Throttle position switches

^ The full throttle switch is used for full throttle enrichment. The switch signals the ECM when the throttle is fully opened.

A separate idle switch is used for the closed throttle signal. The closed throttle signal is also used for idle speed control and deceleration fuel cutoff.

Both throttle position switches are mounted on the throttle housing and can be tested with the throttle housing installed.

— Before testing full throttle or idle switch, check that each is receiving reference voltage signal (5 VDC) from ECM.

• Disconnect harness plugs. With ignition on, there should be 5 VDC between plug terminals.

• If voltage is not present, test ECM harness output as described earlier.

Idle position switch

Full throttle iswitch

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