11-2
GENSET STARTS OR STOPS WITHOUT COMMAND – NO FAULT CODE
WARNING
Some genset service procedures present hazards that can result in severe personal injury
or death. Only trained and experienced persons with knowledge of fuels, electricity, and machinery
hazards should perform genset service. See Safety Precautions.
Logic: To start or stop – control receives ground at start or stop input on control, DC voltage drops below 9V
and controller de–energizes (shuts down in sleep mode)
Possible Cause: Low battery voltage, shorted harness connection, faulty start/stop switch, Auto Gen Start
(AGS) is enabled
Diagnosis and Repair:
1. Check last fault and record.
2. Measure battery voltage at battery and genset.
3. Inspect battery connections and cables for cleanliness, tightness and damage: clean, tighten and repair
connections and cables as necessary.
4. Check electrolyte level and hydrometer reading in maintenance type batteries: replace electrolyte and
recharge or replace battery as necessary.
5. Disconnect genset control P1 connector, verify P1 pins are fully inserted and inspect pin condition per
PSB–676: insert, repair or replace pins as necessary.
6. Reconnect P1 connector and test run genset for symptom: repair or replace pins in connector as neces-
sary.
7. Measure battery voltage at genset while attempting to start from local or remote switch: recharge or re-
place battery if voltage drops below 9 VDC, test and service genset battery charger if so equipped, in-
crease battery cable size or run parallel cables.
8. Measure battery voltage and check for charger increase while genset is running.
9. Measure for continuity change across start/stop switch between neutral and start position and neutral and
stop position at switches and at connector P1: reconnect or repair connections, replace switches as nec-
essary.
10. Measure for continuity from start and stop inputs to ground at switches and at connector P1: Repair or
replace damaged harness.
11. Determine if AGS is installed and enabled (AGS will command start and stop based on its own settings):
disable AGS or explain AGS function to customer (see PSB-666).
To Next Page
Loading...
Need help?
General
