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Old 28-05-2007, 07:06 PM   #45
Cosmo Dude
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Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
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Quote:
Originally Posted by Dogo View Post
The ECU probably does some minor adjustment with the reading it gets from the oxygen sensor, but for acceleration it relies mostly on the air intake sensor.
Closed loop: ECU monitors exhaust gasses and alters injector pulses to meet the engines needs.
Open loop: ECU uses best guess and ignores input from the exhaust gas oxygen sensor.

Closed loop only works when the exhaust is up to temp but switches to open loop with WOT (wide open throttle) conditions.
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