EFE Relay

AIV Solenoid
Energized engine temperature between 15° C (59° F) & 40° C (104° F) [1]
Energized engine temperature above 40° C (104° F) [2]

EGR Solenoid
Energized when starting
Energized low engine temperature
Energized when idling
Energized engine rpm over 4500
Energized engine rpm below 1000

Mixture Heater And Relay
Energized engine temperature below 70° C (158° F)
Energized engine temperature over 70° C (158° F) [3]

[1] Engine rpm below 2500.
[2] Idle switch closed and rpm below 1500 only.
[3] Only under heavy load for a few minutes.