Symptoms - Automatic Transmission

Follow the symptoms and possible causes in table 1 before using table 2.

Step 1 - Diagnostic Vehicle Repair Matrix

Symptom	Possible Cause
Shift Shock
Large Shock (N → D position)	Engine system CAN communication line (U1000) Transmission range switch (P0705, P0706) CVT fluid temperature sensor (P0711, P0712, P0713) Torque converter clutch solenoid valve (P0740, P0743, P0744) CVT position Control valve CVT fluid level and state
Large Shock (N→ R position)	Engine system CAN communication line (U1000) Transmission range switch (P0705, P0706) CVT fluid temperature sensor (P0711, P0712, P0713) Torque converter clutch solenoid valve (P0740, P0743, P0744) CVT position Control valve CVT fluid level and state
Shock is too large for lock-up	Engine system CAN communication line (U1000) Torque converter clutch solenoid valve (P0740, P0743, P0744) Torque converter clutch solenoid valve (P0740, P0743, P0744) CVT position Control valve CVT fluid level and state
Slips/Will Not Engage
Vehicle cannot be started from D position	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
Vehicle cannot be started from R position	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
Does not lock-up	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Transmission range switch (P0705, P0706) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Torque converter clutch solenoid valve (P0740, P0743, P0744) Stall test Control valve CVT fluid level and state
Does not hold lock-up condition	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Transmission range switch (P0705, P0706) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Torque converter clutch solenoid valve (P0740, P0743, P0744) Stall test Control valve CVT fluid level and state
Lock-up is not released	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Torque converter clutch solenoid valve (P0740, P0743, P0744) Stall test Control valve CVT fluid level and state
With selector lever in D position, acceleration is extremely poor	Engine system CAN communication line (U1000) Transmission range switch (P0705, P0706) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
With selector lever in R position, acceleration is extremely poor	Engine system CAN communication line (U1000) Transmission range switch (P0705, P0706) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
Slips at lock-up	Engine system CAN communication line (U1000) Transmission range switch (P0705, P0706) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Torque converter clutch solenoid valve (P0740, P0743, P0744) Stall test Control valve CVT fluid level and state
Other
No creep at all	Engine system CAN communication line (U1000) Transmission range switch (P0705, P0706) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
Vehicle cannot run in any position	Engine system Transmission range switch (P0705, P0706) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
With selector lever in D position, driving is not possible	Engine system Transmission range switch (P0705, P0706) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
With selector lever in R position, driving is not possible	Engine system Transmission range switch (P0705, P0706) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT Fluid Temperature Sensor (P0711, P0712, P0713) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Stall test CVT position Power supply Control valve CVT fluid level and state
Shudder occurs during lock-up	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) Torque converter clutch solenoid valve (P0740, P0743, P0744) Control valve CVT fluid level and state
Strange noise in D, N, or R position	Engine system CAN communication line (U1000) Control valve CVT fluid level and state
Vehicle does not decelerate by engine brake	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) CVT position Control valve CVT fluid level and state
Maximum speed low	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Output Speed Sensor (P2765) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Torque converter clutch solenoid valve (P0740, P0743, P0744) Stall test Control valve CVT fluid level and state
With selector lever in P position, vehicle does not enter parking condition or, with selector lever in another position, parking condition is not cancelled	Transmission range switch (P0705, P0706) CVT position
Vehicle drives with CVT in P or N position	Transmission range switch (P0705, P0706) CVT position Control valve CVT fluid level and state
Engine stall	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Primary Pressure Sensor (P084C, P084D) Secondary Pressure Sensor (P0841, P0847, P0848) Torque converter clutch solenoid valve (P0740, P0743, P0744) Stall test Control valve CVT fluid level and state
Engine stalls when selector lever shifted N → D or R	Engine system CAN communication line (U1000) Input Speed Sensor (P0717) Primary Speed Sensor (P0715) Torque converter clutch solenoid valve (P0740, P0743, P0744) Control valve CVT fluid level and state
Engine speed does not return to idle	Engine system CAN communication line (U1000) Output Speed Sensor (P2765) Control valve CVT fluid level and state
Engine does not start in N or P position	Transmission range switch (P0705, P0706) CVT position Ignition switch and starter

Step 2 - Diagnostic Vehicle Repair Matrix

Symptom	Possible Cause
Shift Shock
Large Shock (N → D position)	Transmission range switch Forward clutch
Large Shock (N→ R position)	Transmission range switch Forward clutch
Shock is too large for lock-up	Torque Converter
Slips/Will Not Engage
Vehicle cannot be started from D position	Transmission range switch Oil pump Forward clutch
Vehicle cannot be started from R position	Transmission range switch Oil pump Reverse brake Parking mechanism
Does not lock-up	Torque converter Transmission range switch Oil Pump
Does not hold lock-up condition	Torque converter Transmission range switch Oil Pump
Lock-up is not released	Torque converter Oil Pump
With selector lever in D position, acceleration is extremely poor	Torque converter Transmission range switch Forward clutch
With selector lever in R position, acceleration is extremely poor	Torque converter Transmission range switch Oil Pump Reverse brake
Slips at lock-up	Torque converter Oil Pump
Other
No creep at all	Torque converter Transmission range switch Oil Pump Forward clutch Reverse brake Planetary gear
Vehicle cannot run in any position	Torque converter Oil Pump Forward clutch Reverse brake Planetary gear Parking mechanism
With selector lever in D position, driving is not possible	Torque converter Oil Pump Forward clutch Planetary gear Parking mechanism
With selector lever in R position, driving is not possible	Torque converter Oil Pump Reverse brake Planetary gear Parking mechanism
Shudder occurs during lock-up	Torque converter
Strange noise in D position	Torque converter Oil Pump Forward clutch Planetary gear Bearings
Strange noise in N position	Torque converter Oil Pump Planetary gear
Strange noise in R position	Torque converter Oil Pump Reverse brake Planetary gear
With selector lever in P position, vehicle does not enter parking condition or, with selector lever in another position, parking condition is not cancelled	Parking mechanism
Maximum speed low	Torque converter Transmission range switch Oil pump Forward clutch Planetary gear
Vehicle drives with CVT in P position	Planetary gear Parking mechanism
Vehicle drives with CVT in N position	Forward clutch Reverse brake Planetary gear
Engine stall	Torque converter
Engine stalls when selector lever shifted N → D or R	Torque converter
When brake pedal is depressed with ignition switch ON, selector lever cannot be shifted from P position to other position	Stop lamp switch Shift lock solenoid CVT shift selector
When brake pedal is NOT depressed with ignition switch ON, selector lever CAN be shifted from P position to other position	Stop lamp switch Shift lock solenoid CVT shift selector