Circuit Description

See CODE P0401  - INSUFFICIENT EXHAUST GAS RECIRCULATION (EGR) FLOW DETECTED. Code is set when 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.