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Home >> BMW >> 1988 >> 535is Automatic >> Repair and Diagnosis >> Engine Performance >> System >> MOTRONIC CEC System >> Testing >> Test 3: MOTRONIC Control Unit (MCU)

Test 3: MOTRONIC Control Unit (MCU)

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  1. Check circuits to MCU. Repair any open or shorted circuits. If circuits are okay, connect BMW service test unit and perform appropriate L-Jetronic tests in FUEL SYSTEMS section.
  2. In order to ensure that source of defect is only in control unit, it is recommended to replace unit for comparison.
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