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C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Jan 26, 2019 | 04:03 PM
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I previously had a thread regarding my scanner not connecting to my 91. Finally got it to read and got code 15. Would this mean an electrical issue or that the CTS is bad?

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Old Jan 26, 2019 | 05:18 PM
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Could be either issue. I think you can test the CTS by measuring the resistance at known temps, like boiling water.
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Old Jan 26, 2019 | 06:02 PM
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Originally Posted by JimLentz
Could be either issue. I think you can test the CTS by measuring the resistance at known temps, like boiling water.
In a previous thread glass slipperdid provide me a chart showing what resistance should be at difference temperatures. I'm hoping to have time and good enough weather for me to test the CTS further.
Last edited by CorvetteRules; Jan 26, 2019 at 06:04 PM.
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Old Jan 26, 2019 | 06:42 PM
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If this is a real scanner where it is capable of reading data and not a code reader, see what the ECM is THINKING that the temp is, hit the sensor with an IR Thermometer and compare.
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Old Jan 26, 2019 | 06:52 PM
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Originally Posted by aklim
If this is a real scanner where it is capable of reading data and not a code reader, see what the ECM is THINKING that the temp is, hit the sensor with an IR Thermometer and compare.
I believe it can with OBD2, but reading up on if it can with 1.

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Old Jan 27, 2019 | 01:02 PM
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If sensor is unplugged .Open code will set. Using a DVOM volts across cts connector would be approx 5.0v. Sometimes the insulation on the connector harness will blister and peel away. Exposed wires will contact each other setting this particular code.
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Old Jan 29, 2019 | 06:58 AM
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You need a scanner that will read OBD 1 engine data; don't think the Actron will read OBD 1 data.
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Old Jan 29, 2019 | 07:39 AM
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Not sure what Actron model that is but the 9690 will read and log OBD 1 data.
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Old Jan 29, 2019 | 08:54 AM
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Originally Posted by cdm747
Not sure what Actron model that is but the 9690 will read and log OBD 1 data.
I do have the 9690, but based on the code 15 showing voltage low or short of the CTS I tried unplugging the CTS https://www.corvetteforum.com/forums...i-resoved.html and found that did resolve the issue I was having. Now that I know the answer to that problem I can concentrate on the electrical wiring issue with the power seats and locks that is causing the accessory breaker to trip and get hot.
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