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Japan Electronic Control System Co.: Wikis


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Japan Electronic Control System Co., Ltd. ("JECS") was formed in June 1973.[1] It was a joint venture between Robert Bosch GmbH, Nissan Motor Co. and Diesel Kiki Co., Ltd.. It enabled Nissan to use Bosch's engine control technology, and gave Bosch access to the Japanese market. JECS later expanded to manufacture many other automotive parts besides EFI systems.



  • 1956 Unisia established.
  • June 1973 JECS formed.
  • 1993 JECS merges with Atsugi Unisia, becoming Unisia JECS Corp.
  • November 1999 The French clutch company Valeo buys shares in Unisia JECS clutch division to gain entry to the Japanese market.[2] This closely follows Renault's purchase of a controlling interest in Nissan, April of the same year.
  • Mid 2001 Unisia JECS forms joint venture with Bosch Braking Systems Co. to produce power steering systems.[3]
  • October 2002 100% of Unisia JECS Corp. bought by Hitachi, delisted from stock market, renamed Hitachi Unisia Automotive, Ltd.. Previously, Nissan Motor, Hitachi and Robert Bosch owned 25%, 17% and 10% respectively.[4]
  • 2003 Unisia JECS opens factory in Shenzhen, China, to cut costs as demanded by Nissan.[5]
  • 2004 Hitachi Unisia Automotive Ltd. merged into Hitachi, Ltd.
  • 2004 Unisia JECS opens factory in Guangzhou, China, to make water pumps and valves.

Motorsport Sponsorship

Unisia JECS sponsored the Hasemi Motorsport team in JTCC and JGTC from 1991 until 2002. The Unisia JECS Skylines (GT500) and Silvias (GT300) also featured in video games & toys.


16-bit ECUs from JECS were produced for the 1993 Nissan_300ZX.



Electronic Fuel Injection

Mid 80's JECS LH-Jetronic ECU. 40 pin IC bottom left is Hitachi Motorola 6800 clone, 28 pin IC (socketed) immediately right is 16kB ROM containing maps. JECS logo bottom left.

Bosch first produced the Jetronic EFI system in 1967. K-Jetronic & L-Jetronic followed from around 1973[6] which is when Nissan became involved.


Early JECS systems were L-Jetronic, with Bosch moving vane airflow meters. These systems used a mixture of German & Japanese parts. The electronics were Japanese, the sensors often German, the fuel pumps/regulators made under license to Bosch by DENSO.


Late 90's JECS LH-Jetronic ECU. Much smaller, more integration, all custom ICs, maps no longer easily accessible. Unisia JECS logo bottom right and on main IC.

By the mid 80's, JECS were using LH-Jetronic, and the new Bosch hotwire mass airflow meter. The early JECS LH-Jetronic systems were based on a Motorola 6800 architecture, using a lot of Hitachi components. The earliest hotwire meters were still from Germany, but by the end of the eighties all of the system components (pumps, sensors, injectors, ECU) were being made in Japan.


  1. ^ "History of Bosch Group in Japan.". 2006-09-02.  
  2. ^ "Business Development Asia Auto Newsletter December 1999.". 2006-09-03.  
  3. ^ "Business Development Asia Auto Newsletter December 2000.". 2006-09-03.  
  4. ^ "Business Development Asia Auto Newsletter June 2002.". 2006-09-02.  
  5. ^ "Business Development Asia Auto Newsletter February 2002.". 2006-09-02.  
  6. ^ Siegel, Christine et al. (2006). Journal of Bosch History. Bosch. pp. 30–33.  


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