Question about 2006 Dodge Grand Caravan
I had the problem where the wires were damaged by road debris. The wires cross under the radiator, exposed, on the cross frame rail-driver's side. I put some shrink tubing over the wire, soldered them back together, slipped the shrink tubing over the repair and heated them up to seal nicely. Black tape over the repair. I thought i had a one in a million problem ;-).
Of course I bought a new sensor too...Doh. well I have a spare now.
Posted on Sep 17, 2010
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Posted on Jan 02, 2017
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Apr 05, 2014 | 2004 Dodge Grand Caravan
Feb 10, 2013 | 2010 Dodge Grand Caravan
If there are any other ECT sensor codes, diagnose them first.
Using a scan tool, check the ECT reading. On a cold engine, it should match the IAT reading or should be equal to ambient (outside) temperature reading. If it does match the IAT or ambient temp, check the freeze frame data on your scan tool (if equipped). The saved data should tell you what the ECT reading was when the fault occurred.
a) If the saved info indicates that the engine coolant reading was at the coldest exreme (around -30 deg. F) then that's a good indication the ECT resistance was intermittently high (unless you live in Anchorage!) Check for an open in the ECT sensor ground and signal circuits and repair as necessary. If they appear okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.
b) If the saved info indicates that the engine coolant reading was at the warmest exreme (around 250+ deg.F) then that's a good indication the ECT resistance was intermittently low. Check for a short to ground on the signal circuit and repair as necessary. If it appears okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.
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