PCC1302 PowerCommand Code 488 Intake Manifold Temperature High Solution

This instruction show you guide on how to repair PCC1302 PowerCommand trouble code 488 intake manifold temperature High (Warning).Engine intake manifold temperature has exceeded 185° F (85° C) for more than 90 seconds.

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Possible Causes:
1 High ambient temperature
2 Radiator blocked
3 Louvers are closed or damaged
4 Charge air cooler fins or radiator fins are damaged or obstructed
5 Fan belt is broken or loose
6 Fan drive or fan controls are malfunctioning
7 Inaccurate coolant temperature sensor
8 Fault simulation feature is enabled
9 Incorrect threshold setting

Diagnosis and Repair:
1 High ambient temperature
a Use a thermocouple to verify air temperature entering intake louver of generator.
b Reduce loads or recirculation of discharge air to generator in elevated ambient.

2 Radiator blocked
a Inspect radiator for debris or blockages.
b Remove blockage or winterfront as applicable.

3 Louvers are closed or damaged
a Inspect louvers for proper operation.
b Repair or replace if damaged.
c Check louver motor for proper operation.
d If louver motor is operational, verify louver shutter thermostat is operational.

4 Charge air cooler fins or radiator fins are damaged or obstructed
a Inspect for dirt, debris or obstructions.
b Clean if necessary.

5 Fan belt is broken or loose
a Inspect belt(s) for damage, wear, and proper tension.
b Repair or replace if damaged or worn.
6 Fan drive or fan controls are malfunctioning
a Inspect pullies and belt tensioner for damage or wear.
b Repair or replace if damaged or worn.

 

7 Inaccurate coolant temperature sensor
a Use a thermocouple or similar device to measure coolant temperature near sender and compare to coolant temperature displayed.
b Verify the temperature sender resistance and compare to specifications called out in the engine manual.
c Verify continuity from temperature sender wire to engine ECM. Harness resistance should be less than 5 Ohms.
d Repair or replace faulty components or wiring.

8 Fault simulation feature is enabled
a Use the service tool to connect to the engine ECM and verify fault override toggle is disabled.
b Reconfigure generator and disable fault overrides.

9 Incorrect threshold setting
a Use the service tool to connect to the engine ECM and verify fault threshold settings and compare to the specifications called out in the engine manual.
b Verify ECM and PCC calibration number and revision is correct.
c Recalibrate the engine ECM to reset the threshold settings.

 

More repair cases please refer to:PCC1302 PowerCommand trouble repair