Rodeo (2WD) L4-2559cc 2.6L SOHC (4ZE1) (1991)
Air Regulator: Testing and Inspection
Air Regulator Testing
AIR REGULATOR TESTING
NOTE: Begin test with cold engine.
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Start cold engine and check that idle speed is slightly higher than specification.
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Idle speed should normalize at 850 - 950 rpm as engine temperature increases.
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After engine has warmed up, turn it "OFF" and disconnect hose between air regulator and throttle body at throttle body side. Plug hole in
throttle body.
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Start engine and alternately open and plug off hose going to air regulator. Engine speed variation between an open and closed hose should be
less than 50 rpm.
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Engine speed variation greater than 50 rpm indicates a defective air regulator that should be replaced.
TESTING FOR NO FAST IDLE
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Inspect hoses and connections; replace any defective hoses and ensure tight connections.
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Disconnect air regulator harness connector and check resistance across terminals. If it deviates from the specified 45 - 50 ohms, replace the air
regulator.
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With ignition switch "ON," check for voltage at harness connector. If there is no voltage, inspect wiring and fuel pump relay. Repair wiring
and/or replace fuel pump relay as necessary.
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If there is voltage present at the harness connector and no other problems have been detected, replace air regulator.