MOTOR GP-PISTON 4T3068 - Caterpillar

The Electronic Control Module (ECM) detects a fault with the air flow. If the air flow has been restricted, the ECM will generate this code.Note: This code is generated only when the engine has been running for three minutes. This code will be reset when the keyswitch is turned to the OFF position.System Response:The event code will be logged.A warning will appear on the display on the control panel.Possible Performance Effect:E172-1 A pressure differential of 7.5 kPa (1.1 psi) across the filter for 15 seconds will cause a warning to appear on the display on the control panel.E172-2 A pressure differential of 7.5 kPa (1.1 psi) across the filter for 30 seconds will cause the engine to be derated.Troubleshooting:Test Step 1. This event code normally indicates high air filter restriction. Refer to Systems Operation, Testing and Adjusting , "Air Inlet and Exhaust System - Inspect".Results:
OK - STOP