Watchdog Alarm - Troubleshoot
A 602 alarm is a watchdog alarm. A watchdog alarm can be generated during engine cranking. In order to prevent this alarm, a separate constant 24 VDC supply to the regulator should be provided. If a constant 24 VDC supply is not available, then remove all battery power to the regulator during engine cranking in order to prevent the 602 alarm.
Caterpillar Information System:
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2005/12/01 New Injection Actuation Pressure (IAP) Sensor Available {1925}
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