Toyota 89661-52220: Yaris 1.4 D-4D Engine ECU Firmware

Toyota firmware 89661-52220 is cataloged for the Yaris P10 1.4L 8-valve D-4D diesel engine, code 1ND-TV, in the 55 kW (75 PS) configuration. The filename identifies a Bosch EDC15C9 engine control unit (ECU), with Bosch hardware number 0281010563 and calibration identifier 1037362666. This points to engine management firmware, rather than software for a transmission, body, or driver-assistance system.

What the EDC15C9 controls

The ECU coordinates the engine’s electronic fuel-injection and operating strategy. In practical terms, it uses sensor inputs and stored calibration data to manage diesel fueling and related engine functions as driving conditions change. Its decisions affect starting, idle quality, throttle response, torque delivery, fuel use, and emissions-related operation. The precise control routines and calibration values belong to this specific 1ND-TV application.

The catalog filename describes a stock vehicle and controller configuration. It does not name a modified, performance, or emissions-delete variant, so no such change should be inferred from the identifier alone. Likewise, the listed output of 55 kW or 75 PS identifies the cataloged engine configuration, not a claim that this firmware changes the factory power rating.

Using the identifiers in diagnostics

The complete set of identifiers helps distinguish this record from other Toyota calibrations. The Toyota number 89661-52220 is the cataloged ECU software number, while 0281010563 identifies the Bosch EDC15C9 hardware and 1037362666 is the calibration identifier shown in the filename. Comparing all three is more useful than matching only the 89661 prefix, which appears across many Toyota engine-control records.

For diagnosis, these identifiers provide a reference point when checking whether a vehicle’s ECU matches the cataloged Yaris diesel application. They do not establish compatibility with every Yaris, every 1.4-litre diesel, or other vehicles using an EDC15C9-family controller. A running problem still requires normal fault-code and system checks: the firmware number by itself does not identify a failed component or prove that a calibration update is needed.