TSE DPT60, Owner'S Manual

Page: 150 / 459

Troubleshooting
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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 originates
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 splices
and terminals. Look for broken wires, damaged splices,
and wire-to-wire shorts. Use good judgment 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:
•
If diagnostic charts on preceding pages indicate that 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:
•
Faulty connection between sensor or actuator harness.
•
Faulty contact between terminals in connector.
•
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 diagrams later in this section
as a guide to connections and wiring.
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