Quote:
Originally Posted by RobertAvitia
And this brings up my other concern, my cars throwing a p1682 code. Looked it up and it for the ignition switch reading different voltages between 2 circuits or faulty ecm but the car runs like it has since I bought it off the lot.
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Ignition switch does not read voltages.
The ECM receives two switched voltages. If the comparison between the two is not within 3 volts, it throws p1682.
The switched voltages go through the ignition switch, so that is a possible source of the problem. One of them also goes through a powertrain relay, also a potential trouble source.
Battery and charging... I would say unlikely. This is an error code based on comparison of input voltages, not a "universal" low voltage.
There are 2 ignition 1 voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the ignition switch through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 will set.