PISTON AS 3240498 - Caterpillar

Thoroughly inspect ECM connector (2). Also, thoroughly inspect each of the connectors for sensors (1), (3), (4), and (5) .Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 4 g01024457
P2 ECM connector (P2-15) Boost pressure sensor (P2-17) Sensor return (P2-28) Engine oil pressure sensor (P2-40) Fuel pressure sensor (P2-57) Atmospheric pressure sensor (P2-72) +5 V Supply
Illustration 5 g01159881
Pressure sensor connector (typical example) (A) +5 V Supply (B) Sensor return (C) Signal
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit. Also perform the pull test on all pressure sensor connectors that are in the circuit.
Check the allen head screw on each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harness and wiring for abrasion and for pinch points from the sensors back to the ECM.Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 3.
Not OK - There is a problem with the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.Note: Wait at least 15 seconds in order for the diagnostic codes to become active.
Determine if the problem is related to a 03 diagnostic code or a 04 diagnostic code.Expected Result:There are no active diagnostic codes.Results:
OK - No diagnostic code is active.Repair: The problem is no longer present. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A 262-03 diagnostic code is active. Proceed to Test Step 3.
Not OK - A 262-04 diagnostic code is active. Proceed to Test Step 4.Test Step 3. Check the Supply Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect all of the following sensors at the sensor connectors:
Boost pressure sensor
Engine oil pressure sensor
Fuel pressure sensor
Atmospheric pressure sensor
Turn the keyswitch to the ON position.
Measure the voltage between terminal A (5 V sensor supply) and terminal B (sensor return) at the sensor connectors.
Turn the keyswitch to the OFF position.
Reconnect all of the sensors.Expected Result:The voltage is 5.0 0.2 VDC.Results:
OK - The voltage is correct.Repair: Replace all wires to the original configuration. Clear all diagnostic codes. Check for active diagnostic codes. If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The voltage is not 5.0 0.2 VDC. The voltage is incorrect. Proceed to Test Step 5.Test Step 4. Disconnect the +5 V Sensors and Check for