ROCKER ARM GP 4898223 - Caterpillar

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Typical schematic
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P1 ECM connector (P1-2) 5 V sensor supply (P1-3) Sensor return
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Location of ECM connectors
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Sensor connector (Pin A) Sensor supply (Pin B) Sensor return (Pin C) Signal
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Sensor location (1) Atmospheric pressure sensor
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Left side view 3606 and 3608 (2) Turbocharger compressor outlet pressure sensor
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Top view 3612 and 3616 (3) Turbocharger compressor outlet pressure sensorTest Step 1. Inspect Electrical Connectors and Wiring
Turn the local/remote switch on the control panel to the OFF/RESET position.
Thoroughly inspect the J1/P1 ECM connector and the J2/P2 ECM connector. Inspect all of the connectors that are associated with the circuit.Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
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 2.
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 local/remote switch on the control panel to the LOCAL position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes. Look for the following diagnostic codes:
262-3
262-4 Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic code is active.Repair: The problem is no longer present. If the problem is intermittent, refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - Either the 262-3 or 262-4 diagnostic code is active at this time. Proceed to Test Step 3.Test Step 3. Disconnect the 5 Volt Sensors while you Monitor the Active Diagnostic Codes
Monitor the active diagnostic code screen on Cat ET while you disconnect each 5 Volt sensor at the sensor connector. Check for an active 262-3 code or an active 262-4 code.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Disconnect the following sensors one at a time:
Atmospheric pressure sensor
Turbocharger outlet pressure sensor
Turn the local/remote switch on the control panel to the OFF/RESET position.Expected Result:The diagnostic code deactivates when a particular sensor is disconnected.Results:
OK - The 262-3 or 262-4 diagnostic code deactivates when a particular sensor is disconnected.Repair: Connect the suspect sensor. If the code returns, replace the sensor. Connect all of the connectors. Verify that the problem is resolved.STOP
Not OK - The 262-3 or 262-4 diagnostic code remains active after all of