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Omnitracs Knowledge Base

Mobile-Generated Fault Conditions

Mobile-Generated Fault Conditions

These are faults that the mobile can detect and report with an extraction.

Fault Description Condition
No Power Power detected off for more than the wake-up time Main power was lost, causing the mobile unit to stay asleep longer than its wake-up interval
RPM Zero RPM zero when speed is non-zero
  • RPM sensor or connection problem
  • J1708 selection parameter set incorrectly
  • 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.
Bad Ignition Ignition off and speed or RPM non-zero Problem with mobile unit's ignition line wiring or fuse
RPM Sensor Engine posted PID (194) and PID (190) RPM sensor or connection problem to the engine, detected by the engine's diagnostics
Speed Sensor Engine posted PID (194) and PID (84) Speed sensor or connection problem to the engine, detected by the engine's diagnostics
Bad Speed More than 2 hour IGN = On with Spd = 0, RPM greater 1300
  • Speed sensor or connection problem - mobile unit
  • Speed sensor or connection problem - engine
  • Engine speed sensor parameter not enabled
0 Spd and RPM More than 2 hrs with IGN = ON with Spd = 0, RPM = 0
  • Disconnect the entire accessory cable
  • RPM sensor or connection problem
  • J1708 selection parameter set incorrectly
  • Data link connection problem
  • Driver using ignition position for accessory operation
  • Mobile unit ignition line wired to accessory position
Enghrs Msmtch Engine operation while mobile unit off; 12 minutes engine time or 1 mile/km distance accumulated, or 1 gallon/liter fuel used
  • Engine run with main power disconnected
  • Engine run with data link disconnected
  • Engine run with ignition line disconnected
LTD Mismatch LTD mismatch with stored mobile unit data
  • Engine run with main power disconnected
  • Engine run with data link disconnected
  • Engine run with ignition line disconnected
Steady Speed Speed signal constant for more than 5 minutes A pulse generator may have been connected, either to the mobile unit or to the engine.
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