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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (ENGINE CONTROLS - SELF-DIAGNOSTICS - INTRODUCTION)QUICK TESTKOER ON-DEMAND SELF-TESTPERFORMING SELF-TEST
1999 Mazda 626 ES, 2.5 D, Standard

Performing Self-Test

1999 Mazda 626 ES, 2.5 D, StandardSECTION Performing Self-Test
WARNING: This page is about a different car, the 2000 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

To perform self-test, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps:

  • Select VEHICLE & ENGINE SELECTION menu.
  • Select NEW VEHICLE, YEAR & MODEL.
  • Select DIAGNOSTIC DATA LINK.
  • Select PCM-POWERTRAIN CONTROL MODULE.
  • Select DIAGNOSTIC TEST MODE.
  • Select KOER ON-DEMAND SELF-TEST.
  • Start engine and allow to idle.
  • Follow operating instructions from scan tool menu.
  • Record DTCs and perform appropriate system test. After test is complete, cycle ignition switch before performing other self-tests or driving vehicle.

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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.