Toyota Hilux Surf 1993 Owner's Manual page 387

AT–190
Trouble No.4 No lock–up (After warm–up)
Warm up engine
Engine coolant temp.: 80
ATF temp.: 50–80 C (122–176
E
Road test
Connect a voltmeter to data link connector 1
terminals T and El. Is there 7, 5 or 3 V in the
T
lock–up position while driving?
Is voltage between ECM STP and E ,
terminals as follows?
Brake pedal depressed: 10–14 V
Brake pedal released: 0 V
Yes
Faulty throttle position signal
AUTOMATIC TRANSMISSION
C (176 F)
E E
F)
E
– Troubleshooting (Electronic Control System)
• Lock–up solenoid stuck
Yes
• Faulty transmission
• Faulty lock–up mechanism
Faulty brake signal