Perkins 1104E Series Troubleshooting Manual page 98

98
Troubleshooting Section
•
No – The +5 V sensor diagnostic code is no longer
active when the harness is disconnected. Either
the harness or a sensor that is attached to the
harness is causing the problem. Reconnect the
ECM engine harness connector. Proceed to Test
Step 4.
Test Step 4. Disconnect The +5 V Sensors
While Active Diagnostic Codes Are Being
Monitored.
A. Connect the electronic service tool to the
diagnostic connector.
B. Turn the keyswitch to the ON position while the
engine is OFF.
C. Access the active diagnostic code screen on
the electronic service tool. Verify that one of the
following diagnostic codes is active:
• 262-03 5 Volt Sensor Supply voltage more than
normal
•
262-04 5 Volt Sensor Supply voltage less than
normal
D. Disconnect the following sensors one at a time:
•
Engine oil pressure sensor J201/P201
•
Intake manifold pressure sensor J200/P200
E. Wait for 30 seconds after each pressure sensor
is disconnected while the electronic service tool
is being monitored in order to verify that the
disconnection of a specific sensor deactivates the
+5 V diagnostic code.
Note: When the sensors are disconnected and
the keyswitch is in the ON position, open circuit
diagnostic codes will be active or logged when the
+5 V diagnostic codes are no longer active. This is
normal. Clear these diagnostic codes after this test
step is completed.
Expected Result:
The original +5 V diagnostic code remains active.
Results:
•
Yes – The +5 V diagnostic code is still active. The
harness is the cause of the problem. Leave the
sensors disconnected. Proceed to Test Step 5.
•
No – The +5 V diagnostic code is not active when
a specific sensor is disconnected.
Repair: Reconnect the sensor that is suspected
of causing the problem. If the problem returns
after the reconnection of the sensor, disconnect
the sensor. If the problem disappears after the
disconnection of the sensor, replace the sensor.
Clear all diagnostic codes. Verify that the repair
eliminates the problem.
STOP.
RENR2696-01