Frontier SE King Cab 4WD L4-2.4L (KA24DE) (1998)
Torque Converter Clutch Solenoid: Description and Operation
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 oft, A/T lock-up is operational.
Conditions for lock-up cancel:
Torque converter clutch solenoid valve is turned "ON" when;
-
Throttle valve is fully closed (during idling or deceleration)
-
Engine coolant temperature is below 40° C (104° F)
-
Engine is stopped
Conditions for lock-up operation:
-
Under 55 to 63 km/h (34 to 39 MPH) (2/8 throttle on flat road), lock-up does not operate even when the torque converter clutch solenoid valve
is "OFF".
-
Over 58 to 66 km/h (36 to 41 MPH) (2/8 throttle on flat road), lock-up should operate because the torque converter clutch solenoid valve is
"OFF".
To confirm vehicle lock-up, the torque converter clutch solenoid valve must be in operation ("ON" during idle and deceleration, and "OFF"
during acceleration) and engine speed should drop.
When the accelerator pedal is depressed (less than 2/8) in lock-up, the engine speed should not change abruptly. If there is a big jump in engine
speed, there will be no lock-up.
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (32) (ECM ground).
ON BOARD DIAGNOSIS LOGIC
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.