Tt Terminal Voltage Inspection (A340H) - Toyota Hilux Surf 1993 Owner's Manual

AT–128
AUTOMATIC TRANSMISSION
INSPECTION OF TT TERMINAL VOLTAGE
1. INSPECT THROTTLE POSITION SENSOR SIGNAL
(a) Turn the ignition switch to ON. Do not start the en–
(b) Connect a voltmeter to data link connector 1 termi–
(c) While slowly depressing the accelerator pedal,
2. INSPECT BRAKE SIGNAL
(a) Depress the accelerator pedal until the TT terminal
(b) Depress the brake pedal and check the voltage read–
If not as indicated, there is a malfunction in either the
3. INSPECT EACH UP–SHIFT POSITION
(a) Warm up the engine.
Engine Coolant temperature: 800C (1760F)
(b) Turn the O/D switch to "ON".
(c) Place the pattern select switch in "Normal" and the
(d) During a road test (above 10 km/h or 6 mph)check
If the voltage rises from 0 V to 7 V in the sequence
shown, the control system is okay.
The chart on the left shows the voltmeter reading and
corresponding gears.
HINT: Determine the gear position by a light shock or
change in engine rpm when shifting. The lock–up clutch
will turn ON only infrequently during normal 2nd and 3rd
gear operation. To trigger this action, press the accelera–
tor pedal to 50% or more of its stroke. At less than 50%,
the voltage may change in the sequence 2 V–4 V–6
V–7V.
– Troubleshooting (Electronic Control System)
gine.
nals Tt and E,.
check that TT terminal voltage rises in sequence.
If the voltage does not change in proportion to the throt–
tle opening angle, there is a malfunction in the throttle
position sensor or circuit.
indicates 8 V.
ing from the TT terminal.
Brake pedal depressed ................... 0 V
Brake pedal released ...................... 8 V
stop light switch or circuit.
shift lever into the D position.
that voltage at the TT terminal is as indicated below
for each up–shift position.