RM36D0EC _52 Drivetrain _138176 K121 CVT _0584691 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM C

K121 CVT CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM P07457F Pressure Control Solenoid "A" Actuator Stuck Off P076A7E Shift Solenoid "H" Control Actuator Stuck On P077571 Pressure Control Solenoid "B" Actuator Stuck P08CC7F Shift Solenoid "J" Control Actuator Stuck Off P08D57E Shift Solenoid "K" Control Actuator Stuck On P09149F Gear Shift Position Circuit "A" Range/Performance Stuck Off

DESCRIPTION

Using the current from the ECM, the shift solenoid valve SL1 controls the C1 clutch pressure and S1 synchronizer in accordance with the requested shift mode.

Using the current from the ECM, the shift solenoid valve SL2 controls the C2 clutch pressure in accordance with the requested shift mode.

By controlling the current, the ECM controls the shift solenoid valve SC1 and switches between forward driving control fluid pressure, and rearward driving control fluid pressure.

By controlling the current, the ECM controls the shift solenoid valve SC2 and switches the shift solenoid valve SL1 between the role of controlling the C1 clutch pressure and controlling the S1 synchronizer.

When the ECM requests the shift mode to be changed to gear mode, the C1 clutch is engaged and the input torque is transmitted to the 1st gear via the forward clutch drum.

When the ECM requests the shift mode to be changed to gear mode, the S1 synchronizer is engaged and input torque is transferred to the 1st gear.

When the ECM requests the shift mode to be changed to belt mode, the C2 clutch is engaged and the input torque is transmitted to the output shaft via the steel belt.

The shift stroke sensor detects the S1 synchronizer position using the magnet on the shift fork, and sends signals to the ECM.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P07457F	Pressure Control Solenoid "A" Actuator Stuck Off	Any of the following conditions are met (1-trip detection logic): · When the ECM commands the C1 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 200 rpm for 1 second or more. · When the ECM commands the S1 synchronizer to be engaged, the shift stroke sensor output value is less than 9.205 mm (0.362 in.) for 4 seconds or more. · It is detected 2 times that when the C1 clutch is engaged, the shift stroke sensor output value decreases by 2.2 mm (0.087 in.) within 1 second of a S1 synchronizer hold command from the ECM. · It is detected 2 times that when the C1 clutch is being engaged from release, the shift stroke sensor output value decreases by 3.1 mm (0.122 in.) within 1 second of a S1 synchronizer hold command from the ECM.	· Shift stroke sensor · Transmission valve body assembly (shift solenoid valve SL1, SL2, SC1, SC2 or SC3) · Continuously variable transaxle assembly	Comes on	Engine	B	SAE Code: P0746
P076A7E	Shift Solenoid "H" Control Actuator Stuck On	Any of the following conditions are met (1-trip detection logic): · When the ECM commands the C2 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NSS) and output shaft speed is more than 300 rpm for 2 seconds or more. · When the ECM commands the C1 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 200 rpm for 1 second or more. · When the oil pressure sensor output value is 0.4 MPa (4.1 kgf/cm², 58 psi) or more and the target gear ratio is less than 1.1, the actual gear ratio is 1.8 or more for 2 seconds or more.	· Transmission valve body assembly (shift solenoid valve SL1, SL2, SC1, SC2 or SC3) · Continuously variable transaxle assembly	Comes on	Engine	B	SAE Code: P076C
P077571	Pressure Control Solenoid "B" Actuator Stuck	Any of the following conditions are met (1-trip detection logic): · When the ECM commands the C2 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NSS) and output shaft speed is more than 300 rpm for 2 seconds or more. · When the ECM commands the C1 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 200 rpm for 1 second or more.	· Transmission valve body assembly (shift solenoid valve SL1, SL2, SC1, SC2 or SC3) · Continuously variable transaxle assembly	Comes on	Engine	B	SAE Code: P0776
P08CC7F	Shift Solenoid "J" Control Actuator Stuck Off	Any of the following conditions are met (1-trip detection logic): · When the ECM commands the C1 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 200 rpm for 1 second or more. · When the ECM commands the S1 synchronizer to be engaged, the shift stroke sensor output value is less than 9.205 mm (0.362 in.) for 4 seconds or more. · It is detected 2 times that when the C1 clutch is engaged, the shift stroke sensor output value decreases by 2.2 mm (0.087 in.) within 1 second of a S1 synchronizer hold command from the ECM. · It is detected 2 times that when the C1 clutch is being engaged from release, the shift stroke sensor output value decreases by 3.1 mm (0.122 in.) within 1 second of a S1 synchronizer hold command from the ECM.	· Shift stroke sensor · Transmission valve body assembly (shift solenoid valve SL1, SL2, SC1, SC2 or SC3) · Continuously variable transaxle assembly	Comes on	Engine	B	SAE Code: P08CD
P08D57E	Shift Solenoid "K" Control Actuator Stuck On	Any of the following conditions are met (1-trip detection logic): · When the ECM commands the C2 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NSS) and output shaft speed is more than 300 rpm for 2 seconds or more. · When the ECM commands the C1 clutch to be engaged, the difference between the signals from the transmission revolution sensor (NT) and (NC1) is more than 200 rpm for 1 second or more.	· Transmission valve body assembly (shift solenoid valve SL1, SL2, SC1, SC2 or SC3) · Continuously variable transaxle assembly	Comes on	Engine	B	SAE Code: P08D7
P09149F	Gear Shift Position Circuit "A" Range/Performance Stuck Off	Any of the following conditions are met (1-trip detection logic): · When the ECM commands the S1 synchronizer to be engaged, the shift stroke sensor output value is less than 9.205 mm (0.362 in.) for 4 seconds or more. · It is detected 2 times that when the C1 clutch is engaged, the shift stroke sensor output value decreases by 2.2 mm (0.087 in.) within 1 second of a S1 synchronizer hold command from the ECM. · It is detected 2 times that when the C1 clutch is being engaged from release, the shift stroke sensor output value decreases by 3.1 mm (0.122 in.) within 1 second of a S1 synchronizer hold command from the ECM.	· Shift stroke sensor · Transmission valve body assembly (shift solenoid valve SL1, SL2, SC1, SC2 or SC3) · Continuously variable transaxle assembly	Comes on	Engine	B	SAE Code: P0915

MONITOR DESCRIPTION

When the ECM requests the shift mode to be changed to gear mode, the shift solenoid valve SL1 and shift solenoid valve SC2 are turned ON and the C1 clutch is engaged. As a result, the transmission revolution sensor (NT) signal becomes equal to the transmission revolution sensor (NC1) signal.

By comparing the signals indicating the input shaft revolution (speed) and intermediate shaft (C1 clutch) revolution (speed), the ECM judges if the shift mode is gear mode or not.

When the ECM requests the shift mode to be changed to gear mode, if the difference between the transmission revolution sensor (NT) and (NC1) signals is more than 200 rpm, it determines that the shift solenoid valve SL1, SL2, SC1, SC2 or SC3 is malfunctioning, illuminates the MIL and stores this DTC.

HINT:: The C1 clutch operates by line pressure from the shift control valve SL1 when the shift control valve SC2 is ON, so if the shift control valves SC1 and SC3 that exist upstream of the shift control valve SC2 are stuck ON, a C1 clutch release malfunction occurs, resulting in the same malfunction.; If the shift solenoid SL2 is stuck ON, the line pressure from the shift control valve SL1 is cut off by the action of the clutch control valve of the C1 clutch, a C1 clutch release malfunction occurs.

When the ECM requests the shift mode to be changed to belt mode, the shift solenoid valve SL2 is turned ON and the C2 clutch is engaged. As a result, the secondary pulley speed becomes equal to the output shaft speed.

By comparing the secondary pulley revolution speed and output shaft revolution speed, the ECM judges if the shift mode is belt mode or not.

When the ECM requests the shift mode to be changed to belt mode, if the difference between the secondary pulley speed and output shaft speed is more than 300 rpm, it determines the shift solenoid valve SL2, SC1 or SC3 is malfunctioning, illuminates the MIL and stores this DTC.

HINT:: The C2 clutch operates by line pressure from shift control valve SL2, and if the shift control valves SC1 and SC3 that exist upstream of the shift control valve SL2 are stuck ON, a C2 clutch release malfunction occurs, resulting in the same malfunction.

When the shift solenoid valve SC2 turns ON, the shift solenoid valve SL1 controls the S1 synchronizer and moves it to the requested position according to the requested shift mode.

When the ECM detects that the S1 synchronizer is not in the appropriate position, it determines that the shift solenoid valve SL1, SC2 or shift stroke sensor is malfunctioning, illuminates the MIL and stores a DTC.

CONFIRMATION DRIVING PATTERN

CAUTION:: When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:: ·

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

·

When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR202304,999999,_52,_138176,_0584691,RM100000002AR3U,

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

Turn the ignition switch off and wait for 2 minutes or more.

Perform the D Position Shift Test inspection in Road Test. [*1]

Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>ROAD TEST202304,999999,_52,_138176,_0584691,RM100000002AR3O,

HINT:: [*1]: Normal judgment procedure.; The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

Stop the vehicle.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Input the DTC: P07457F, P076A7E, P077571, P08CC7F, P08D57E or P09149F.

Check the DTC judgment result.

GTS Display	Description
NORMAL	· DTC judgment completed · System normal
ABNORMAL	· DTC judgment completed · System abnormal
INCOMPLETE	· DTC judgment not completed · Perform driving pattern after confirming DTC enabling conditions
N/A	· Unable to perform DTC judgment · Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:: ·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

CAUTION / NOTICE / HINT

NOTICE:: ·

Perform the universal trip to clear permanent DTCs.

Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR202304,999999,_52,_138176,_0584691,RM100000002AR3U,

·

Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>PRECAUTION202304,202405,_52,_138176,_0584691,RM100000002AR3J,202405,202409,_52,_138176,_0584691,RM100000002JGMS,202409,999999,_52,_138176,_0584691,RM100000002NRH4,

·

Check that no DTCs are stored after performing initialization.

Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR202304,999999,_52,_138176,_0584691,RM100000002AR3U,

HINT:: If any DTCs other than P07457F, P076A7E, P077571, P08CC7F, P08D57E or P09149F are output, perform troubleshooting for those DTCs first.

PROCEDURE

1.CHECK DTC OUTPUT

Read the DTCs using the GTS.

Powertrain > Engine > Trouble Codes: 50001 372

Result:

Result	Proceed to
P09149F and only DTCs in the following table are output	A
Only DTCs in the following table are output	B
P076A7E and P281F71 are output	C
DTCs other than those listed above are output	D

Relevant DTC
P07457F	Pressure Control Solenoid "A" Actuator Stuck Off
P076A7E	Shift Solenoid "H" Control Actuator Stuck On
P077571	Pressure Control Solenoid "B" Actuator Stuck
P08CC7F	Shift Solenoid "J" Control Actuator Stuck Off
P08D57E	Shift Solenoid "K" Control Actuator Stuck On

2.INSPECT SHIFT STROKE SENSOR

3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SL1, SL2, SC1, SC2 and SC3)

GO TO DTC CHART (DTC P281F71)

Click hereDrivetrain>K121 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>P281F71202304,999999,_52,_138176,_0584691,RM100000002AR2J,P281F71

GO TO DTC CHART

2.INSPECT SHIFT STROKE SENSOR

Click hereDrivetrain>K121 (CVT)>SHIFT STROKE SENSOR>INSPECTION202304,999999,_52,_138176,_0579403,RM1000000029EMX,

Result:

Proceed to
OK
NG

3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SL1, SL2, SC1, SC2 and SC3)

REPLACE SHIFT STROKE SENSOR

Click hereDrivetrain>K121 (CVT)>SHIFT STROKE SENSOR>REMOVAL202304,202405,_52,_138176,_0579403,RM1000000029EMV,202405,202409,_52,_138176,_0579403,RM100000002LVKG,202409,999999,_52,_138176,_0579403,RM100000002NGJ7,

3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SL1, SL2, SC1, SC2 and SC3)

Pre-procedure1

Disconnect the transmission wire connector from the shift solenoid valves SL1, SL2, SC1, SC2 and SC3

HINT:: Click hereDrivetrain>K121 (CVT)>VALVE BODY ASSEMBLY>REMOVAL202304,202405,_52,_138176,_0579411,RM1000000029EOC,202405,202409,_52,_138176,_0579411,RM100000002LVKL,202409,999999,_52,_138176,_0579411,RM100000002NGJC,

Procedure1

Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the shift solenoid valve SL1 connector. Check that the valve moves and makes an operating sound.

0.385,2.01 0.802,2.344 true 1.083,2.354 1.5,2.021 true 2.563,0.646 2.917,0.646 true 3.969,1.146 4.292,1.385 true 2.542,1.771 2.823,1.583 true 2.51,2.5 2.792,2.313 true 2.333,1.042 2.927,1.042 true 2.156,0.104 2.469,0.26 0.313,0.156 10 false *1 2.365,1.76 2.583,1.917 0.219,0.156 10 true *2 0.208,1.24 0.521,1.396 0.313,0.156 10 false *a 0.229,1.896 0.385,2.094 0.156,0.198 10 false 2 1.552,1.896 1.708,2.094 0.156,0.198 10 false 1 1.146,3.156 1.604,3.354 0.458,0.198 10 false (+) 0.635,3.156 1.094,3.354 0.458,0.198 10 false (-) 4.771,0.177 5.083,0.333 0.313,0.156 10 false *b 6.208,1.865 6.667,2.063 0.458,0.198 10 false (+) 6.792,1.865 7.052,2.135 0.26,0.271 10 false (-) 2.365,0.573 2.677,0.729 0.313,0.156 10 false *5 4.344,1.396 4.656,1.552 0.313,0.156 10 false *6 2.344,2.479 2.563,2.635 0.219,0.156 10 true *3 2.156,0.958 2.354,1.156 0.198,0.198 10 false *4

*1	Transmission Valve Body Assembly	*2	Shift Solenoid Valve SL1
*3	Shift Solenoid Valve SL2	*4	Shift Solenoid Valve SC1
*5	Shift Solenoid Valve SC2	*6	Shift Solenoid Valve SC3
*a	Component without harness connected (Shift Solenoid Valve SL1 and SL2)	*b	Component without harness connected (Shift Solenoid Valve SC1, SC2 and SC3)

OK:: Valve moves and makes an operating sound.

Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the shift solenoid valve SL2 connector. Check that the valve moves and makes an operating sound.

OK:: Valve moves and makes an operating sound.

Connect a positive (+) lead from the battery to the terminal of the shift solenoid valve SC1 connector and a negative (-) lead to the shift solenoid valve SC1 body. Check that the valve moves and makes an operating sound.

OK:: Valve moves and makes an operating sound.

Connect a positive (+) lead from the battery to the terminal of the shift solenoid valve SC2 connector and a negative (-) lead to the shift solenoid valve SC2 body. Check that the valve moves and makes an operating sound.

OK:: Valve moves and makes an operating sound.

Connect a positive (+) lead from the battery to the terminal of the shift solenoid valve SC3 connector and a negative (-) lead to the shift solenoid valve SC3 body. Check that the valve moves and makes an operating sound.