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Old 09-29-2019, 03:10 PM   #10
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,608
 

2003 L-Series 3.0L Sedan
Default Re: Secondary air injection system

The air pump is just a blower motor using brushes no different from starters, blower motors and windshield wiper motors. They would eventually wear out; plain bearings, brushes and commutators. The best way to test the motor is direct wiring to the battery unless you're familiar with wiring circuits to use a jumper across the pump relay.

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