GENERATOR GP 3740469 - Caterpillar

Which Generate This Code:The Electronic Control Module (ECM) detects all of the following conditions:
Either the duty cycle is greater than 95 percent or less than 5 percent for one second, or the sensor frequency is greater than 1000 Hz or less than 150 Hz for two seconds.
There are no active diagnostic codes for the digital sensor supply (8 Volt DC).
The ECM has been powered for at least three seconds.System Response:The ECM will log the diagnostic code. The auxiliary temperature will be set to a default value.
NoneTest Step 1. Perform the following diagnostic procedure: Auxiliary Temperature Sensor Circuit - TestResults:
OK - STOP