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voltage. Base values for the fueling and ignition timing are each retrieved from a three-dimensional map, and certain sensor values are applied as correction factors, for example, to enrich fueling during wide-throttle acceleration or on cold startup. The MEMS firmware also features a limp-home capability (referred to in the literature as "limited operating strategy") that will substitute a nominal value for any non-operative sensor.
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315:. Fault codes may only be cleared by commanding the ECU via the diagnostic port. Testing of MEMS equipped cars was originally possible with the "COBEST", "Microcheck", and "Microtune" test equipment provided to Rover dealerships and service centers. The Rover TestBook system later became available to provide similar functionality as well.
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Automotive and
Industrial Electronics Group (AIEG), who were responsible for the ECU manufacturing. The software run on the ECU was designed and written by Rover Group engineers. The "Modular" characteristic of the ECU was represented in the hardware design, which featured a common core with multiple
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In 1985, Rover Group made the decision to develop a new electronic engine management system in-house, and from its inception, the system was intended to be flexible enough for use with future engine designs. It was also intended to improve quality and reliability and to consume less power and occupy
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disc. The system may be run in either open-loop or closed-loop mode (with the latter requiring a lambda sensor). Additional features include an engine speed limiter, overrun fuel cut-off, startup fuel enrichment (both during cranking and after startup), and fueling compensation for battery voltage.
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was developed at the same time as MEMS. This system was known as "ERIC", which stands for "Electronically
Regulated Ignition and Carburetion". The development of the MEMS and ERIC systems became the first in-house units for ignition and fuel-control, areas which had previously been undertaken by
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Like other electronic engine management systems, MEMS reads data from a number of sensors and computes an appropriate fueling rate and ignition advance/retard. The ECU samples engine speed, manifold absolute pressure, coolant temperature, intake air temperature, throttle position, and battery
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Lucas Engine
Management Systems, a division of Lucas Industries. While the development of MEMS and ERIC occurred at the same time, there was no commonality between the two systems - while MEMS used an Intel micro-controller, the ERIC system used the
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vacuum line be run to the ECU enclosure. In MEMS 1.6 and 1.9, this MAP sensor is the
Motorola 5141550T02, and the vacuum line feeding it passes through a vapor trap to prevent admission of fuel vapor into the ECU.
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mmunications. On earlier cars, the diagnostic port used a circular three-pin connector (type 172202 manufactured by TE Connectivity), where later cars switched to the standardized 16-pin ISO J1962 connector type.
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Some operating parameters are learned by the ECU over time, such as the optimal IAC valve position for a stable idle. This accommodates slight differences in engine wear and tune between different engines.
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Supports sequential injection (with a fallback to batch-fired injectors in the event of a cam position sensor failure.) Also supports variable valve timing control in the form of Rover VVC.
379:. Twenty-second International Symposium on Automotive Technology and Automation. Florence, Italy: Joint Publications Research Service (published 26 September 1990). pp. 127–134
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There are now various open and closed source applications for PC and mobile phones in order to interact with these ECUs, rather than having to purchase an old
Testbook tool.
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device; the development of MEMS used a PC based toolset, while that of ERIC used a Unix based toolset; the two teams working on MEMS and ERIC were totally independent.
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were standardized, early versions of MEMS use a proprietary diagnostics protocol and signaling scheme. This protocol is known as ROSCO, which is an abbreviation for
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running at 12 MHz and featuring 8KB of on-chip ROM for storage of code and data and 232 bytes of general-purpose RAM. The main connector is a 36-pin
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344108 ("Econoseal"), and its mating connector (used in the wiring harness) is a TE Connectivity 344111. On earlier versions of the system, a
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Introduced in mid-1994, version 1.9 of the system uses a redesigned mechanism for idle air control and supports multipoint injection.
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less underbonnet space than previous engine management systems. The system first became available in 1989, when it was fitted to the
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in the 1990s. As its name implies, it was adaptable for a variety of engine management demands, including electronically controlled
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control). The abbreviations "SPi" and "MPi" refer to the single-point and multi-point injection configurations, respectively.
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2.0L. Over the next seven years, the system appeared on cars across Rover's model lineup, including the Mk VI and Mk VII
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Designed with capability to control emissions-related equipment. ECU has two connectors (one 36-pin and one 18-pin).
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Finned aluminum enclosure normally with single 36-pin connector, some have a 36-pin and 18-pin connector.
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Crankshaft position and speed are determined by input signals generated by poles in a
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When the system detects a fault, a corresponding fault code is stored in the ECU's
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optional add-on modules. In 1990, these modular features included the following:
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76:, is an electronic control system used on engines in passenger cars built by
108:. It was also paired with Rover engines used by other marques, such as the
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Crabb, D.; Duncan, H.M.; Hiljemark, S.L.; Kershaw, T.J. (14–18 May 1990).
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First version to enter production. Not designed for use in vehicles with
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520:"Automotive electronics in Europe -- the real issue is cost"
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Among the different revisions of MEMS were the following:
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Supports EOBD3 (European On Board
Diagnostics version 3)
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Automotive Engine
Management and Fuel Injection Manual
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16:Electronic control system for Rover car engines
291:Because it was designed before industry-wide
132:design was a joint venture between Rover and
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204:was internal to the ECU, requiring that an
31:MEMS 1.6 units, one with its cover removed
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547:Rover Product Training College (1989).
373:MEMS (Modular Engine Management System)
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212:An analogous system for engines with a
54:Electronic automobile engine management
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447:"Diagnosing and fixing vacuum leaks"
575:MGF TF MEMS ECU Motorola (MEMS 1.9)
84:as well as single- and multi-point
553:(Videotape). Rover Service TV Unit
252:. ECU has single 36-pin connector.
88:(both with and without electronic
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150:Batch-fired (bank) fuel injectors
70:Modular Engine Management System
20:Modular Engine Management System
192:The processor in the ECU is an
580:Rover MEMS diagnostic protocol
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518:Williams, Mike (April 1990).
495:MGF and TF Restoration Manual
493:Parker, Roger (2013-01-01).
340:White, Charles (July 1997).
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397:Rees, Chris (2013-08-01).
163:Exhaust gas recirculation
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497:. The Crowood Press UK.
141:Base programmed ignition
590:16-pin diagnostic cable
605:Fuel injection systems
585:3-pin diagnostic cable
154:Automatic transmission
401:. Haynes Publishing.
118:Rover K-series engine
474:"T16 MEMS Electrics"
344:. Haynes Techbooks.
293:on-board diagnostics
250:catalytic converters
147:Second fuel injector
144:Single fuel injector
529:(1990–8). Dataquest
527:Research Newsletter
313:non-volatile memory
235:magnetic reluctance
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550:Rover MEMS Service
423:"MGF MEMS 1.9 ECU"
610:Engine components
399:The Magnificent 7
116:models using the
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112:and several
106:MG F / MG TF
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59:Release date
37:Manufacturer
451:Web Memsfcr
287:Diagnostics
214:carburettor
168:Purge valve
110:Lotus Elise
82:carburetion
78:Rover Group
41:Rover Group
599:Categories
557:2014-01-28
533:2015-10-12
456:2023-05-12
432:2023-05-12
383:2014-01-27
322:References
202:MAP sensor
194:Intel 8096
159:Pulse air
225:Function
134:Motorola
124:Hardware
114:Caterham
104:and the
90:ignition
45:Motorola
303:ervice
182:control
176:sensing
170:control
156:control
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348:
523:(PDF)
477:(PDF)
377:(PDF)
174:Knock
72:, or
499:ISBN
403:ISBN
346:ISBN
299:ver
262:1.6:
256:1.3:
246:1.2:
128:The
102:Mini
74:MEMS
68:The
62:1989
51:Type
274:2J:
268:1.9
188:(s)
130:ECU
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297:Ro
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