1990 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE

Control Units

CONTROL UNITS LOCATION

Component Location
Anti-Lock Brake Control Unit Under right side of driver's seat.
Central Processing Unit In joint/fuse box.
Cruise Control Unit Under dash, near steering column. See Figure .
Electronic Transaxle Control Unit Near joint/fuse box. See Figure & Figure .
Electrical Load Control Unit Under center of dash, near ECU. See Figure & Figure .
Engine Control Unit (ECU) Under center of dash. See Figure & Figure .
Fuel Pump Control Unit In right rear corner of trunk. See Figure .
Knock Control Unit On right side of firewall. See Figure & Figure .
Passive Shoulder Belt Control Unit Under passenger's seat.
Power Steering Control Unit Under left side of driver's seat.
Four Wheel Steering (4WS) Control Unit Under left side of driver's seat. See Figure .
Factory Service Tools

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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.

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