid (Shift Solenoid valve SLU) / Functional check

Required sensors/Components

Continuously variable transaxle assembly

(Shift Solenoid valve SL, Shift solenoid valve SC, Shift Solenoid valve SLU)

Frequency of operation

Continuous

Duration Conditions

1 second

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL MALFUNCTION THRESHOLDS

P0741 (OFF malfunction) Condition (A), P075B (ON malfunction) Condition (A):

l Turbine speed - Input speed l

300 rpm or more

P0741 (OFF malfunction) Condition (B), P075B (ON malfunction) Condition (B), P2757 (OFF malfunction):

l Engine speed - Turbine speed l

250 rpm or more

P0741 (ON malfunction) Condition (A), P075B (OFF malfunction) Condition (A), P2757 (ON malfunction) Condition (A):

Duration time of engaging forward or reverse clutch when shifting from "N" to ("D" or "R") or shifting from "P" to "R"

0.496 seconds or less at shift "D" or "R"

P0741 (ON malfunction) Condition (B) and (C), P075B (OFF malfunction) Condition (B), P2757 (ON malfunction) Condition (C):

l Engine speed - Turbine speed l

Less than 25 rpm

P2757 (ON malfunction) Condition (B):

Time after following condition is met:

0.05 seconds or more

Engine speed

Less than 55 rpm

Once after Engine speed

400 rpm or more

CAUTION / NOTICE / HINT

NOTICE:

  • Perform initialization when parts related to the continuously variable transaxle are replaced.

    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. Drive the vehicle and confirm the lock-up on and off conditions according to Road Test.

    Click here

  2. Turn the ignition switch off.
  3. Perform step (1) again.
  4. Check for DTCs again.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P0741, P075B AND P2757)

(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 DTCs other than P0741, P075B or P2757 are output, perform troubleshooting for those DTCs first.

Result

Proceed to

Only DTC P0741, P075B and/or P2757 is output

A

P0741, P075B and/or P2757 and other DTCs are output

B

B

GO TO DTC CHART

A

2.

CLEAR DTC

(a) Clear the DTCs.

Click here

Powertrain > Engine and ECT > Clear DTCs
NEXT

3.

PERFORM DRIVE TEST

CAUTION:

Strictly observe posted speed limits, traffic laws and road conditions when performing the road test.

NOTICE:

  • This test must be conducted after checking and confirming that the engine is operating normally.
  • Perform this test while the CVT fluid temperature is between 50 and 100°C (122 and 212°F).
  • Perform the test with the A/C off.

HINT:

  • Lock-up control will not operate when the CVT fluid temperature is 40°C (104°F) or less and the vehicle speed is 60 km/h (37 mph) or less, or when the CVT fluid temperature is 5°C (41°F) or less.
  • Lock-up control will not operate when the engine coolant temperature is 35°C (95°F) or less.
  • The lock-up OFF vehicle speed may vary depending on the electrical load, and air conditioning and brake operations.

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed, SPD (NT), SPD (NIN), Lock Up, SL Solenoid Status and Solenoid (SC).

Powertrain > Engine and ECT > Data List

Tester Display

Engine Speed

SPD (NT)

SPD (NIN)

Lock Up

SL Solenoid Status

Solenoid(SC)

Powertrain > Engine and ECT > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed

Min.: 0 rpm

Max.: 16383 rpm

710 to 810 rpm: Idling

When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

SPD (NT)

Input turbine speed

Min.: 0 rpm

Max.: 12750 rpm

  • Input turbine speed (NT) equal to engine speed (NE): Lock-up ON (After warming up engine)
  • Input turbine speed (NT) nearly equal to engine speed (NE): Lock-up OFF (Idling with shift lever in P or N)
  • 0 rpm: Vehicle stopped with shift lever in R

Data is displayed in increments of 50 rpm.

SPD (NIN)

Primary pulley speed (NIN)

Min.: 0 rpm

Max.: 12750 rpm

  • 0 rpm: Vehicle stopped
  • Primary pulley speed (NIN) equal to engine speed (NE): Lock-up ON (After warming up engine)

Data is displayed in increments of 50 rpm.

Lock Up

Lock-up

OFF or ON

  • ON: Lock-up operating
  • OFF: Lock-up not operating

-

SL Solenoid Status

Shift solenoid valve SL status

OFF or ON

  • ON: Lock-up operating
  • OFF: Lock-up not operating

-

Solenoid(SC)

Shift solenoid valve SC status

OFF or ON

  • ON: For 1 second after moving shift lever from P to D or R, or N to D or R
  • ON: Lock-up ON to OFF
  • OFF: Engine idling

-

(e) Check the Data List while driving.

Result

Proceed to

When the lock-up condition is ON, the input turbine speed (NT) is lower than the engine speed (NE).

A

When the shift solenoid valves SC and SL are OFF, the input turbine speed (NT) is equal to the engine speed (NE).

When the shift solenoid valves SC and SL are ON, there is a large difference between the input turbine speed (NT) and the primary pulley speed (NIN).

When the lock-up condition is ON, the input turbine speed (NT) is equal to the engine speed (NE).

B

When the shift solenoid valves SC and SL are OFF, the input turbine speed (NT) is lower than the engine speed (NE).

When the shift solenoid valves SC and SL are ON, the input turbine speed (NT) is equal to the primary pulley speed (NIN).

B

CHECK FOR INTERMITTENT PROBLEMS

A

4.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY AND TORQUE CONVERTER ASSEMBLY

(a) Replace the continuously variable transaxle assembly and torque converter assembly.

  • When Not Using the Engine Support Bridge

    Click here

  • When Using the Engine Support Bridge

    Click here

NEXT

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