Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** the air pump work?
It sounds like passages in exhaust may be clogged. Scan test the air injection pressure sensor to be atmospheric pressure of approximately 14-15 PSI or 2.7 volts. Run the air pump and expect the voltage to go up to approximately 3.4 V. If the voltage does not increase, check for an air leak between the pump and the valve. Run the air pump and open the air valve and expect the voltage to drop to approximately 3 volts. If the voltage does not drop, remove the valve and repeat the test and check for air flow out the valve and voltage to drop. If the voltage now drops, check the exhaust for a restriction. Let me know if you have more questions or if there is anything else I can do to help. Thanks.
The related fuses would be under the rear seat so I would double check fuses again if good then try to disconnect battery for 10 minutes. Let me know how it goes, thanks.
Either one works. Let me know how it goes, thanks.
Then next step would be checking codes in body control module if you are sure none of the fuses are blown. Let me know if you have more questions, thanks.