VVTi Control with AEM EMS-4 Question(s) - Toyota Yaris Forums

Bluevitz-rs · 12-31-2014, 11:15 PM

It might be advantageous to monitor a stock OCV for Hz (duty cycle) in normal operation to get a starting point on what values to set.

CT, you mentioned the ECM controls both ground and 12V wires. Does the valve work in two directions. Positive polarity for advance and negative for retard, or something to that effect?

CTScott · 01-01-2015, 01:13 AM

Quote:

Originally Posted by Bluevitz-rs

It might be advantageous to monitor a stock OCV for Hz (duty cycle) in normal operation to get a starting point on what values to set.

CT, you mentioned the ECM controls both ground and 12V wires. Does the valve work in two directions. Positive polarity for advance and negative for retard, or something to that effect?

No. It actually does it all via pulsing the positive terminal. It is constantly being adjusted though, so less or more flow through it allows retarding or advancing the timing.

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12-31-2014, 11:15 PM	#1
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	It might be advantageous to monitor a stock OCV for Hz (duty cycle) in normal operation to get a starting point on what values to set. CT, you mentioned the ECM controls both ground and 12V wires. Does the valve work in two directions. Positive polarity for advance and negative for retard, or something to that effect?