Circuit Description

See CODE P0401 - INSUFFICIENT EXHAUST GAS RECIRCULATION FLOW DETECTED . Code is set when Exhaust Gas Recirculation (EGR) gas temperature sensor value is high. Engine not yet at normal operating temperature. Possible causes are:

• EGR valve stuck open.
• EGR Vacuum Switching Valve (VSV).
• EGR VSV open circuit.
• EGR gas temperature sensor short circuit.
• ECM.