AXLE AR 2Q8518 - Caterpillar

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C15 sensor locations on the right side
(4) Pressure sensor for the intake valve actuator
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C13 sensor locations on the left side
(1) Intake manifold pressure sensor (Boost)
(2) Atmospheric pressure sensor
(3) Engine oil pressure sensor
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Sensor connector
Test Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF 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, "Electrical Connectors - Inspect" 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 of 6.0 N m (55 lb in).
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 or 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 the Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes. Note: Wait at least 15 seconds in order for the diagnostic codes to become active.Expected Result:There is an active -03 or -04 diagnostic code.Results:
OK - A -03 diagnostic code is active. Proceed to Test Step 4.
OK - A -04 diagnostic code is active. Proceed to Test Step 3.
Not OK - No diagnostic code is active.Repair: The problem is no longer present. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOPTest Step 3. Disconnect the +5 V Sensors while you Monitor the Active Diagnostic Codes
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes. Note: Wait at least 15 seconds in order for the diagnostic codes to become active.
Disconnect the following sensors at the sensor connector:
Atmospheric pressure sensor
Intake manifold air pressure (Boost)
Engine oil pressure sensor
Oil pressure sensor for the intake valve actuator
Wait for 15 seconds after each sensor is disconnected. Check for an active diagnostic code on the electronic service tool. Expected Result:The -04 diagnostic code deactivates.Results:
OK - The -04 diagnostic code deactivates. The diagnostic code is not active after 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. Reconnect all wires to the original configuration. Clear all diagnostic codes. Verify that the repair eliminates