CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:P0741, P075B, P2757

DTC Code	DTC Name
P0741	Torque Converter Clutch Circuit Performance or Stuck OFF
P075B	Shift Solenoid "G" Performance or Stuck Off
P2757	Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance or Stuck OFF

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.

Tech Tips

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 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

MONITOR DESCRIPTION

When performing lock-up control (on/off) of the torque converter, the ECM compares the transmission revolution sensor (NT) output 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 it as a mechanical malfunction of the shift solenoid valve SLU.

If the difference between the engine speed (NE) and transmission revolution sensor (NT) output speed or transmission revolution sensor (NIN) output speed and transmission revolution sensor (NT) output speed is outside of the threshold, the ECM detects the malfunction, illuminates the MIL and stores a DTC.

CAUTION / NOTICE / HINT

Note

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

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Check that no DTCs are stored after performing initialization.

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PROCEDURE

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

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read the DTCs using the GTS.

Tech Tips

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

Result

Result	Proceed to
Only DTC P0741, P075B and/or P2757 is output	A
DTC P0741, P075B and/or P2757 and other DTCs are output	B

GO TO DTC CHART Click here

CLEAR DTC

Clear the DTCs.

Result

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PERFORM DRIVE TEST

CAUTION:

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

Note

This test must be performed after checking and confirming that the engine is normal.
Perform this test with the CVT fluid temperature between 50 and 100°C (122 and 212°F).
Perform the test with the air conditioning off.

Tech Tips

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 30°C (86°F) or less.
The lock-up OFF vehicle speed may vary depending on the electrical load, and air conditioning and brake operations.

Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed, SPD (NT), SPD (NIN), Lock Up, SL Solenoid Status and Solenoid (SC).

According to the display on the GTS, read the Data List while driving.

Engine and ECT
Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Engine Speed	Engine speed	Min.: 0 rpm Max.: 16383 rpm	680 to 780 rpm: Idling with warm engine, shift lever in N, A/C off	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 (NT)	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 D	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	-

Result

Result	Proceed to
When Lock Up 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 Lock Up 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 Click here

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

Replace the continuously variable transaxle assembly and torque converter assembly.

Click here

Result

Proceed to
NEXT

PERFORM INITIALIZATION Click here