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Home >> Jaguar >> 2019 >> XF S >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Electronic Engine Controls - INGENIUM I4 2.0L Diesel -- XE/(760)) >> Electronic Engine Controls - INGENIUM I4 2.0L Diesel (G1817213) >> Description And Operation >> Electronic Engine Controls >> Description >> Diesel Exhaust Fluid Injector - If Equipped

Diesel Exhaust Fluid Injector - If Equipped

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The Diesel Exhaust Fluid (DEF) injector is located in the exhaust system, downstream of the Diesel Particulate Filter (DPF). The DEF injector delivers a metered amount of DEF into the exhaust pipe.

The DEF injector works at high pressures to provide complete atomization of the injected DEF. This provides, that the Selective Catalyst Reduction (SCR) catalytic converter is operating at its optimum performance.

The DEF injector is activated by a Pulse Width Modulation (PWM) signal, controlled by the Powertrain Control Module (PCM). A signal duty cycle of 3.33 - 4 Hz determines the opening duration of the injector. The injector is designed to operate at a nominal operating pressure of 4.4 and 8.6 bar (64 and 125 psi). Heat, generated by the exhaust system, is dissipated through the injector by cooling fins built into the body of the injector.

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