Air Injection Vacuum Control Solenoid Valve

Air Flow Meter Self-cleaning Operation
Key off wire heated to 1000° C (1832° F) for 1 second [7]

Air Regulator
When starting energized [4]
After started energized for 30 seconds [4]

AIV Solenoid
Energized engine temperature low [1]

EGR Solenoid
Energized during starting
Energized idle switch closed
Energized low manifold vacuum
Energized low engine temperature
Energized high engine temperature
Energized engine rpm over 2,700

Fuel Pump Relay
When starting energized [4]
After started energized for 30 seconds [4]

Fuel Pump Voltage Control
5 seconds after ignition switch is turned on 0.1 - 0.3 vdc
When starting 0.1 - 0.3 vdc
Engine temperature below 10° C (50° F) 0.1 - 0.3 vdc
30 seconds after started 0.1 - 0.3 vdc [5]
After started 0.1 - 0.3 vdc [6]

O2 Sensor Heater (Turbo only)
Energized engine rpm under 2800 rpm
Energized except under heavy load

Pressure Regulator Solenoid
Energized fuel temperature between 40 & 78° C (104 & 172° F) [2]
Energized fuel temperature above 78° C (172° F) [3]


[1] During idle or deceleration only.
[2] For approx. 30 seconds after starting.
[3] For approx. 3 minutes after starting.
[4] Engine temperature above 100° C (212° F).
[5] Engine temperature above 50° C (122° F).
[6] Engine temperature above 90° C (194° F) and idle switch open.
[7] After 5 seconds EXCEPT as follows:
Engine speed has not exceeded 1500 rpm.
Vehicle speed has not exceeded 12 mph (20 km/h).
Cylinder head temperature over 115° C (239° F.
Engine stall with key on.