Perkins NJ Series Troubleshooting Manual page 209

SENR9982-01
C. Turn the keyswitch to the ON position.
D. Monitor the status screen on the Perkins EST
while the jumper wire is being disconnected and
reconnected.
Expected Result:
When the jumper wire is connected the status of the
PTO mode switches should be "CLOSED".
When the jumper wire is disconnected the status of
the PTO mode switches should be "OPEN".
Results:
• OK – The switch is faulty.
Repair: Replace the switch. Use the electronic
service tool in order to clear all logged diagnostic
codes and then verify that the repair has eliminated
the fault.
STOP.
• Not OK – There is a fault with the harness between
the PTO mode switches and the engine ECM.
Proceed to Test Step 5.
Test Step 5. Measure the Resistance of
the Cables at the ECM
A. Turn the keyswitch to the OFF position.
B. Connect the cables to the suspect switch.
C. Disconnect the P1 connector from the ECM.
D. Measure the resistance between P1:35 and
the appropriate pin on the P1 connector for the
suspect switch. Refer to illustration 87.
E. Repeat the procedure for each of the PTO mode
switches.
Expected Result:
The measured resistance should be less than 10
Ohms with the switch ON.
The measured resistance should be more than
20,000 Ohms with the switch OFF.
Results:
•
OK – Proceed to Test Step 6.
• Not OK – There is a fault with the wires between
the suspect switch and the P1 connector.
Repair: Repair the wires or replace the wires.
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 6. Test the Engine ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 OEM connector from the ECM.
C. By using a suitable pin removal tool, temporarily
remove the wires from the suspect switch socket.
Use a suitable pin removal tool to temporarily
remove the wires from the P1:35.
D. Insert a jumper wire between the suspect switch
socket and P1:35.
E. Turn the keyswitch to the ON position.
F. Monitor the status screen on the Perkins EST
while the jumper wire is being disconnected and
reconnected.
Expected Result:
The status screen should display an OPEN condition
with the switch in the OFF position.
The status screen should display a CLOSED
condition with the switch in the ON position.
Results:
•
OK – The ECM is working correctly. STOP.
• Not OK – The ECM is not working correctly.
Repair: Temporarily connect a test ECM.
The test ECM should be programmed with the
correct software. All parameters should be set to
the same values as the suspect ECM.
If the fault is eliminated with the test ECM,
reconnect the suspect ECM.
If the fault returns with the suspect ECM, then the
suspect ECM is faulty.
Replace the suspect ECM.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair has eliminated the fault.
STOP.
209
Troubleshooting Section