C9.3 Engines for Caterpillar Built Machines Sensor Calibration Required

Sensor Calibration Required - Test

C9.3 Engines for Caterpillar Built Machines [KENR5393]

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C9.3 Engines for Caterpillar Built Machines Component Location

ELECTRICAL AND STARTING SYSTEM

SENSOR GP

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C9.3 Engines for Caterpillar Built Machines Sensor Signal (Analog, Active) - Test

C9.3 Engines for Caterpillar Built Machines Sensor Signal (Analog, Passive) - Test

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System Operation Description:

Use this procedure to troubleshoot a problem with a pressure sensor calibration or use this procedure if any one of the diagnostic codes in Table 1 is active or easily repeated.

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Table 1
Diagnostic Codes Table
CDL Code	Code Description	Comments
100-13	Engine Oil Pressure Sensor : Calibration Required	The code is logged. During a manual calibration, the pressure offset value is set to 0 kPa (0 psi). During an automatic calibration, the pressure offset value is set to the previous calibration value.
274-13	Atmospheric Pressure Sensor : Calibration Required	The code is logged. During a manual calibration, the pressure offset value is set to 0 kPa (0 psi). During an automatic calibration, the pressure offset value is set to the previous calibration value.
460-13	Fuel Pressure Sensor - After Fuel Filter : Calibration Required	The code is logged. During a manual calibration, the pressure offset value is set to 0 kPa (0 psi). During an automatic calibration, the pressure offset value is set to the previous calibration value.
1785-13	Intake Manifold Pressure Sensor : Calibration Required	The code is logged. During a manual calibration, the pressure offset value is set to 0 kPa (0 psi). During an automatic calibration, the pressure offset value is set to the previous calibration value.

The Electronic Control Module (ECM) checks the signals from certain reference pressure sensors when the keyswitch is turned to the ON position. The key must remain in the ON position for 2 seconds in order for the ECM to check the signals from the sensors. During this time, the ECM compares the signal from the atmospheric pressure sensor with the signal from the following pressure sensors:

Fuel pressure sensor
Oil pressure
Intake manifold air pressure

The sensor signal must be within the specified range of the signal from the reference pressure sensor. If a sensor signal is out of the range, the corresponding fault code becomes active.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Codes Note: The engine coolant temperature must be greater than 0° C (32° F) before beginning this procedure. A. Establish communication between AVSpare Electronic Technician (ET) and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active. C. Look for an active -13 code or for a logged -13 code.	Codes	Result: There is an active or there is a logged -13 code for only one sensor. Proceed to Test Step 2. Result: There is an active or there is a logged -13 code for more than one sensor. Proceed to Test Step 3.
2. Inspect the Suspect Sensor Connector A. Turn the keyswitch to the OFF position. B. Inspect the connector of the suspect sensor. Verify that there is no moisture. C. Turn the keyswitch to the ON position. D. Monitor the status parameter for the suspect sensor on Cat ET. Wiggle the wiring at the suspect sensor connector.	Connector	Result: The value of the status parameter does not remain steady. Repair: Perform the following procedure: 1. Disconnect the suspect sensor connector. 2. Remove any moisture from the outside of the connector. Check for moisture and corrosion inside the connector. Verify that the seals for the wires are sealing correctly. Refer to Troubleshooting, "Electrical Connector - Inspect", if necessary. 3. If necessary, repair the connector or replace the connector. 4. Reconnect the connector. Verify that the connection is secure. 5. Monitor the status parameter for the suspect sensor on Cat ET. Wiggle the wiring at the suspect sensor connector. Verify that the signal is steady. 6. Turn the keyswitch to the OFF position. Clear the -13 diagnostic code. 7. Turn the keyswitch to the ON position. 8. Monitor the diagnostic codes on Cat ET. Check for an active -13 diagnostic code for the suspect sensor. 9. If the -13 code is active, replace the sensor. Verify that the problem is resolved. STOP Result: The value of the status parameter remains steady. Repair: Perform the following procedure: 1. Disconnect the suspect sensor connector. 2. Check for corrosion inside the connector. Verify that the seals for the wires are sealing correctly. Refer to Troubleshooting, "Electrical Connector - Inspect", if necessary. 3. If necessary, repair the connector or replace the connector. 4. Reconnect the connector. Verify that the connection is secure. 5. Monitor the status parameter for the suspect sensor on Cat ET. Wiggle the wiring at the suspect sensor connector. Verify that the signal is steady. 6. Turn the keyswitch to the OFF position. Clear the -13 diagnostic code. 7. Turn the keyswitch to the ON position. 8. Monitor the diagnostic codes on Cat ET. Check for an active -13 diagnostic code for the suspect sensor. 9. If the -13 code is active, replace the sensor. Verify that the problem is resolved. STOP
3. Inspect the Connector for the Reference Sensor A. Turn the keyswitch to the OFF position. B. Inspect the connector of the suspect reference sensor. Verify that there is no moisture. C. Turn the keyswitch to the ON position. D. Monitor the status parameter for the suspect reference sensor on Cat ET. Wiggle the wiring at the suspect sensor connector.	Connector	Result: The value of the status parameter does not remain steady. Repair: Perform the following procedure: 1. Disconnect the suspect sensor connector. 2. Remove any moisture from the outside of the connector. Check for moisture and corrosion inside the connector. Verify that the seals for the wires are sealing correctly. Refer to Troubleshooting, "Electrical Connector - Inspect", if necessary. 3. If necessary, repair the connector or replace the connector. 4. Reconnect the connector. Verify that the connection is secure. 5. Monitor the status parameter for the suspect sensor on Cat ET. Wiggle the wiring at the suspect sensor connector. Verify that the signal is steady. 6. Turn the keyswitch to the OFF position. Clear the -13 diagnostic codes. 7. Turn the keyswitch to the ON position. 8. Monitor the diagnostic codes on Cat ET. Check for active -13 diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active. 9. If more than one -13 code is active, replace the reference sensor. STOP Result: The value of the status parameter remains steady. Repair: Perform the following procedure: 1. Disconnect the suspect reference sensor connector. 2. Check for corrosion inside the connector. Verify that the seals for the wires are sealing correctly. Refer to Troubleshooting, "Electrical Connector - Inspect", if necessary. 3. If necessary, repair the connector or replace the connector. 4. Reconnect the connector. Verify that the connection is secure. 5. Monitor the status parameter for the suspect reference sensor on Cat ET. Wiggle the wiring at the suspect sensor connector. Verify that the signal is steady. 6. Turn the keyswitch to the OFF position. Clear the -13 diagnostic codes. 7. Turn the keyswitch to the ON position. 8. Monitor the diagnostic codes on Cat ET. Check for active -13 diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active. 9. If more than one -13 code is active, replace the reference sensor. Verify that the problem is solved. STOP

Test Step 1.

The procedure corrected the issue. Return to service.

Results:

The procedure did not correct the issue. -
Repair: Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

STOP