Injector 4 always on.
 The culprit. [ http://www.datasheetcatalog.org/datasheet/HitachiSemiconductor/mXwuwxy.pdf ]
 The location. Chip on right circled in yellow is for injectors 4, 5 and 6. Same chip on left for injectors 1, 2 and 3.
 The fix. Replace. Just an FYI.
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