Diesel Engine Troubleshooting

Exhaust Gas Control System

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The exhaust gas control system is provided to improve warm-up and heater performance. This system actuates the exhaust gas control valve VSV, which is attached to the exhaust manifold. It increases the exhaust pressure to increase the exhaust temperature and engine load, in order to improve warm-up and heater performance.

pic1 116 Exhaust Gas Control System

The exhaust gas control system operates when the warm-up switch is ON, and all the conditions listed below have been met.

Operation Conditions
– The EGR is operating.
– The coolant temperature is below 70°C.
– The ambient temperature is below 5°C.
– A minimum of 10 seconds have elapsed after starting the engine.
– The engine speed and fuel injection quantity are in the state shown in the graph below.

pic1 117 Exhaust Gas Control System

Written by Jack

March 11th, 2019 at 6:15 am

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