Northstar Engines and System Technical Discussion Discussion, Temperature Gauge Dampening in Cadillac Engine Discussion; Courtesy Of 97EldoCoupe I've been going through some old service manuals I have. This; due to my '97 STS having ...
- 07-28-10 11:23 PM #1
Temperature Gauge Dampening
Courtesy Of 97EldoCoupe
I've been going through some old service manuals I have. This; due to my '97 STS having an over voltage condition that blew out the PCM....
Section 8C1-8 of the 1996 Service Manual Book 1.COOLANT TEMPERATURE
Coolant temperature is broadcast from the PCM via Class 2 serial data to the IPC. The IPC compares the temperature data with a sixteen-point calibration table to determine needle deflection. A smoothing filter is used to secure a continuous response.
This is out of the 1996 manual; but keep in mind Cadillac retained a lot of the same electronic engineering through many years and models.
I don't know if this has ever been found by another forum member or not; but if possible; Ranger; please Sticky this somewhere for future reference. This has been of topic for a while; and short of talking to the original engineers; this may be the most in-depth information on the subject we will ever come up with.
Also the smoothing filter; since we now know one is used; may be programmed different through the years and models. Doubtful but easily possible.