Perkins NJ Series Troubleshooting Manual page 163

SENR9982-01
Repair: Repair the faulty connectors or the
harness and/or replace the faulty connectors or the
harness. Ensure that all of the seals are correctly in
place and ensure that the connectors are correctly
coupled.
If a sensor must be replaced or the sensor must be
reinstalled, complete all of the following tasks:
•
Lubricate the O ring with clean engine lubricating
oil.
• Ensure that the plug for the sensor has a seal
inside the connector body. If a seal is damaged
or missing, replace the seal.
• Ensure that the sensor is fully seated into the
engine before tightening the bracket bolt.
• Ensure that the connector is latched.
• Ensure that the harness is correctly secured,
and ensure that the harness is attached to the
harness clip.
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 and Recently Logged Diagnostic
Codes
A. Turn the keyswitch to the OFF position.
B. Connect the Perkins Electronic Service Tool (EST)
to the diagnostic connector.
C. Turn the keyswitch to the ON position. If the
engine will start, then run the engine.
D. Use the Perkins EST in order to monitor active
diagnostic codes or recently logged diagnostic
codes.
Expected Result:
One or more of the following diagnostic codes are
active or recently logged:
• 190-8 Engine Speed Sensor abnormal frequency,
pulse width, or period
• 342-8 Secondary Engine Speed Sensor abnormal
frequency, pulse width, or period
Results:
• 190-8 – Proceed to Test Step 4.
• 342-8 – Proceed to Test Step 3.
• Not OK – No active diagnostic codes or recently
logged diagnostic codes are displayed. STOP.
Test Step 3. Check the Harness Between
the Secondary Speed/Timing Sensor and
the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector. Disconnect the
connector for the primary speed/timing sensor.
Disconnect the connector for the secondary
speed/timing sensor.
C. Check the resistance between P2:53 to the
secondary speed/timing sensor terminal 2. The
resistance should be less than 2.0 Ohms.
D. Check the resistance between P2:10 to the
secondary speed/timing sensor terminal 1. The
resistance should be less than 2.0 Ohms.
Expected Result:
The readings agree with the values that are listed
above.
Results:
• OK – The harness is not OPEN circuit. Proceed
to Test Step 5.
•
Not OK – The harness or the connector is an open
circuit or high resistance.
Repair: Repair the faulty connectors or the
harness. Replace the faulty connectors or
the harness. Reconnect all sensor and ECM
connectors. Ensure that all of the seals are
correctly in place. Ensure that all connectors are
correctly coupled.
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 4. Check the Harness Between
the Primary Speed/Timing Sensor and
the ECM.
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector. Disconnect the
connector for the primary speed/timing sensor.
Disconnect the connector for the secondary
speed/timing sensor.
C. Check the resistance between P2:52 to the
secondary speed/timing sensor terminal 2. The
resistance should be less than 2.0 Ohms.
163
Troubleshooting Section