Toyota Hilux Surf 1993 Owner's Manual page 323

AT–126
Trouble No. 4 No lock–up (After warm–up)
Warm up engine
Engine coolant temp.: 80E C(176E F)
ATF temp.: 50–80E C (1 22–176E F)
Road test
Connect a voltmeter to data link connector 1
terminals TT and E, . Is there 7, 5 or 3 V in
the lock–up position while driving?
Is voltage between ECM STP and E, termi–
nals as follows?
Brake pedal depressed: 10–14 v
Brake pedal released: 0 v
Is voltage between ECM terminals L4 and E,
as follows?
Transfer shift position H2 or H4: 10–14V
Transfer shift position L4: 0 v
• Faulty transfer position switch circuit
• Faulty transfer position switch
AUTOMATIC TRANSMISSION – Troubleshooting( Electronic Control System)
Yes
• Lock–up solenoid stuck
• Faulty transmission
• Faulty lock–up mechanism
Faulty brake signal
Yes
Faulty throttle position signal