80-JB566-1 Rev. G
25-3
MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
Performance Monitoring Troubleshooting
Normal Performance
Performance Monitoring Faults and Descriptions
Monitored Active Faults are controlled by the Customer Specified parameters sent to the unit.
The following chart shows the faults that may surface.
Active Fault Field Value Definitions
Display
Shows
Associated
Fault
Description/Symptom
Possible Cause
+
Fault no longer active
Cleared
-
Fault not monitored
Performance monitoring parameters specified
not to monitor.
0
No Power
(MCP50)
Power detected OFF
for more than the wake-
up time.
Main power was lost, causing the MCP to stay
asleep longer than its wake-up interval.
1
RPM Zero
(MCP50)
RPM zero when speed
is non-zero.
- RPM sensor or connection problem.
- J1708 selection parameter set wrong.
- In rare cases, no idle can be caused by faulty
axle sensor input (e.g., wires reversed)
causing a positive reading for speed while the
vehicle is stationary.
2
Bad Ignition
(MCP50)
Ignition OFF and speed
or RPM non-zero.
Problem with MCP50’s ignition line wiring or
fuse.
3
RPM Sensor
(MCP50)
Engine posted PID
(194) and PID (190).
RPM sensor or connection problem to the
engine, detected by the engine’s diagnostics.
4
Speed
Sensor
(MCP50)
Engine posted PID
(194) and PID (84).
Speed sensor or connection problem to
engine, detected by the engine’s diagnostics.
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