KOEO & KOER SELF-TEST Codes

WARNING: This page is about a different car, the 1995 Mazda MX-6 and 1995 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

PCM outputs codes one digit at a time. Record codes in order received. These codes indicate current faults in system and should be serviced in order of appearance. See DIAGNOSTIC TROUBLE CODE REFERENCE to identify correct TEST to perform.

If using VOM, pay careful attention to length of pauses in order to read codes correctly. A 1/2-second pause occurs between number of sweeps in a digit. A 2-second pause occurs between digits in a code. A 4-second pause occurs between each code. KOEO codes are separated from Continuous Memory codes by a 6-second delay, a 1/2-second sweep (separator) and another 6-second delay. See Figure.

If using MIL/CHECK ENGINE light, diagnostic trouble codes are displayed as flashes.

Scan tester, if used, will count pulses and display them as a digital code. STAR tester cannot be used to read 3-digit codes. Super Star II or New Generation Star tester can be used to read 3-digit codes. If using Super Star II tester, 3-digit codes will only be displayed in fast code mode. If slow code mode is used, display will be blank.