TM 9-6115-729-24
0013
ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
SYMPTOM
2.
Electrical Connectors Wiggle Test.
System Operation Description:
Most electrical problems are caused by poor connections. The following procedure will assist help detect
problems with connectors and with wiring. If a problem is found correct the condition and verify that the problem
is resolved.
Intermittent electrical problems are sometimes resolved by disconnecting and reconnecting connectors. It is very
important to 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.
NOTE
Perform the following test only after completing the tests in WP 0090.
MALFUNCTION
Electrical voltage or signal intermittent/erratic.
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Connect the Cat ET to connector CDC-P7 (WP 0012).
STEP 3.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
On EMCP set ENGINE CONTROL switch to COOL DOWN/STOP.
STEP 4.
Perform the Wiggle Test on the Cat ET.
a. Select the Wiggle Test from the Diagnostic Tests on Cat ET.
b. Choose the appropriate group of parameters to monitor.
c.
Press the Start button for the Wiggle Test. Wiggle the wiring harness in
order to reproduce intermittent problems. If an intermittent problem exists,
the status will be highlighted and an audible beep will be heard.
d. On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
(1) If no intermittent problems were indicated during the Wiggle Test, the
harness and connectors appear to be OK. If you were sent from another
procedure, return to the procedure and continue testing. If this test has
resolved the problem, return the engine to service.
(2) If at least one intermittent problem was indicated, repair the harness or
the connector (WP 0090).
(3) Verify that the repair eliminates the problem.
0013-11
