Troubleshooting

RENR2696-01 125
Troubleshooting Section
Batteries give off flammable fumes which can e x-
plode.
To avoid injury or death, do not strike a match,
cause a spark, or smoke in the vicinity of a battery.
NOTICE
Do Not connect t
he Bypass Harness to the battery
until the 20 Amp in-line fuse has been removed from
the +Battery line. If the fuse is not removed before
connection to
the battery a spark may result.
A. Turn the keyswitch to the ON position.
B. Disconnect engine harness connector J1/P1 from
the ECM.
C. Construct a bypass harness for the electronic
service tool. Connect the bypass harness to ECM
connector J1
.
RefertoIllustration43forthebypassharness.
Note: This bypass directly connects the circuit for the
keyswitch to the ECM. The ECM will remain powered
until the con
nection to the unswitched battery line
“+” is disconnected. Remove the 20 Amp fuse from
the in-line fuse holder to power down the ECM. Do
Not connect
the bypass to the battery posts without
first removing the 20 Amp in-line fuse or do not
remove the bypass from the battery posts without
first remov
ing the 20 Amp in-line fuse.
Expected Result:
The electronic service tool is operating correctly.
Results:
•
Yes
Repair: Perform the following repair:
There is a pr
oblem in the wiring. Inspect the wiring
and fuses to the connector. Repair the wiring
and/or batteries, or replace the wiring and/or
batteries
, as required.
Verify that the repair eliminates the problem.
STOP.
•
No – Verify
thatthe20Ampfuseinthebypass
harness of the electronic service tool is not open. A
fuse that is open is a blown fuse. Proceed to Test
Step 6.
Test Step 6. Change Electronic Service
Tool Components.
A. If another electronic engine is available, connect
the electronic service tool to the other engine.
Ensure that th
esamecablesareused.
B. Turn the keyswitch to the ON position. Determine
if the electr
onic service tool operates correctly on
the other engine.
C. If another en
gine is not available in the shop, find
a different set of electronic service tool cables.
Ensure that the set of electronic service tool
cables is a c
omplete set.
D. Use the new set of cables and connect the
electronic
service tool to the Data Link connector.
E. Turn the keyswitch to the ON position.
F. If changing cables allows the electronic service
tool to operate properly, use the following
procedure:
a. Replace the pieces from the old set of cables
into the ne
w set of cables that operate. Replace
onepieceatatime.
b. Apply powe
r to the electronic service tool after
each of the pieces is replaced. Use this method
to find the faulty piece.
G. If changing cables does not allow the electronic
service tool to operate properly, connect another
electron
ic service tool.
H. Turn the keyswitch to the ON position.
Expected Result:
Result 1 T
he original electronic service tool works
on another engine.
Result 2 A
different electronic service tool works on
the original engine while the engine is being tested.
Results:
•
Result 1 – Proceed to Test Step 7.
•
Result 2
Repair: S
end the faulty electronic service tool for
repairs.
STOP.