DTC 0904

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 60°C (140°F)
- Vehicle speed is less than 64 km/h (40 MPH)
- During high-load operation




CONSULT REFERENCE VALUE IN DATA MONITOR MODE




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




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 at least 20 seconds continuously under the following conditions.

Engine speed: 1900 - 2500 rpm
Vehicle speed: 76 - 100 km/h (47 - 62 MPH)

OR

With GST
(1) Start engine and warm it up sufficiently.
(2) Select MODE 3 with GST.
(3) Perform test drive in "D" position at least 20 seconds continuously under the following conditions.

Engine speed: 1900 - 2500 rpm
Vehicle speed: 76 - 100 km/h (47 - 62 MPH)

OR

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

Engine speed: 1900 - 2500 rpm
Vehicle speed: 76 - 100 km/h (47 - 62 MPH)

(3) Stop the vehicle, turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(4) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.




DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Torque Converter Clutch Solenoid Valve




1. Check resistance between torque converter clutch solenoid valve terminals (1) and (3).

Resistance: Approximately 25 ohms [at 25°C (77°F)]

2. Remove torque converter clutch solenoid valve.




3. Supply the solenoid valve terminals (1) and (3) with battery voltage and check the solenoid valve operation.
Torque converter clutch solenoid valve should be operated.
4. If NG, replace torque converter clutch solenoid valve.

Torque Converter Clutch Control Valve
1. Disassemble torque converter clutch control valve assembly.




2. Check torque converter clutch control valve.
- Valve, and sleeve slide along valve bore under their own weight.
- Valve, and sleeve are free from burrs, dents and scratches.
- Control valve springs are free from damage, deformation and fatigue.
- Hydraulic line is free from obstacles.
3. If NG, replace torque converter clutch control valve