A/T Does Not Perform Lock-Up
12. A/T Does Not Perform Lock-upSYMPTOM: A/T does not perform lock-up at the specified speed.
1. CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to A/T fluid temperature sensor, vehicle speed sensor A/T (revolution sensor), engine speed signal, torque converter clutch solenoid valve, or vehicle speed sensor MTR circuit after cruise test?
Yes or No
Yes >> Check torque converter clutch solenoid valve circuit.
Refer to DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT, DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR), DTC P0725 ENGINE SPEED SIGNAL, DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE, and DTC VHCL SPEED SEN MTR VEHICLE SPEED SENSOR MTR.
No >> GO TO 2.
2. CHECK THROTTLE POSITION SENSOR [ACCELERATOR PEDAL POSITION (APP) SENSOR]
Check throttle position sensor [Accelerator Pedal Position (APP) sensor]. Refer to DTC P0122, P0123 TP SENSOR.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace throttle position sensor [Accelerator Pedal Position (APP) sensor].
3. DETECT MALFUNCTIONING ITEM
1. Remove control valve.
2. Check the following items:
^ Torque converter clutch control valve
^ Torque converter relief valve
^ Pilot valve
^ Pilot filter
3. Remove A/T.
4. Check torque converter.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK SYMPTOM
Check again.
OK or NG
OK >> INSPECTION END
NG >>
1. Perform TCM input/output signal inspection. Pinout Values and Diagnostic Parameters
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.