here is what i found on p1416.
P1416 Chevrolet
P1416 Chevrolet - Secondary Air Injection System Bank 2
Possible causes
- Faulty Secondary Air Injection (AIR) pump
- Secondary Air Injection check valve bank 2
- Secondary Air Injection (AIR) pump electrical circuit fault
- Blocked Secondary Air Injection (AIR) system
When is the code detected?
The P1416 code is set when no O2 sensor voltage change is detected by the Engine Control Module (ECM).
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1416 Chevrolet Description
An Secondary Air Injection (AIR) pump is used on this vehicle to lower tail pipe emissions on start-up. The
PCM supplies a ground to the AIR pump relay, which energizes the AIR pump.
The Powertrain Control Module (
PCM) monitors the HO2S voltages to diagnose the AIR system.
During the AIR test the
PCM activates the AIR pump during closed loop operation. When the AIR is activated, the
PCM monitors the HO2S voltages and short term fuel trim values for both banks of the engine. If the AIR system is operating properly, the HO2S voltages should go low and the short term fuel trim should go high.
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