TT Terminal Circuit

TT TERMINAL VOLTAGE INSPECTION:

1. INSPECT THROTTLE POSITION SENSOR SIGNAL.
- Turn the ignition switch to ON.
Do not start the engine.



- Connect a voltmeter to DLC1 terminals TT and E1.
- While slowly depressing the accelerator pedal, check that TT terminal voltage rises in sequence.



- If the voltage does not change in proportion to the throttle opening angle, there is a malfunction in the throttle position sensor or circuit.

2. INSPECT BRAKE SIGNAL.
- Depress the accelerator pedal until the TT terminal indicates 8.0 Volts.
- Depress the brake pedal and check the voltage reacting from the TT terminal.

Brake pedal depressed: 0.0 Volts
Brake pedal released: 8.0 Volts

- If not as indicated, there is a malfunction in either the stop light switch or circuit.

3. INSPECT EACH UP-SHIFT POSITION.
- Warm up the engine.

Engine coolant temperature: 80°C (176°F)




- Turn the O/D main switch to ON.
- Place the pattern select switch in "Normal" and the shift lever into the D position.
- During a road test (about 10 km/h or 6 mph) check that voltage at the IT terminal is as indicated below for each up-shift position.
- If the voltage rises from 0.0 Volts to 7.0 Volts in the sequence shown, the control system is okay.
- The chart below shows the voltmeter reading and corresponding gears.




HINT: Determine the gear position by a light shock a change in engine RPM when shifting.