C27 Petroleum Generator Set Engines Caterpillar

Pressure Sensor - Calibrate

Usage:

C27 EGG

Use this procedure to troubleshoot a problem with a pressure sensor calibration. Also 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
J1939 Code and Description	Conditions that Generate the Code	System Response
100-13 Engine Oil Pressure : Calibration Required	During the last calibration attempt, a problem has been detected.	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.
101-13 Engine Crankcase Pressure : Calibration Required	During the last calibration attempt, a problem has been detected.	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.
108-13 Barometric Pressure : Calibration Required	During the last calibration attempt, a problem has been detected.	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.
411-13 Engine Exhaust Gas Recirculation Differential Pressure : Calibration Required	During the last calibration attempt, a problem has been detected,	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.
3358-13 Engine Exhaust Gas Recirculation Inlet Pressure : Calibration Required	During the last calibration attempt, a problem has been detected.	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.
3563-13 Engine Intake Manifold #1 Absolute Pressure : Calibration Required	During the last calibration attempt, a problem has been detected.	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 pressure sensors when electrical power is restored to the ECM. Electrical power must be restored for two seconds in order for the ECM to check the signals from the sensors.

The signal from the barometric pressure sensor, crankcase pressure sensor, and NRS differential pressure sensor are compared to a value stored in the ECM. The appropriate fault code is active if either signal is outside of the specified range.

The ECM compares the signal from the intake manifold pressure sensor with the signal from the barometric pressure sensor.

The signal's from the inlet fuel pressure sensor and the outlet fuel pressure sensor of the secondary fuel filter base are compared. The signal from the inlet pressure sensor must be within the specified range of the signal from the outlet pressure sensor. If the sensor signal is out of the range, the diagnostic trouble code is logged.

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
Calibration Tolerances for Pressure Sensors
CDL Code	Sensor Reference	Minimum Allowable Reference Value	Maximum Allowable Reference Value	Maximum Allowable Range For Calibration	Minimum Allowable Calibration Value	Maximum Allowable Calibration Value
100-13	Barometric pressure sensor	48 kPa (7 psi)	122 kPa (17.7 psi)	15 kPa (2.2 psi)	45 kPa (6.5 psi)	122 kPa (17.7 psi)
101-13	N/A	0 kPa (0 psi)	0 kPa (0 psi)	15 kPa (2.2 psi)	−20 kPa (−2.9 psi)	20 kPa (2.9 psi)
411-13	N/A	0 kPa (0 psi)	0 kPa (0 psi)	7 kPa (1.0 psi)	−7 kPa (−1 psi)	7 kPa (1 psi)
3358-13	Barometric pressure sensor	48 kPa (7 psi)	122 kPa (17.7 psi)	15 kPa (2.2 psi)	33 kPa (4.8 psi)	122 kPa (17.7 psi)
3563-13	Barometric pressure sensor	48 kPa (7 psi)	122 kPa (17.7 psi)	15 kPa (2.2 psi)	33 kPa (4.8 psi)	122 kPa (17.7 psi)

Note: The engine coolant temperature must be greater than 0° C (32° F) before this procedure is performed.

Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.

Check for active calibration codes:

Use Caterpillar Electronic Technician (ET) to check for calibration codes that are active or logged.

If the 108-13 Barometric Pressure : Calibration Required is active, perform the following procedure on the barometric pressure sensor prior to troubleshooting calibration codes for the other sensors.

Perform the following procedure in order to troubleshoot active calibration codes:

Inspect the connector of the suspect sensor. Verify that no moisture or corrosion is present in the connector assembly. Thoroughly inspect the connector seal for damage. Reconnect the connector.
Monitor the status parameter for the suspect sensor on Cat ET. Wiggle the wiring at the suspect sensor connector.
While you wiggle the wiring, check that the value of the status parameter remains steady during the test.
If the value of the status parameter does not remain steady during the test, perform the necessary repairs to the wiring and/or the sensor connector.
Verify that the problem is resolved.
If the value of the status parameter remains steady during the test, use Cat ET to check for an active calibration code. If the code is active, replace the suspect sensor.
Verify that the problem is resolved.
Inspect the connector of the reference sensor. Verify that no moisture or corrosion is present in the connector assembly. Thoroughly inspect the connector seal for damage. Reconnect the sensor connector.
Monitor the status parameter for the reference sensor on Cat ET. Wiggle the wiring at the reference sensor connector.
While you wiggle the wiring, check that the value of the status parameter remains steady during the test.
If the value of the status parameter does not remain steady during the test, perform the necessary repairs to the wiring and/or the sensor connector.
Verify that the problem is resolved.
If the value of the status parameter remains steady during the test, use Cat ET to check for an active calibration code. If the code is active, replace the suspect sensor.
Verify that the problem is resolved.