Toyota-Auris-E150-1.4-D-4D-Bosch-EDC16C31—396135-TUN-EGR-OFF.rar: ECU Calibration

Toyota-Auris-E150-1.4-D-4D-Bosch-EDC16C31—396135-TUN-EGR-OFF.rar is a cataloged engine-control calibration for a Toyota Auris E150 1.4 D-4D diesel with a Bosch EDC16C31 controller. Its TUN EGR OFF label identifies a modified tune intended to disable exhaust gas recirculation control.

What EGR off means in practice

Exhaust gas recirculation routes a controlled amount of exhaust back into the engine’s intake under suitable operating conditions. This lowers combustion temperatures and helps reduce nitrogen oxide emissions. An EGR-off calibration is intended to prevent normal EGR operation through the engine software. The filename does not reveal the exact calibration changes or how the valve and diagnostic monitoring are handled.

Disabling EGR changes an emissions-control function and can increase nitrogen oxide emissions. Its effect on driving behavior depends on the rest of the tune and the condition of the vehicle. The label alone does not establish a power gain or a specific change in fuel consumption.

The EDC16C31 controller and this catalog entry

The Bosch EDC16C31 is a diesel engine-control unit. It uses sensor inputs and calibration maps to manage functions such as fuel injection and engine torque, alongside emissions-related controls. On the Auris 1.4 D-4D application named here, EGR control is one part of that broader engine-management role.

The identifier 396135 distinguishes this catalog entry, while TUN marks it as a tuned variant rather than a stock file. No stock counterpart or additional modification is established by this filename. For diagnostic work, an EGR-related fault should be assessed in the context of the installed calibration as well as the valve, wiring and engine hardware. An altered emissions calibration may also affect road-use compliance depending on local rules.