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
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