Throttle Position Sensor (TPS)

Measure total and variable resistance between specified TPS connector terminals. See TPS TEST TERMINALS table. Total resistance should be 3500-6500 ohms. Variable resistance should change smoothly between 3500 and 6500 ohms as throttle valve is moved from closed to wide open throttle.

TPS TEST TERMINALS

Application		Terminals No.
Total Resistance
Eclipse 1.8L		1 & 2
Eclipse 2.0L		2 & 3
All Others		1 & 4
Variable Resistance
Colt Vista, Expo, Montero, Pickup 3.0L, Precis, Ram-50 3.0L & Summit Wagon		1 & 3
Eclipse 1.8L		2 & 3
Eclipse 2.0L		3 & 4
All Others		2 & 4

VEHICLE SPEED SENSOR CONTINUITY TEST ⁽¹⁾

Application

⁽²⁾ Continuity

All Models

4 Changes Per Revolution

⁽¹⁾	Measure continuity at back of speedometer. See appropriate wiring diagram in WIRING DIAGRAMS article in this section.

⁽²⁾	With ECM connector disconnected, turn speedometer cable to cycle reed switch on and off.

VEHICLE SPEED SENSOR VOLTAGE TEST ⁽¹⁾

Application

⁽²⁾ Volts

All Models

Ignition Switch Off

1 Or Less

Ignition Switch On

4.5-4.9

⁽¹⁾	Measure voltage at back of speedometer. See appropriate wiring diagram in WIRING DIAGRAMS article in this section.

⁽²⁾	With ECM connector disconnected, turn speedometer cable to cycle reed switch on and off.