Perkins NJ Series Troubleshooting Manual page 137

SENR9982-01
Expected Result:
The resistance that is measured is less than 10
Ohms.
Results:
• OK – The resistance is less than 10 Ohms.
Proceed to Test Step 6.
•
Not OK – The resistance is greater than 10 Ohms.
Repair: Perform the following repair:
Repair the connectors and/or the harness, or
replace the connectors and/or the harness. Ensure
that all of the seals are correctly in place and
ensure that the connectors are completely coupled.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
Test Step 6. Change the Perkins
Electronic Service Tool (EST)
Components.
A. If another electronic engine is available, connect
the Perkins EST to the other engine. Ensure that
the same cables are used.
B. Turn the keyswitch to the ON position. Determine
if the Perkins EST operates correctly on the other
engine.
C. If another engine is not available, obtain a
replacement communications adapter and a
replacement set of Perkins EST cables. Ensure
that the set of Perkins EST cables are a complete
set.
D. Install the replacement communications adapter
and Perkins EST cables and connect to the
diagnostic connector.
E. Turn the keyswitch to the ON position.
F. If changing the communications adapter or the
Perkins EST cables allows the Perkins EST to
operate correctly, use the following procedure:
a. Replace the components from the old set of
Perkins EST cables into the new set of cables
that operate. Replace one component at a time.
b. Apply power to the Perkins EST after each of
the components is replaced. Use this method
to find the faulty component.
G. If changing the Perkins EST cables does not allow
the Perkins EST to operate correctly, connect
another Perkins EST.
H. Turn the keyswitch to the ON position.
Expected Result:
Result 1 The original Perkins EST works on another
engine.
Result 2 A different Perkins EST 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 Perkins EST for repairs.
STOP.
Test Step 7. Connect a Perkins EST and
the ECM to another Battery.
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 un-
til the 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.
Note: Refer to Troubleshooting, "Electronic Service
Tools" for details of the bypass harness.
137
Troubleshooting Section