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Replace the electronic control unit by substitution with a known unit from a donor vehicle. Does the problem still exist?

April 26, 2017CONTROL donor electronic exist known problem replace substitution vehicle

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Replace the electronic control unit by substitution with a known unit from a donor vehicle. Does the problem still exist?

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YES: Cause of problem is unknown. Recheck fault diagnosis. If the vehicle is an automatic, check torque converter balance (see Attachment 2). (The attachment contains some figures.) NO: ——.