Air Pump System
NOTE:
A special tester is necessary to accurately measure the electronic control unit operation. The following tests can be made to determine if air injection system is working properly.
- Warm engine to normal operating temperature and allow to idle. Air should be escaping from filter near diverter valve. Remove purple/blue hose from air duct and plug end with finger. Air should be injected and not escape from diverter valve. Reconnect hose.
- Disconnect "Y" fitting from both thermal vacuum valves and check for vacuum at both sides of "Y". If not, clean hoses, "Y", orifice, and vacuum port.
- Check that both thermal valves are open and air passes through freely. If not, replace. If diverter valve is not operating correctly and all other connections are good, replace it.