Throttle Valve Switch

Function of idle contacts

• Put the accelerator in idle position.
• Measure the resistance between terminals 2 and 18 of ECU plug.

The resistance should be at 0 Ohms (continuity). If the resistance is infinite the throttle valve switch is incorrectly adjusted or an open circuit in cable (check cables). If direct reading at terminals 2 and 18 of throttle valve switch still gives infinite resistance, replace throttle valve switch.

Function of full load contacts

• Depress the accelerator fully.
• Measure the resistance between terminals 3 and 18 of ECU plug.

The resistance should be at 0 Ohms (continuity). If the resistance is infinite the throttle valve switch may be incorrectly adjusted or short circuit in cables. Pull plug from throttle valve switch. If meter at ECU plug still reads infinity, cable is defective. Otherwise adjust or replace throttle valve switch.

Note

Between idle and full load positions, resistance across throttle valve switch terminals is infinite.