Product Manual B

6. Troubleshooting 3-2018
86 A051X877 (Issue 7)Copyright © 2018 Cummins Inc.
3. Air intake restriction above specification
a. Inspect air filter for obstruction. Replace if necessary.
6.4 Code 143 - Engine Oil Pressure Low (Warning)
Logic: Engine oil pressure is below the low oil pressure warning threshold.
Possible Causes:
1. Lubricating oil level is low
2. External leak
Diagnosis and Repair:
1. Lubricating oil level is low
a. Check the oil level. Add oil, if necessary.
2. External leak
a. Inspect the engine and surrounding area for external oil leaks.
b. If a leak is present, contact your Cummins service representative.
6.5 Codes 146 and 151 - Engine Coolant
Temperature High (Warning or Shutdown)
Logic:
Code 146: Engine coolant temperature has exceeded the warning threshold
and duration parameters set in the ECM or control.
Code 151: Engine coolant temperature has exceeded the shutdown (alarm)
threshold for high coolant temperature.
Possible Causes:
1. High ambient temperature
2. Enclosure air intake blocked
3. Coolant level below specification
4. Blocked radiator
5. Blocked enclosure air discharge
6. Broken or loose fan belt
Diagnosis and Repair:
1. High ambient temperature
a. Reduce loads or recirculation of discharge air to generator set.
2. Blocked enclosure air discharge
a. Inspect for dirt, debris, or obstructions.
b. Remove blockage or snow/ice buildup if applicable.