Re: 1227165 CTS trouble

["Bruce Plecan" <nacelp@bright.net>]

Disconnecting the sensor should show a low temp..
For any one using a 165, carry a known good one in their diagnostic tool
kit.   They are subject to failure, at a higher rate then most ecms
Grumpy



> Hi. I'm looking for some technical advice. I've searched the archives
> (my downloaded copy) and have found no answers.
> Working on a 1987 350 TPI 1227165 (BUA, from a GTA) recently
> transplanted into another car. Finally got a scan tool last week and now
> I know why one of the cooling fans runs soon after startup: CTS goes
> from 113 degrees F, slowly to 120, then jumps to 240 withing a few
> minutes of start-up. There are NO trouble codes set.
> Replaced the CT sensor (re-tested new sensor and it changes resistance
> correctly as did the old one) and the wiring tests ok. I went to board
> level using Ludis' schematics and the circuit checks out to the IC's.
> Everything else scans within acceptable parameters.
> GM flowcharts only test for DTC 14, HI temp or DTC 15, LOW temp. When I
> pull the CTS connector, I still scan 244 degrees F. Voltage on pin C10,
> CKT410, is 3.98 VDC, GM wants 5 VDC. Is this a "faulty ECM?" Is there
> something else to check?
>  Thanks --JB
>
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