Battery Voltage Too Low
electrical
Description
Battery voltage too low means main microprocessor voltage is less than 10 VDC except when starting, and the unit shuts down and alarms.
Activation Conditions
Battery voltage at the main microprocessor is less than 10 VDC (except when the engine starter is engaged).
Unit Behavior
Shutdown and alarm. Alarm condition only if activated while starting unit.
Reset Conditions
Auto reset after 15 minutes when the voltage at the main microprocessor is between 11 - 14 VDC, or alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check For 00051 Alternator not Charging 2. Check Battery Voltage a. Inspect battery cable ends and posts. Must be clean and tight. b. Test voltage at battery with unit off. Must be above 11 VDC. c. Test voltage at battery with unit running. Must be above reading with unit off. NOTE Voltage with unit running should always be higher than voltage with unit off due to battery charging. d. Perform load test on battery. Follow battery manufacturer’s procedure. 3. Check Connections to Main Microprocessor a. Check connections at PCM-T1, T2 and T3. Verify that connections are not damaged or corroded. b. Check voltage reading at 3MM-23 and 3MM-34. Must be above 11 VDC. c. Check Unit Data voltage reading. Must be within 0.5 VDC of reading obtained at 3MM-23 and 3MM- 34.