KOEO & KOER Self-Test

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

KOEO DTCs are set when a KOEO self-test is performed. KOEO self-test is a functional test of powertrain control module performed on demand with key on and engine off. KOEO self-test will perform checks on certain sensor and actuator circuits. A fault must be present at time of testing for KOEO self-test to detect fault. When a fault is detected, a DTC will be output on data link at end of test when requested by scan tool.

KOER DTCs are set when a KOER self-test is performed. KOER self-test is a function test of powertrain control module performed on demand with key on and engine running. A check for certain inputs and outputs is made during operating conditions at normal temperature. Brake Pedal Position (BPP), Transaxle Control Switch (TCS) and Power Steering Pressure (PSP) switch tests are part of KOER self-test and must be performed during this operation if applicable. A fault must be present at time of performing KOER self-test to detect fault. When a fault is detected, DTC will be output on data link at end of test when requested by scan tool.

Brake pedal position test checks ability of Powertrain Control Module (PCM) to detect a change of state in stoplight switch. Transaxle Control Switch (TCS) test checks ability of PCM to detect a change of state in overdrive OFF switch. Power steering switch test checks ability of PCM to detect a change of state in power steering fluid pressure.