1974 Models

Disconnect speedometer cable at transmission. Disconnect connector harness from computer. Using a 10 ohm resistor, connect positive lead of ohmmeter to computer connector speed sensor terminal. Connect negative ohmmeter lead to a known good ground.

Fig 1: 1976-77 Throttle Positioner System Test (Federal 2T-C Engine)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: 1976-77 Throttle Positioner System Test (All Except Federal 2T-C Engine)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Have an assistant turn speedometer cable by hand and count number of needle sweeps at ohmmeter. Four needle sweeps should occur for every one revolution of speedometer cable.

1974 SPEED SENSOR OPERATING RANGE

Application

Sensor On At MPH ⁽¹⁾

F Engine

13-41

2T-C Engine

Federal

31-41

California

Man. Trans.

16-41

Auto. Trans.

24-65

3K-C Engine

11-36

4M Engine

16-65

18R-C Engine

Federal

16-62

California

11-41

⁽¹⁾	Acceleration speeds given. Deceleration speeds are 31-9 MPH (26-9 MPH for California models).