This overhead cam 3.0 Mitsubishi engine was used in many different Chrysler platforms. (Plymouth Acclaim, Chrysler LeBaron, Dodge Caravan, Chrysler Town and Country etc). The vehicle being tested is a 1990 Chrysler's TC by Maserati, which is really just a LeBaron with different tags on it.

Engine Performance Diagnostics chapter 18 pages 9-12

symptoms 50

  • check engine light (code 26)
  • no driveability complaints

fix 50

  • replaced engine computer and all 6 fuel injectors

test shown enh 50

  • how to scope test a pair fired injection system
  • fuel injector current and voltage waveforms
  • why amperage was so much higher during initial start up
  • how to identify main computer powers and grounds on a wiring diagram
  • how to test computer powers and grounds
  • how to perform a proper ground to ground voltage drop test
  • how to determine if you voltmeter has a good connection

Tools used

  • scan tool
  • Picoscope (labscope)
  • digital multimeter
  • inductive low amp probe
  • back-probing tools

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(Chapters 17, 18 and 19) Fuel Injector Testing

Related videos:

How to test for shorted fuel injectors (1987-1994 GM Cars):


Lexus fuel injector failing when hot, misfire (fixed with snow):


Rough idle, false MAP codes intermittent no start (shorted injectors) GM :


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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