SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 59 (ENGINE CONTROLS [SELF-DIAGNOSTICS 3.0L])SYSTEM TESTSPROCEDURES FOR DETERMINING LOCATION OF A MALFUNCTIONPOWERTRAIN CONTROL MODULE (PCM)
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Powertrain Control Module (PCM)

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Powertrain Control Module (PCM)
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  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.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.