Product Manual B

6. Troubleshooting3-2018
89A051X877 (Issue 7) Copyright © 2018 Cummins Inc.
6.10 Code 488 - Intake Manifold Temperature High
(Warning)
Logic:
The engine intake manifold temperature has exceeded the temperatures below for
more than 90 seconds:
Models C45 N6, C50 N6 and C60 N6: 158 °F (70 °C)
Models C70 N6, C80 N6 and C100 N6: 167 °F (75 °C)
Possible Causes:
1. High ambient temperature
2. Enclosure air intake blocked
3. Coolant level is below specification
4. Radiator blocked
5. Enclosure air discharge blocked
6. Fan belt is broken or loose
Diagnosis and Repair:
1. High ambient temperature
a. Reduce loads or recirculation of discharge air to generator in elevated
ambient.
2. Enclosure air intake blocked
a. Inspect for dirt, debris, or obstructions.
b. Remove blockage or snow/ice buildup as applicable.
3. Coolant level is below specification
a. Check coolant level.
b. Add coolant as necessary.
4. Radiator blocked
a. Inspect for dirt, debris or obstructions.
b. Remove blockage or winterfront as applicable.
5. Enclosure air discharge blocked
a. Inspect for dirt, debris, or obstructions.
b. Remove blockage or snow/ice buildup as applicable.
6. Fan belt is broken or loose
a. Inspect belt(s) for damage, wear, and proper tension.
b. Repair or replace if damaged or worn.