Where is the "starter" located on a 2002 Dodge Caravan 3.3L engine?

1 ANSWERS

1. amomipais82
   

   Hi There,
   This code reads ECT SENSOR CIRCUIT LOW, which means the PCM (engine controller) is seeing something very close to 0v at the signal wire. If it still sets it with the sensor and PCM replaced, we need to check the signal circuit to see what's going on.
   
   When disconnected at the coolant sensor, a good circuit should set a P0116 (high voltage) code. If it doesn't, there's almost certainly a harness short to ground somewhere, as a broken wire (open circuit) would set the P0116 over the 0117 code on its own.
   
   Test the disconnected ECT circuit for voltage first, then check it for continuity to ground. It SHOULD show an open circuit, but I believe you've got a harness short that's grounding the signal voltage, which is why you're getting this code.
   
   Here's the wiring diagram for ECT and a couple other sensors in the area. Note that the sensor ground circuit is shared and with no complaints from other sensors, chances are very good that the problem is localized to the ECT signal circuit itself.
   
   
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   Remember that an open circuit anywhere in this diagram means a P0116, so you'll be testing and looking for a grounding condition between the sensor and the PCM in the violet/ orange signal wire. With no intermediate connectors shown on the ECT wiring, you'll probably be looking at a wiring routing that crosses the front of the engine, down near the starter and runs up along the passenger (front) side of the engine.
   
   If a short to ground is found, connect your meter to the signal circuit and begin wiggling while watching the meter. Small changes will show up easily using this method, which can help to guide you to the actual shorting area.

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