Intermittent Fault Diagnostics; Displaying Diagnostic Gauge Software - Northern Lights OM-C3 Operator's Manual

Intermittent Fault Diagnostics

Intermittent faults are problems that periodically "go away".
A problem such as a terminal that intermittently doesn't
make contact can cause an intermittent fault. Other
intermittent faults may be set only under certain operating
conditions such as heavy load, extended idle etc. When
diagnosing intermittent faults, take special note of the
condition of wiring and connectors since a high percentage
of intermittent problems originate here. Check for loose,
dirty or disconnected connectors. Inspect the wiring
routing looking for possible shorts caused by contact with
external parts (for example, rubbing against sharp sheet
metal edges). Inspect the connector vicinity looking for
wires that have pulled out of connector terminals, damaged
connectors, poorly positioned terminals, and corroded or
damaged terminals. Look for broken wires, damaged
splices, and wire-to-wire shorts. Use good judgement if
component replacement is thought to be required.
NOTE: The Engine Control Unit (ECU) is the
component LEAST likely to fail.
Suggestions for diagnosing intermittent faults:

Displaying Diagnostic Gauge Software

NOTE: The following steps can be used to display
the software version of the diagnostic gauge
if needed by your dealer for troubleshooting.
This is a read only function.
1. Starting at the single or four engine parameter display,
press the "Menu" key.
2. The main menu will be displayed. Use the "Arrow" key
to scroll through the menu until "Utilities" is highlighted.
Troubleshooting
If the problem is intermittent, try to reproduce the operating
conditions that were present when the Diagnostic Trouble
Code (DTC) set.
If a faulty connection or wire is suspected to be the cause
of the intermittent problem: clear DTCs, then check the
connection or wire by wiggling it while watching the
diagnostic gauge to see if the fault resets.
Possible Causes of Intermittent Faults:
1. Faulty connection between sensor or actuator and
harness.
2. Faulty contact between terminals in connector.
3. Faulty terminal/wire connection.
Electromagnetic interference (EMI) from an improperly
installed 2-way radio, etc. can cause faulty signals to be
sent to the ECU.
NOTE: Refer to wiring diagram foldouts earlier in this
section as a guide to connections and wires.
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Menu Key
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Select Utilities
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