1227165 CTS trouble

[Len Sabatine]

   Some possible kinks ; AC ckt , Fan Relay[s] or cranky '165 ECM.
   Double check all ground connections, twice.
   Len.

>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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