Intermittent electrical faults are sometimes resolved
by disconnecting and reconnecting connectors.
Check for diagnostic codes immediately before
disconnecting a connector. Also check for diagnostic
codes after reconnecting the connector. If the status
of a diagnostic code is changed due to disconnecting
and reconnecting a connector, there are several
possible reasons. The likely reasons are loose
terminals, improperly crimped terminals, moisture,
corrosion, and inadequate mating of a connection.
Follow these guidelines:
• Always use a 2900A033 Crimp Tool to service
Deutsch HD and DT connectors. Never solder the
terminals onto the wires.
• Always use a 28170079 Removal Tool to remove
wedges from DT connectors. Never use a
screwdriver to pry a wedge from a connector.
• Always use a 2900A033 Crimp Tool to service
AMP seal connectors.
• Refer to Troubleshooting, “ECM Harness
Connector Terminals” to service the connectors for
the Electronic Control Module (ECM).
• Always use a breakout harness for a voltmeter
probe or a test light. Never break the insulation of
a wire to access a circuit for measurements.
• If a wire is cut, always install a new terminal for the
repair.
The connection of any electrical equipment and
the disconnection of any electrical equipment
may cause an explosion hazard which may result
in injury or death. Do not connect any electrical
equipment or disconnect any electrical equip-
ment in an explosive atmosphere.
Illustration 186 g01131276
Diagram for the installation of a connector plug
(typical example)
(1) ECM connector
(2) Correctly inserted plug
(3) Incorrectly inserted plug
Illustration 187 g01131019
Seal for a three-pin connector (typical example)
512 UENR4469-36
Service
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