J.P. Instruments EDM 900 Pilots Guide - Manual (Page 47)

For Your Safe Flight Page 47
Troubleshooting the EDM
Diagnostic Testing on Startup and During Flight
When your EDM is first turned on, it tests internal components,
calibration and integrity of the probes. Most alarms are disabled until the
engine has been started.
During flight, probes are constantly checked for inconsistent or
intermittent signals. A faulty channel or probe encountered during start-up
or during flight will be deleted from the sequence, producing a missing
column or blank digital data.
Diagnostic Messages
The following displays indicate malfunctions in the system:
Startup and Operational Diagnostics
0.0 GPH Zero’s indicate Fuel flow is too low to register
--- GPH Dashes indicate No fuel flow transducer signals
--- H.M Dashes indicate No fuel flow transducer signals
OPEN PRB
Open probe. Wiring to probe is open circuit. Check
wiring and crimps. Swap probes to troubleshoot.
BAD-PRB
Bad probe. Erratic reading. May be poor electrical
connection. Swap probes to troubleshoot.
Red ‘X’ drawn
through a gauge Gauge is non functional.
CAL ERR Calibration error. Return unit to factory.
DSP XXX Internal communication error. Return unit to factory.
COMM ERR Internal communication error. Return unit to factory.
NO I 5 MV Calibration error. Return unit to factory.
NO 50MV Calibration error. Return unit to factory.
NO 2.5V Calibration error. Return unit to factory.
PWR DWN Power down the instrument and power up again.
WARNCAL,
WARNCFG Transient warning messages. If they persistently
occur, return the unit to JPI for repair.