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VVEL Question on Intake Manifold Pressure

Originally Posted by SonicVQ ... I guess the MAP PID is being modified by the OBD-2 output to a "expected" value and not actual. If I am 20% throttle, constant

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Old 01-08-2016, 08:20 PM   #1 (permalink)
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Originally Posted by SonicVQ View Post
... I guess the MAP PID is being modified by the OBD-2 output to a "expected" value and not actual. If I am 20% throttle, constant speed, there should be none to little intake manifold vacuum - but the MAP PID shows ~15" vacuum.
The TPS value is faked but I don't recall MAP being fudged. FSM should have details.
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Old 03-05-2016, 08:56 PM   #2 (permalink)
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Update:
After monitoring the intake manifold vacuum and throttle position, the TB does close when you lift off the accelerator. It opens when the throttle position is greater than about 13%. This keeps enough vacuum for the brake booster and for the mode $06 evap tests.


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Last edited by SonicVQ; 03-05-2016 at 08:59 PM.
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