THOMSON MEC 2 - V1.4 - Page 89

MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
84
SYMPTOM CORRECTIVE ACTION
(Note: engine sensors must be factory
supplied units only.)
- Verify that the battery supply DC negative
conductor is properly grounded to the
engine block (i.e. to a common ground
point).
Engine temperature or oil pressure displays 9999 - Check the wiring from the MEC 2 terminal
#37 & #38 to the engine mounted sender
are correct (i.e. wiring is not open or
shorted).
- Verify the engine mounted senders have
correct resistance reading for
corresponding input temperature or
pressure (refer to the Analog Temperature
and Pressure Calibration table for values).
- Verify calibration.
Engine alarms on high engine temperature or low oil
pressure when engine is operating within normal
limits
- Check the wiring from the MEC 2 terminals
#37 & #38 to the engine mounted senders
is correct (i.e. wiring is not open or shorted).
- Verify the engine mounted senders have
correct resistance reading for
corresponding input temperature or
pressure (refer to the Analog Temperature
and Pressure Calibration table for values).
Key presses on the lexan faceplate do not operate - Verify the interconnecting ribbon cable
between the lexan faceplate and main
printed circuit board is correctly connected.