Table 160
Troubleshooting Test Steps
Values Results
4. Bypass the Wiring for the Diagnostic Connector
A. Disconnect the wires from pin A and pin B of the diagnostic
connector.
Note: If the diagnostic connector is mounted on the engine, per-
form steps B to D. If the diagnostic connector is mounted off the
engine, perform step E.
B. Disconnect the wires from P2:56 and P2:64.
C. Fabricate a jumper wire in order to connect pin A of the diag-
nostic connector to P2:56.
D. Fabricate a jumper wire in order to connect pin B of the diag-
nostic connector to P2:64.
E. Fabricate a jumper wire in order to connect pin “A” of the diag-
nostic connector to battery+ and pin “B” to the battery-.
F. Connect the electronic service tool to the diagnostic connector
that is on the engine harness or on the application.
G. Turn the keyswitch to the ON position. The power lamp should
illuminate on the communications adapter.
Other devi-
ces are OK
Result: The power lamp is illuminated. The fault is in the
harness.
Repair: Repair the faulty harness or replace the faulty
harness.
Use the electronic service tool in order to clear all logged di-
agnostic codes and then verify that the repair eliminates the
fault.
Result: The power lamp is not illuminated.
Proceed to Test Step 6.
5. Check the Data Link Connections
A. Turn the keyswitch to the OFF position.
B. Disconnect the communications adapter from the diagnostic
connector.
C. If the diagnostic connector is installed on the application, dis-
connect connector P1 from the ECM. Check the resistance be-
tween P1:20 and pin “D” on the diagnostic connector. Check the
resistance between P1:28 and pin “E” on the diagnostic
connector.
D. If the diagnostic connector is installed on the engine, discon-
nect P2 from the ECM. Check the resistance between P2:47 and
pin “D” on the diagnostic connector. Check the resistance between
P2:55 and pin “E” on the diagnostic connector.
Less than 10
Ohms
Result: The resistances are less than 10 Ohms.
Proceed to Test Step 6.
Use the electronic service tool to clear all logged diagnostic
codes. Verify that the repair eliminates the fault.
Result: At least one of the resistances is greater than 10
Ohms.
Repair : Repair the connectors and/or the harness, or re-
place the connectors and/or the harness. Ensure that all of
the seals are correctly in place and ensure that the connec-
tors are correctly connected.
Use the electronic service tool in order to clear all logged di-
agnostic codes and then verify that the repair eliminates the
fault.
6. Change the 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 elec-
tronic service tool operates correctly on the other engine.
C. If another engine is not available, obtain a replacement commu-
nications adapter and a replacement set of cables. Ensure that the
cables for the electronic service tool are a complete set.
Power to the
comms
adapter
Result: The original electronic service tool works on another
engine.
Proceed to Test Step 7.
Result: A different electronic service tool works on the origi-
nal engine while the engine is being tested.
Repair: Send the faulty electronic service tool for repairs.
(continued)
UENR4469-36 289
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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