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Originally Posted by jrmd01
Am I supposed to be testing the pin with the connector on?
Right now the connector is disconnected.
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Depends on the test....
You need to 'back probe' the connector when KOEO/KOER.
.Key On, Engine Off.
.Key On, Engine Running.
You should have a supply voltage to the MAS and a signal line to the ECU.and a ground too....Most MAS failures are due to poor grounds and dirty sensor wires/strips.
The way to check MAS operation is with a Digital Lab' Scope, usually a dual screen type.
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