Integra L4-1590cc 1.6L DOHC FI (1987)
Air Injection: Description and Operation
Fig. 1 Air Injection System Schematic
This system, Fig. 1, is designed to improve emissions performance by supplying fresh air from the air cleaner into the exhaust manifold, through the
air suction valve.
When the air suction control solenoid valve is activated by the ECU, manifold vacuum raises the air suction valve diaphragm, allowing fresh air from
the air cleaner to be routed to the exhaust manifold. Activation of the solenoid valve is delayed, depending on coolant temperature, anywhere from 10-60
seconds after the engine is started.
Testing
AIR SUCTION VALVE
1.
Check all applicable vacuum hoses for cracks, blockage or improper connection. Repair or replace hoses as necessary.
2.
Start engine and allow to reach normal operating temperature (cooling fan cycling).
3.
Stop, then restart engine. Within 20 seconds of restart, check for suction noise from air suction valve with engine idling.
4.
If suction noise is not evident, disconnect vacuum hose from top of valve and check for vacuum within 20 seconds of restart using suitable vacuum
gauge. Vacuum should be present. If vacuum is not present, refer to steps 1 through 5 of ``Solenoid Valve'' testing procedure. If vacuum is present,
replace air suction valve and retest.
5.
Stop, then restart engine and check for suction noise from suction valve 30 seconds after restart. No suction noise should be evident. If suction
noise is evident, refer to steps 6 through 9 of ``Solenoid Valve'' testing procedure.
