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Home >> Mazda >> 2003 >> 6 s, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls [Self-Diagnostics 3.0L] >> System Tests >> Procedures For Determining Location Of A Malfunction >> Powertrain Control Module (PCM)
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Powertrain Control Module (PCM)

  1. Check display of DTC U0121 and/or U0155, using scan tool. See Fig 1.
    Fig 1: DTC Table (Multiplex Communication System)
    G00221531Courtesy of MAZDA MOTORS CORP.
  2. Referring to PCM Malfunction Locator Table, determine malfunctioning part of CAN system. See Figure and Fig 2 .
Fig 2: PCM Malfunction Locator Table
G00221532Courtesy of MAZDA MOTORS CORP.
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