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Old 10-01-2019, 08:00 PM   #16
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,623
 

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

Go back to post#2 and read it again. There's a specific sequence taking place with the blower powering up first(?) to pressurize before blowing fresh air into the exhaust manifold. The air pump relay in the fuse panel must be must be energized to close a set of contacts to send 12v power to the blower. You can test one side of this relay circuit by inserting a small wire jumper across the relay terminal sockets 30 and 87. This sends 12v power (fused) immediately to power the blower. If this side of the relay circuit powers the blower, the command side of the relay can be tested with a multimeter but only when starting up with a cold engine. Relay terminal sockets 85 and 86 are the command side, energizing the relay solenoid. Only one of these two terminals is electronically switched by the pcm driver, 12v or ground. Measuring both terminals for voltage should result in zero volts before starting then show 12v with a cold engine startup for about a minute or so. You may have to examine wiring between blower, ground and power from the relay.

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