Shift Point Too High Or Too Low - Toyota Hilux Surf 1993 Owner's Manual

Shift point too high or too low

Trouble No.2
Warm up engine
Engine coolant temp.: 800C (1760F)
ATF temp.: 50–80E C (122–176E F)
Connect a voltmeter to data link connector 1
terminals TT and El. 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
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
AT–67
Brake signal
faulty