Quote:
Originally Posted by SouthArk370Z
Please get some help before you kill some electrical component(s) or start a fire.
But, yes, a decent multimeter and tools to access the wiring/sensors should be all you need. I'm guessing that the problem will be pretty obvious with a visual inspection.
I haven't looked at the wiring diagrams but the 5V reference that Jhill refers to may be internal to the ECM. If so, you will need to check it at the ECM (if possible). If the outputs from the sensors are out of spec (I'm betting that will be the case), the reference is probably not the problem. The 5V ref is just a possibility. I think (and it seems that JHill agrees) that the wiring/sensors is the most likely culprit.
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You're pretty safe to check it as the ECM typically have their own resistor in series before the output and that is how they determine a dead short or open as the sensors operating is typically .7-4.5 so if it sees 0 or 5 it know there is an open or short. On sensors that have a sig return it's a little different and if you screw the ref up well like the saying goes garbage in garbage out. Before you even venture in this journey I would highly recommend you pull those codes and get the wiring diagrams that go with those systems. Without proper documentation you are just guessing.