Troubleshooting (Diagnostics) - MQ Power WHISPERWATT DCA10SPX4 Operation Manual

ENGINE MALFUNCTION
DIAGNOSTIC LAMP CODES
When an engine malfunction is detected, the engine will
shut down and a fault code will be indicated as a flashing
pattern on the Preheat lamp.
Figure 57. Preheat Lamp
Symptom
Engine Over Speed
Low Oil Pressure
Low Battery Voltage
High Water Temperature
Rotation Sensor Fault
Solenoid Fault
Water Temperature
Sensor Fault
Charging Generator
Terminal Fault
Over Voltage
DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 41

TROUBLESHOOTING (DIAGNOSTICS)

Table 12. Engine Fault Lamp Codes
Condition
≥ 115% of rated engine speed
Oil pressure switch ON,
Engine shutdown at 7.1 psi (49 kPa)
Insufficient charge
Overheat,
Engine shutdown at
239°F (115°C)
Defective sensor, disconnection,
or short circuit
Disconnection or short circuit
Disconnection
Short circuit
Disconnection
VCC ≥ 18 V
The engine fault code flashing patterns consist of a
combination of one or more long flashes and one or more
short flashes. Refer to Table 12 for a list of fault code
flashing patterns and the associated countermeasures.
Flashing Pattern
1 Long 1 Short
1 Long 2 Short
1 Long 3 Short
1 Long 4 Short
2 Long 1 Short
2 Long 2 Short
2 Long 4 Short
2 Long 5 Short
2 Long 6 Short
2 Long 7 Short
Solution
Adjust engine speed.
Check engine oil level
and switch.
Inspect or replace engine
alternator/voltage regulator.
Make sure routine service
has been performed, and
check the thermo switch.
If the problem persists,
contact the Service
Department for repairs.
Check wiring,
replace sensor.
Check wiring,
replace fuel solenoid.
Check wiring or
replace sensor.
Check wiring. Check or
replace battery and engine
alternator.
Check or replace voltage
regulator and battery.