TM 5-3805-290-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
STARTING AID OUTPUT CIRCUIT TEST - CONTINUED
g.
Expected Results. When jumper wire is connected, relay is CLOSED. When jumper wire is disconnected, relay is
OPEN.
(1)
If result is OK, proceed to step 6.
(2)
If result is NOT OK, problem exists in wiring harness between MIC and ECM connector. Replace wiring
harness in question (WP 0169 00 thru WP 0175 00). Verify problem has been eliminated. If repair has not
eliminated problem, proceed to step 6.
6.
Override starting aid to test ECM.
a.
Turn engine start switch to OFF position (TM 5-3805-290-10).
b.
Remove 70-pin breakout T.
c.
Connect P1 ECM connector (WP 0053 00).
d.
Connect MSD to diagnostic connector (WP 0006 00).
e.
Turn engine start switch to ON position (TM 5-3805-290-10).
f.
Use MSD to monitor status screen.
g.
Use starting aid override parameter to override ether start system.
h.
Verify starting aid is either ENABLED or DISABLED.
i.
Verify lamp for starting aid is on.
j.
Starting aid is working properly.
k.
Expected Results.
(1)
If result is OK, ECM is operating properly.
(2)
If result is NOT OK, ECM is not working properly.
(a) Remove all jumpers and replace all connectors.
(b) Replace engine ECM (WP 0053 00). Verify repair eliminates problem.
WIRING HARNESS (OPEN CIRCUIT) TEST
0013 00
N OT E
Open circuit results in no flow of electrical current. Open circuit is usually caused by failed electrical wires or
poor connection of electrical connectors. If electrical wire or connection is broken, flow of electrical current
through circuit is interrupted. Normally, closed circuit will have less than 5 Ohms of resistance.
1.
Identify connectors and wire numbers of suspect circuits. Use Schematics to identify circuits (WP 0210 00).
2.
Turn engine start switch and disconnect switch to OFF position (TM 5-3805-290-10).
3.
Disconnect component and ECM from wiring harness. Refer to appropriate work package.
4.
At one disconnected harness connection, place jumper wire from contact of suspect wire to frame ground.
5.
At other connector of wiring harness, use multimeter probes to measure resistance from contact of suspect wire to frame
ground.
6.
Expected Results. Resistance is less than 5 Ohms.
a.
If results are OK, circuit is correct.
b.
If results are NOT OK, there is an open circuit in wiring harness. Replace wiring harness in question (WP 0169 00
thru WP 0175 00).