Engine coolant temp sensor has power but other wire has none(reports nothing?)
I checked the codes on my car yesterday and it was saying my ECT was out of range , keys on engine off.
I checked the light green/yellow wire and it was getting power and I checked the black/white wire and it wasnt reporting any voltage (car off or on warmed up). Is that a sign of a bad temperature sensor ?
Another odd thing is, it reported those codes and now it wont report them any more , on or off??
EEC also has a wiggle-test mode. Activate KOEO for 10 seconds, and then
deactivate and activate again using your scanner, or by unhooking the
jumper wire - if that's what you're using. You can now wiggle engine
harness wires and watch the scanner or your check engine light for any
signals. ( Charles O. Probst )
You can also do this with the engine running - using KOER mode. You
might have had a loose connection which was "fixed" when you moved
the wire(s) to check the circuit.
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1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads!
Sounds like a worn out connector. You already replaced your ECT per your other post.
To check the ECT, get a pan of cold water on the stove, with an ohm meter connected to the ECT place it in the water, wait for the water to warm up. You should see the resistants drop as the water warms up. If it does, then start looking at the connector. You can buy this connector at your local dealer. It will have a length of wire already attached, just solder in.
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Tony Berger
91 LX 337 Incon Twin Turbo
D&D Viper T-56 6 speed
Maximum Motorsports front to rear
94 Cobra
99 Lightning
and it's JUST-N-LX
Engine coolant temp sensor has power but other wire has none(reports nothing?) 
Charles O. Probst )
