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WikiBosch ME7History

Bosch ME7

Revision 3

by llandowtuninguk@gmail.com
Add Volkswagen, SEAT and Škoda 1.8T ME7.5 examples

This is a historical revision. Read the current page or return to its history.

Page organisation in this revision
Page type
ECU hub
Subject
ECUs
Parent
Bosch
Applies to
No ECU-specific applicability
Tool groups
Not recorded in this older revision
Manufacturers
Not recorded in this older revision

What is Bosch ME7?

Bosch ME7 is a family of electronic engine management systems for petrol engines. It combines electronic throttle control with fuel injection and ignition control. ME7 was used on naturally aspirated and turbocharged engines; many applications use multipoint port injection.

ME7 uses a torque-oriented control strategy: it estimates engine torque and coordinates requests for it, while also calculating the fuel needed for the air entering the engine. The details vary with the engine and software. See Audi SSP 198 and Bosch's ME-Motronic guide.

How torque control works

The accelerator pedal is interpreted as a request for torque, rather than a direct mechanical command to open the throttle. The ECU also considers requests and limits from functions such as idle control, cruise control, the gearbox and traction or stability control, as fitted.

Using its engine model and calibrated maps, the ECU estimates torque and the cylinder air charge needed to meet the permitted request. It controls the electronic throttle and, on turbocharged applications, can also control boost. Faster torque changes can be made through ignition timing or, when required, injection or cylinder cut. The calculated torque is an estimate, not a direct measurement from a torque sensor.

Fuel injection and ignition

ME7 also calculates a fuel quantity. It estimates the air charge from the available sensors and engine model, selects a target air-to-fuel ratio (lambda), then calculates the required fuel mass and injector opening time using injector calibration and operating corrections. When conditions allow, oxygen-sensor feedback adjusts fuelling to help reach the target. The commanded injector time does not directly measure how much fuel was actually delivered.

The ECU also controls ignition timing and, where fitted, uses knock-sensor feedback to adjust it. Other functions can include variable valve timing, emissions controls and fault diagnostics, depending on the application.

Example vehicles and engines

These are representative documented examples, not a complete fitment list. Model year, market, engine code and equipment can change the ECU fitted.

  • Audi S3 and TT 1.8T — APY and AJQ four-cylinder examples use ME7.5; see the Bosch application catalogue.

  • Audi S4 and RS4 2.7 biturbo V6 — AGB and ASJ examples use ME7.1; Audi S6 4.2 V8 AQJ is another ME7.1 example in the same catalogue.

  • Volkswagen Golf Mk4 (1J) 1.8T — AUM (150 PS) and AUQ (180 PS) manual-transmission examples are listed with ME7.5 in Alientech's application list.

  • SEAT León Mk1 and Toledo Mk2 (1M) 1.8T — AUQ examples are listed with ME7.5 in TRW's vehicle application list.

  • Škoda Octavia Mk1 (1U) 1.8T — the AUQ engine is listed with ME7.5 in the same TRW list.

  • BMW X5 E53 4.4i — the M62TU 4.4-litre V8 uses ME7.2, as shown in BMW's X5 training material.

  • Volvo S70 2.4 turbo — the 2000 B5244T five-cylinder example is shown with ME7 in the Volvo service information.

  • Peugeot 307 1.6 16V — the TU5JP4 / NFU four-cylinder is documented with ME7.4.4 in Peugeot's engine information; the same document also lists M7.4.4, so check the individual vehicle.

  • Fiat Bravo II 1.4 16V T-Jet — the 198 A4.000 engine is listed with ME7.9.10 in Alientech's application list.

What this means when tuning

Torque requests, air charge, boost, lambda, injector calibration and ignition interact. A change in one area can be limited or affect another, so compare requested and observed values and work from definitions for the exact ECU hardware and software. Internal torque and load values may be scaled differently between versions.

Family scope

The S4Wiki tuning reference discusses ME7.1 and ME7.5 and includes S4 M-box/L-box examples. Keep those examples attached to their software context.

Where to start

Read ME7 getting started and Motronic abbreviations. Choose a variant below for its scope notes and the inherited family guidance.

Sources

Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.