TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
CAT DATA LINK CIRCUIT TEST - CONTINUED
3.
Check for an open circuit.
a.
Fabricate a jumper wire. Use jumper wire to create a short circuit between terminals D (Data Link +) and terminal
E (Data Link -) on diagnostic connector.
b.
Measure resistance between P1-8 and P1-9.
c.
Measure resistance between terminals at connector for each control module that was connected to Data Link.
Expected Results. Each resistance check indicates an open circuit.
d.
e.
If resistance check indicates a short circuit:
(1)
If results are OK, perform this procedure:
(a) Connect J1/P1 connectors. Connect ET to diagnostic connector (WP 0005 00).
(b) Check CAT Data Link for proper operation. If CAT Data Link does not operate correctly, there may be
a problem with ECM.
(c) Replace original ECM (WP 0057 00). Verify problem is resolved.
(2)
If results are not OK, replace wiring harness in question (WP 0195 00 thru WP 0201 00). Ensure seals are
properly in place and connectors are securely connected. Verify repair eliminates problem.
4.
Perform "wiggle test" with ET.
a.
Select "Wiggle Test" from diagnostic tests on ET.
b.
Choose appropriate group of parameters to monitor.
c.
Press "Start" button. Wiggle wiring harness to reproduce intermittent problems.
d.
Audible beep will be heard if an intermittent problem exists and status will be highlighted.
Expected Results. No intermittent problems were indicated during "Wiggle Test".
e.
(1)
If results are OK, no intermittent problems were found. Harness and connectors appear to be OK. If you
were sent from another procedure, return to procedure and continue testing. If this test has resolved prob-
lem, return engine to service.
(2)
If results are not OK, replace wiring harness in question (WP 0195 00 thru WP 0201 00). Ensure seals are
properly in place and connectors are securely connected. Verify repair eliminates problem.
0013 00-16
