Second Design OnOff Type Sensor

The second design sensor, which is used on many late model TCCS equipped engines, utilizes a dual position contact to switch an ECU reference voltage to ground. This switching action causes the signal at the ECU to go low whenever the switch contacts are closed.

Referring to the voltage graph, IDL signal voltage is low when the throttle is closed and goes high when the throttle exceeds a 1.5' opening. PSW voltage is high until the throttle opens to about 70'; then it goes low.

The three wire electrical connector terminals are identified as follows.

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Do It Yourself Car Diagnosis

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