Throttle Valve Switch

L-JETRONIC: TEST CHART

THROTTLE VALVE SWITCH

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Operate:

Accelerator in idle position.

Measure:

Function of idle contacts.

Value:

0 Ohms (continuity) between terminals 2 and 18 of ECU plug.

Deviation:

Infinite resistance: Throttle valve switch incorrectly adjusted. 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.

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Operate:

Accelerator fully depressed.

Measure:

Function of full load contacts.

Value:

0 Ohms (continuity) between terminals 3 and 18 of ECU plug.

Deviation:

Infinite resistance: Throttle valve switch 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.

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Note:

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