Perkins 1104E Series Troubleshooting Manual page 125

RENR2696-01
Batteries give off flammable fumes which can ex-
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 the 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.
Refer to Illustration 43 for the bypass harness.
Note: This bypass directly connects the circuit for the
keyswitch to the ECM. The ECM will remain powered
until the connection 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 removing 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 problem 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 that the 20 Amp fuse in the bypass
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 the same cables are used.
B. Turn the keyswitch to the ON position. Determine
if the electronic service tool operates correctly on
the other engine.
C. If another engine 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 complete 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 new set of cables that operate. Replace
one piece at a time.
b. Apply power 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
electronic service tool.
H. Turn the keyswitch to the ON position.
Expected Result:
Result 1 The 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: Send the faulty electronic service tool for
repairs.
STOP.
125
Troubleshooting Section