VALVE GP-CHECK 4576251 - Caterpillar

disconnected. Ignore all other diagnostic codes and only look for codes relating to the suspect sensor.
Access the "Active Diagnostic Codes" screen on the electronic service tool and check for an active XXXX-3 diagnostic code for the suspect sensor.
Turn the keyswitch to the OFF position.Results:
An XXXX-4 diagnostic code was active before disconnecting the P2 connector. An XXXX-3 diagnostic code for the suspect sensor became active after the P2 connector was disconnected. - The fault is in the wiring between the 62-pin connector and P2 connector.Repair: Replace the faulty wiring. Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.STOP
The XXXX-4 diagnostic code is still present with the P2 connector disconnected. - Repair: Perform the following repair:
Make sure that the latest flash file for the application is installed in the ECM. Refer to Troubleshooting, "Flash Programming".
Contact the Technical Communicator at a Cat Dealer.Note: This consultation can greatly reduce the repair time.
If the Technical Communicator recommends the use of a replacement ECM, install a replacement ECM. Refer to Troubleshooting, "Replacing the ECM".
Use the electronic service tool to recheck the system for active diagnostic codes.
If the fault is eliminated with the replacement ECM, reconnect the suspect ECM.
If the fault returns with the suspect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 7. Check the Sensor Signal Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the suspect sensor connector.
Turn the keyswitch to the ON position.
Measure the voltage between the sensor signal terminal and the ground terminal on the harness connector for the suspect sensor.
Turn the keyswitch to the OFF position.Expected Result:The voltage measurement should be 4.9 VDC to 5.1 VDC.Results:
OK - The voltage is within the expected range. There may be a fault in the sensor.Repair: Perform the following repair:
Temporarily connect the suspect sensor.
Turn the keyswitch to the ON position.
If the diagnostic code remains active, replace the sensor.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOP
Not OK - The voltage is not within the expected range.
If the suspect sensor is the intake manifold temperature sensor, the coolant temperature sensor, the fuel temperature sensor, or the exhaust gas temperature sensor, proceed to Test Step 8.
If the suspect sensor is the air inlet temperature sensor, the DOC inlet temperature sensor or the DPF inlet temperature sensor, proceed to Test Step 10.Test Step 8. Check the Sensor Signal Voltage at the 62-Pin Connector
Turn the keyswitch to the OFF position.
Disconnect the 62-pin connector.
Turn the keyswitch to the ON position.
Measure the voltage between the suspect sensor signal terminal and the ground terminal on the 62-pin connector on the harness between the engine and the ECM.
Turn the keyswitch to the OFF position.Expected Result:The voltage measurement should be 4.9 VDC to 5.1 VDC.Results:
OK - The voltage is within the expected range. The fault is in the engine