Perkins NJ Series Troubleshooting Manual page 212

212
Troubleshooting Section
Test Step 1. Inspect Electrical Connectors
and Wiring
A. Inspect the following connectors:
• P1 OEM connector
• P2 OEM connector
B. Inspect the terminal connections on the glow
plug start aid relay. Refer to Troubleshooting,
"Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the
wires in the ECM connector that are associated
with the glow plug starting aid.
D. Check the screw for the ECM connector for the
correct torque of 5.0 N·m (44 lb in).
E. Check the harness for abrasion and pinch points
from the glow plugs back to the ECM.
F. Check that the fuses are not blown.
Expected Result:
All connectors, pins and sockets are correctly coupled
and/or inserted. The harness is free of corrosion,
abrasion and pinch points. The fuses are not blown.
Results:
• OK – The harness and the connectors appear to
be OK. Proceed to Test Step 2.
•
Not OK – There is a fault with the harness and
connectors.
Repair: Repair the connectors or the harness
and/or replace the connectors or the harness.
Ensure that all of the seals are correctly in place
and ensure that the connectors are completely
coupled. Replace blown fuses.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair has eliminated the fault.
STOP.
Test Step 2. Check for Active Diagnostic
Codes
A. Connect the Perkins EST to the diagnostic
connector.
B. Turn the keyswitch to the ON position.
Note: The engine has not been started at this Test
Step.
C. Use the Perkins EST to select the "Glow Plug
Override Test" in order to turn on the power for
the glow plugs.
D. Check for active diagnostic codes or recently
logged diagnostic codes.
Expected Result:
The following diagnostic code is active or recently
logged:
• 2246-06 Glow Plug Start Aid Relay Current above
normal
Results:
•
OK – The expected diagnostic code is active or
recently logged. Proceed to Test step 3.
• Not OK – An active diagnostic code or a recently
logged diagnostic code was not displayed.
Repair: Perform one of the following procedures:
• If an intermittent fault is suspected, use the
Perkins EST to perform a "Wiggle Test" in order
to locate intermittent connections.
• If there is a fault on the glow plug or a fault on
the starting aid and a diagnostic code is not
displayed then there may be a fault with the glow
plug switched power circuit or there may be an
open circuit in the relay coil circuit. The ECM
does not monitor the status of these tests. Refer
to Testing and Adjusting, "Glow Plugs - Test".
STOP.
Test Step 3. Check the Wiring for a Short
Circuit
A. Turn the keyswitch to the OFF position.
B. Remove the P1 connector from the ECM.
C. Check the connector, pins and the sockets for
corrosion or damage.
D. Check the resistance between P1:57 and each of
the pins on the P1 connector.
Expected Result:
The resistance between P1:57 and each of the pins
on the P1 connector is more than 10,000 Ohms.
SENR9982-01