O2 heater control circuity: constant 12v or pulsed?
12-10-2003, 12:03 PM
#1
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O2 heater control circuity: constant 12v or pulsed?
On a stock ECU, does it supply a constant 12v to the heater section ALL the time, or is it a PWM signal?
What about the AEM EMS?
What about the AEM EMS?
12-10-2003, 01:00 PM
#2
Re: O2 heater control circuity: constant 12v or pulsed? (EE_Chris)
The hot lead (+12v) comes from the main relay - NOT from the ECU. The ground leg of the heater circuit goes to the ECU. The ECU closes that leg to ground when it wants to run the heater. I don't really know if the ECU turns off the heater after it warms up...
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