I'm looking for a schematic drawing for a 40 pin cat ecm. My engine fan is not turning on automatically anymore. Had it hooked up to a prolink and it shows the ecm is sending the signal for the fan to come on but is not doing it. The fan still turns on manually just fine though. Also on this truck the gauge has always shown about 20 degrees less than it actually is. We have replaced the gauge and the sensor for it twice before trying to correct the problem to no avail. Any idea's? The ecm is reading accurate tempature and sending the signal for the fan at correct temp according to the pro link.
40 pin wiring schematics
Discussion in 'Trucks [ Eighteen Wheelers ]' started by RHay, May 10, 2013.
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