Transmission Control System

SYSTEM DESCRIPTION
The ECM controls torque converter clutch solenoid valve to cancel the lock-up condition of A/T. When the solenoid valve is turned on, lock-up is cancelled. When the solenoid valve is turned off, A/T lock-up is operational.

Conditions for lock-up cancel:
- Throttle valve is fully closed (idling or deceleration)
- Engine coolant temperature is below 40°C (104°F)




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECCS ground).




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
With CONSULT
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT.
(3) Start engine and warm it up sufficiently.
(4) Perform test drive in "D" position for at least 20 seconds continuously under the following conditions.

Engine speed: 2,000 - 2,700 rpm
Vehicle speed: 75 - 95 km/h (45 - 60 MPH)

OR

With GST
(1) Start engine and warm it up sufficiently.
(2) Perform test drive in "D" position for at least 20 seconds continuously under the following conditions.

Engine speed: 2,000 - 2,700 rpm
Vehicle speed: 75 - 95 km/h (45 - 60 MPH)

(3) Select MODE 7 with GST.

OR

NO TOOLS
(1) Start engine and warm it up sufficiently.
(2) Perform test drive in "D" position for at least 20 seconds continuously under the following conditions.

Engine speed: 2,000 - 2,700 rpm
Vehicle speed: 75 - 95 km/h (45 - 60 MPH)

(3) Stop the vehicle, turn ignition switch "OFF", wait at least 7 seconds and then turn "ON".
(4) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

EC-TCV-01-Torque Converter Clutch Solenoid Valve (DTC P1550):

WIRING DIAGRAM







DIAGNOSTIC PROCEDURE