Trouble code 15 CTS signal high voltage

Tiny
THESANDMAN
  • MEMBER
Okay, there is confusion on my part. There are two male plugins to the ECM. C and D are on one plugin to the ECM (that has only alphabet marked slots on it) and 10 and 12 are on the other ECM plugin (that has only numberical marked slots). D is an empty slot with no wire feeding into it, I do find the yellow and black or dark brown on the numbered plugin in the numbered slots #3 (solid yellow) and slot #7 (solid black or dark brown). Each show no (0.00 ohms reading) resistance to the corresponding temp sensor plugin's terminals. No slot on the alphabetised plugin has a corresponding solid yellow wire, and while there are black and dark brown wires, no slot wires seem to be connected directly to temp sensor.
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Sunday, October 2nd, 2011 AT 7:09 PM
Tiny
SATURNTECH9
  • MEMBER
If you got good ohms reading from the coolant temp sensor to the ecm like you did then you found the correct wires. The service info isnt always dead on accurate there are errors printed. So go down to the next step on the right side of the trouble tree after testing those wires and check the terminal tighteness to the ecm connectors etc.I would also check termial tightness at the coolant temp sensor.
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Sunday, October 2nd, 2011 AT 8:25 PM
Tiny
THESANDMAN
  • MEMBER
Would it help to add contact gel to the terminal connections?
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Sunday, October 2nd, 2011 AT 9:21 PM
Tiny
SATURNTECH9
  • MEMBER
You can that is only to keep the terminals from getting corroded though.
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Sunday, October 2nd, 2011 AT 9:28 PM
Tiny
THESANDMAN
  • MEMBER
Another question then. If I turn the ignition on and I check the voltage between ECM slots 3 and 7. What voltage should I be expecting to read? It appears that it should be 4 volts (as the trouble tree is based on either over or under 4 volts). The next step on the trouble tree is to check the ohms for each wire (which had 0.00 ohms resistance) which if I read it correctly from the trouble tree is normal (or open)? That only leaves the problem with the ECM connector. So if I check the voltage at the ECM will I risk doing damage to the ECM? And if I can then I have eliminated the ECM as the problem, the wires themselves, the plug, and I previously tested the sensor (and it ohms tested in accordance to the temp to resistance values chart). This leaves only the connection at the wiring harnesses to the ECM? Or am I misreading something?
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Monday, October 3rd, 2011 AT 10:18 PM
Tiny
SATURNTECH9
  • MEMBER
At the ecm across those two terminals you should read the same voltage as expected at the coolant temp sensor. When your ohms meter leads are not hooked to anything what does it read OL?If so sounds like you have a good ohms reading on the wires. Also you check the voltage at the ecm with the key in the run position.
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Monday, October 3rd, 2011 AT 10:28 PM

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