5032766 JOHNSON BOLT (8X55mm)

automatic calibration of all pressure sensors whenever the ECM is powered and the engine is off for at least five seconds. Cranking the engine during the first five seconds causes the ECM to abort the calibration attempt. A manual calibration should be performed if a pressure sensor is replaced.During an automatic pressure sensor calibration, the ECM checks all pressure sensors against an acceptable range. If any pressure sensor reading is outside the acceptable range, the previous calibration value is used. The ECM then calibrates all pressure sensors against the atmospheric pressure sensor.A pressure sensor calibration will not be successful if there are active diagnostic codes with an FMI of 03 and/or 04.Note: The Generator Set has a jumper wire between terminals 6 and 9 on the Engine Control Switch (ECS). This jumper wire provides power to the Generator Set Control (GSC+) when the battery disconnect switch is closed and the ECS is in the OFF/RESET position. Unless a timer is installed in the circuit, this jumper wire also provides power to the key switch input of the engine ECM when the battery disconnect switch is closed and the ECS is in the OFF/RESET position. The timer interrupts power to the key switch input of the engine ECM when the battery disconnect switch is closed and the ECS is in the OFF/RESET position. Cycling power to the key switch input of the ECM will reset the ECM and all active diagnostic codes. The bottom dial on the timer should be set to 0.7. The middle dial on the timer should be set to 3 seconds. The top dial on the timer should be set to E.Test Step 1. Check for "ACTIVE" Diagnostic Codes.
Turn the ECS to the OFF/RESET position.
Turn the battery disconnect switch to the OFF position.
Connect the Caterpillar Electronic Technician (ET) to the service tool connector J60/P60.
Turn the ECS to the STOP position. The engine should be off.
Check for active diagnostics.Expected Result:There should be no active diagnostics.Results:
OK - There were no active diagnostic codes. Proceed to test step 2.
Not OK - A diagnostic code is present. A pressure sensor with an active diagnostic code cannot be calibrated.Repair: Perform the appropriate troubleshooting procedure.STOPTest Step 2. Perform a Manual Calibration of the Sensors.
Select the sensor calibration on the Cat ET. The ECM will perform a manual pressure sensor calibration when this screen is entered.Expected Result:The Cat ET screen shows that the pressure calibration was completed.Results:
OK - The Cat ET screen shows that the pressure calibration was completed.Repair: Reset the system and check for any diagnostic codes.STOP
Not OK - All pressure sensors could not be calibrated. Proceed to test step 3.Test Step 3. Determine the Cause of Failed Manual Calibration.
Check if any pressure sensors have an active diagnostic code. A pressure sensor calibration will not be successful if there are active diagnostic codes with an FMI of 03 and/or 04.
Verify that the correct sensor has been installed.
Check the display status screen on the Cat ET for the pressure sensor reading.
Turn the ECS to the OFF/RESET position.Expected Result:The ECM should read crankcase pressure as 8 kPa (1.1 psi) from the atmospheric pressure reading. The ECM should read turbocharger compressor inlet pressure as 8 kPa (1.1 psi) from the atmospheric pressure reading. The ECM should read engine oil pressure as 27 kPa (4 psi) from the atmospheric pressure reading. The ECM should read turbocharger compressor outlet pressure as 15 kPa (2 psi) from the atmospheric pressure reading. The atmospheric pressure reading should be steady. The atmospheric pressure in your area will be displayed from 5 kPa (0.7 psi).Results:
OK - Repeat manual calibration of the sensors. Proceed to test step 2.
Not OK - There is a problem with the wiring harness and/or with the sensor. Inspect the components for damage, for corrosion or for abrasion. Repair the components and/or replace the components.Repair: Perform the appropriate troubleshooting procedure.STOP