Principle of operation, secondary airinjection
| Principle of operation, secondary air injection |
| Secondary air injection pump |
Roughly between one second (hot engine) and five seconds (cold engine) after the engine has started, the control module grounds pin 23 and causes the secondary air injection pump relay to operate and supply the pump and solenoid valve with current.
The length of time during which the control module grounds pin 23 (air injection pump and valve activated) is temperature-dependent, so that the maximum connection time is 100 seconds for a cold engine (below 20°C) and 15 seconds for a hot engine (above 70°C).
No connection of the secondary air injection system occurs at engine temperatures above 78°C (162°F).
This project is supported by memberships and donations. If you use this site, please consider Joining SCNA and/or making a donation.
Our Friends
