Inspect Terminal Ect Voltage

1. Inspect the throttle position sensor system.

(a) Turn the ignition switch to ON. Do not start the engine.

(b) Connect a voltmeter to the DG terminal and body ground.

(c) While slowly depressing the accelerator pedal, check that DG terminal voltage rises in sequence.

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

Inspect brake signal.

(a) Depress the accelerator pedal to where DG terminal indicates 8V.

(b) Depress the brake pedal and check the voltage reading for DG terminal.

Brake pedal depressed ... OV Brake pedal released 8V

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

Inspect each up shift position.

(a) Warm up the engine. Coolant temperature: 80°C (176°F)

(c) Place the pattern select switch in "Normal" and the shift selector in "D" range.

(d) During a road test (above 10 km/h or 6 mph) check that voltage at the DG terminal is as indicated below for each up shift position.

Terminal ECT (V)

Gear position






2nd Lock-up




3rd Lock-up




OD Lock-up

(e) If voltage rises from OV to 7V in the sequence shown, the control system is okay.

(f) The voltage could rise anywhere between OV — 8V before the vehicle reaches 10 km/h or 6 mph in first gear. The voltage jump depends on what percent the throttle valve is opened. This is a normal reading.

Above 10 km/h or 6 mph, the voltmeter indicates the current gear.

NOTE: Determine the gear position by a light shock or change in engine rpm when shifting.

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