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.	○	-
Diagnostic Condition	The vehicle is being driven.	-	○
Malfunction Condition	The difference between the engine speed (NE) and input turbine speed (NT) is 25 rpm or less.	○	-
Malfunction Condition	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.

Drive the vehicle and confirm the lock-up on and off conditions according to Road Test.
Click here
Turn the ignition switch off.
Perform step (1) again.
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.

(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

GO TO DTC CHART

CLEAR DTC

(a) Clear the DTCs.

Click here

Powertrain > Engine and ECT > Clear DTCs

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.

(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).

CHECK FOR INTERMITTENT PROBLEMS

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

PERFORM INITIALIZATION

Shift Solenoid "G" Control Circuit Low (Shift Solenoid Valve SC) (P099B,P099C)

DESCRIPTION Based on the signal received by the shift solenoid valve SC, the ECM uses the shift solenoid valve SLU to control the forward and reverse clutch pressure. If there is an open or short ...

Acceleration Sensor Circuit (P1585)

DESCRIPTION The ECM determines the vehicle inclination based on a signal from the airbag sensor assembly (yaw rate and acceleration sensor). If a malfunction in the airbag sensor assembly (yaw ra ...

Other materials:

Toyota CH-R Owners Manual > Steps to take in an emergency: Fuel pump shut off system
To minimize the risk of fuel leakage when the engine stalls or when an airbag inflates upon collision, the fuel pump shut off system stops the supply of fuel to the engine. Follow the procedure below to restart the engine after the system is activated. Vehicles without a smart key system 1. T ...

Toyota CH-R Service Manual > Power Window Regulator Motor(for Front Door): Components
COMPONENTS ILLUSTRATION *A for Driver Side *B for Front Passenger Side *1 FRONT DOOR BELT SEAL *2 FRONT DOOR GLASS INNER WEATHERSTRIP *3 FRONT DOOR INSIDE HANDLE BEZEL PLUG ...