144 KENR9126
Troubleshooting Section
g02199433
Illustration 45
(P1-1) Neg ative battery
(P1-2) Neg ative battery
(P1-3) Neg ative battery
(P1-7) Unswitched positive battery
(P1-8) Unswitched positive battery
(P1-9) Neg ative battery
(P1-10) Negative battery for comm unications
adaptor
(P1-15) Uns witched positive battery
(P1-20) J1939 data link positive
(P1-21) J1939 data link negative
(P1-22) J1939 s hield
(P1-23) Da ta link positive
(P1-24) Data link negative
(P1-39) Alternator charging
(P1-40) K eyswitch
(P1-52) Remote shutdown switch
(P1-57) Starter interlock
Test Step 1. Inspect Electrical Connectors
and Wiring
A. Turn the remote shutdown switch to the OFF
position.
B. Remove the electrical power from the ECM.
C. Thoroughly inspect the ECM connectors J1/P1
and J2/P2. Inspect all of the connectors that are
associated with this circuit. Refer to the diagnostic
functional test Troubleshooting, “Electrical
Connectors - Inspect”.
D. Perform a 45 N (10 lb) pull test on each of the
wires in the ECM connector that are associated
with the circuit.
E. Check the ECM connector (allen head screw)
for the proper torque. Refer to the diagnostic
functional test Troubleshooting, “Electrical
Connectors - Inspect”.
F. Check the harness and the wiring for abrasion
and for pinch points.
Expected Result:
All connectors, pins, and sockets are completely
inserted and coupled. The harness and wiring are
free of corrosion, of abrasion, and of pinch points.
All connections and grounds are tight and free of
corrosion.
Results:
•
OK – The harness and wiring are OK. Proceed
to Test Step 2.
•
Not OK – There is a problem in the connectors
and/or wiring.
Repair: Repair the connectors or wiring and/or
replace the connectors or wiring. Ensure that all of
thesealsareproperlyinplaceandensurethatthe
connectors are completely coupled.
Verify that the repair eliminates the problem.
STOP.
Test Step 2. Check the Battery Voltage at
the ECM
A. Turn the remote shutdown switch to the ON
position.
B. Disconnect the J1/P1 ECM connector.
C. Restore the electrical power to the ECM.
D. Measure the voltage between P1-7 (Unswitched
Positive Battery) and P1-1 (Negative Battery).
E. Measure the voltage between P1-8 (Unswitched
Positive Battery) and P1-2 (Negative Battery).
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