Which terminals are used to test the idle switch on a 1992 Geo Metro (M/T)?

Per the diagram, the Idle Switch is identified across terminals "B" and "A" of the throttle switch.

Which terminals correspond to the wide open throttle switch?

The Wide Open Switch is identified across terminals "C" and "B" of the throttle switch.

What tool is shown for testing the throttle switch?

An ohmmeter (shown with Ω symbol and + / − leads) is connected to the throttle switch terminals to test it.

What vehicle and transmission does this throttle switch diagram apply to?

It is labeled for the 1992 Geo Metro with manual transmission ('Throttle Switch Terminal ID (Metro M/T)'), courtesy of General Motors Corp.

What is the source of this service information?

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1992 Geo Metro Throttle Switch Terminal ID (M/T) - Idle & WOT Switch Test

1992 Geo Metro throttle switch terminal ID test with ohmmeter showing A, B, C terminals

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Service-manual figure showing throttle switch terminal identification and ohmmeter test points for a 1992 Geo Metro.

AI caption June 2007 · Photo 402 of 1553

This document is page 2 of a Mitchell Repair Information (© 2005) service procedure excerpt for the 1992 Geo Metro, from the section 'I - System/Component Tests, 1992 Engine Performance, Geo System & Component Testing.' It contains a single illustration (figure reference 90H18009), captioned 'Fig. 3: Throttle Switch Terminal ID (Metro M/T),' courtesy of General Motors Corp. The diagram identifies the three terminals of the throttle switch on a manual-transmission Geo Metro: terminal "A," terminal "B," and terminal "C." A small schematic shows that the Wide Open (throttle) Switch is measured across terminals "C" and "B," while the Idle Switch is measured across terminals "B" and "A." The illustration also shows an ohmmeter connected with its positive and negative leads to the switch terminals, indicating that the throttle switch is tested by measuring resistance/continuity between these terminals. The page footer shows it was printed by 'Five Star Automotive Repair' on June 08, 2007. Readers can learn the terminal identification and ohmmeter hookup needed to test the idle switch and wide-open throttle switch on a 1992 Geo Metro with manual transmission. Note: although filed under a 2000 Ford E350 gallery, the document explicitly applies to the 1992 Geo Metro.

This document covers 1992, which may differ from this 2000 Ford E350.

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Frequently asked questions

Which terminals are used to test the idle switch on a 1992 Geo Metro (M/T)?: Per the diagram, the Idle Switch is identified across terminals "B" and "A" of the throttle switch.
Which terminals correspond to the wide open throttle switch?: The Wide Open Switch is identified across terminals "C" and "B" of the throttle switch.
What tool is shown for testing the throttle switch?: An ohmmeter (shown with Ω symbol and + / − leads) is connected to the throttle switch terminals to test it.
What vehicle and transmission does this throttle switch diagram apply to?: It is labeled for the 1992 Geo Metro with manual transmission ('Throttle Switch Terminal ID (Metro M/T)'), courtesy of General Motors Corp.
What is the source of this service information?: The page is from Mitchell Repair Information Company, LLC (© 2005), printed June 08, 2007, page 2, with the illustration courtesy of General Motors Corp.