(1) Possible reasons.
1) Intake and exhaust systems.
2) Engine speed/timing.
3) Air pressure sensor.
4) Turbocharger outlet pressure sensor fuel configuration and/or “FRC fuel limit value”.
5) Personality module.
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6) Fuel quality. 7) Valve adjustment.
(2) Recommended measures.
1) Intake and exhaust systems.
① Check whether there is any throttling or leakage in the air intake system.
a. Connect the Caterpillar Electronic Technology (Cat ET) to the service tool connector.
b. Compare the readings on the air pressure sensor and the turbocharger compressor inlet pressure sensor.
c. Check the filter for throttling.
d. Check whether there is load shedding operation or alarm.
e. Visually inspect the system for throttling and/or leaks.
② Confirm that the turbocharger is not faulty.
③ Check whether the exhaust system is throttled.
④ Repair any leaks found. Remove any discovered throttling. Replace any damaged parts.
2) Engine speed/timing.
① Check the calibration of the engine speed/timing sensor, please refer to the “Calibration of the
Engine Speed/Timing Sensor” section.
② Check whether the positioning between the crankshaft and the camshaft drive gear is correct.
3) Air pressure sensor. Check the air pressure sensor for dirt and/or debris. Remove any dirt and/or
debris. The air pressure sensor should be between 50~ between 100kPa.
4) Turbocharger outlet pressure sensor, fuel configuration and/or “FRC fuel limit value”.
① When the engine is running at full load, monitor the “Fuel Configuration”, “Rated Fuel Limit” and
“FRC Fuel Limit” on the Cat ET. If the “Fuel Configuration” is equal to the “Rated Fuel Limit” and less
than the “FRC Fuel Limit”, it means that the electronic components are working properly. Otherwise,
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it
will be Proceed to the next step.
②Monitor whether the “boost pressure” and “atmospheric pressure” on Cat ET are working properly.
When the engine is stopped, “boost pressure” should be 0kPa. NOTE: FRC failure will cause black
smoke only when accelerating. When running smoothly, an FRC failure will not cause black smoke.
5) Personality module. Verify that the correct personality module is installed.
6) Fuel quality. Check fuel quality. If necessary, change the fuel to one with a higher cetane number.
When the temperature is lower than 0℃, check whether there is condensation Solid fuel (wax).
7) Valve adjustment. Check the valve clearance adjustment.