Toyota Hilux Surf 1993 Owner's Manual page 321

AT–124
Trouble No.2
Shift point too high or too low
Warm up engine
Engine coolant temp.: 80
ATF temp.: 50–80 C
E
(122–176 F)
E
Connect a voltmeter to data link connector 1
terminals TT and E, .
Does TT terminal voltage vary with changes
in throttle opening?
Yes
Check voltage between ECM terminals P and
El.
Power pattern: 10–14 V
Normal pattern: 0–2 V
AUTOMATIC TRANSMISSION
C (176 F)
E E
Is voltage between ECM terminals STP and
E, as follows?
0 V: Brake pedal released
10–14 V: Brake pedal depressed
Yes
• Throttle position signal faulty
• TT terminal wire open or short
– Troubleshooting (Electronic Control System)
• Faulty ECM
• Faulty transmission
Faulty pattern select switch system
Brake signal faulty