Perkins NJ Series Troubleshooting Manual page 175

SENR9982-01
B. Disconnect the P532 connector from the fuel rail
pump solenoid.
C. Disconnect the P2 connector from the ECM.
D. Measure the resistance between P2:26 and P2:25.
E. Measure the resistance between P2:25 and
voltage +.
F. Measure the resistance between P2:25 and the
voltage (-).
G. Measure the resistance between P2:26 and
voltage +.
H. Measure the resistance between P2:26 and
voltage (-).
Expected Result:
The resistance is greater than 20,000 Ohms.
Results:
• OK – The harness has no short circuit to supply
or ground. The ECM is suspect. Proceed to Test
Step 7.
• Not OK – The harness has a short circuit.
Repair: Repair the harness and connectors or
replace the faulty harness and connectors.
Connect the P532 connector to the fuel rail pump
solenoid.
Connect the P2 connector to the ECM.
Turn the keyswitch to the ON position.
Use the Perkins EST in order to perform the fuel
rail pump solenoid test.
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 7. Check the ECM and the
Harness
A. Turn the keyswitch to the OFF position.
B. Disconnect the P532 connector from the fuel rail
pump solenoid.
C. Insert a jumper wire across P532.
D. Turn the keyswitch to the ON position.
E. Use the Perkins EST in order to perform the fuel
rail pump solenoid test.
F. Use the Perkins EST in order to monitor the status
screen.
Expected Result:
A 1779-06 diagnostic code is displayed.
Results:
• OK – The ECM and the ECM connections function.
The solenoid is not an open circuit. Recheck the
diagnostic codes. Proceed to Test Step 5.
• Not OK – The ECM is suspect. Proceed to Test
Step 8.
Test Step 8. Check the ECM Function
A. Temporarily connect a test ECM. The test ECM
should be programmed with the correct software.
All parameters should be set to the same value of
the suspect ECM.
B. Replace all connectors.
C. Connect the Perkins EST to the diagnostic
connector.
D. Turn the keyswitch to the ON position.
E. Use the Perkins EST in order to monitor the status
screen.
F. Use the Perkins EST in order to perform the fuel
rail pump solenoid test.
G. Monitor the status screen on the Perkins EST.
Expected Result:
The fault is eliminated.
Results:
• OK – If the fault is eliminated with the test ECM,
reconnect the suspect ECM. If the fault returns
with the suspect ECM, replace the ECM. Use the
electronic service tool in order to clear all logged
diagnostic codes and then verify that the repair
eliminates the fault. STOP.
175
Troubleshooting Section