Diagnostic Tests: Notes

WARNING: DO NOT crank engine before replacement PCM is programed to immobilizer system or PCM will be severely damaged. If test procedures require replacement of PCM on a vehicle equipped with immobilizer system, vehicle must be sent to authorized Mazda dealer to have replacement PCM programed.

WARNING: While ignition is on, do not connect or disconnect battery, or any other electrical connector. Component damage may result.

CAUTION: When battery is disconnected, vehicle computer memory system may lose memory data. Driveability problems may exist. After disconnecting battery or replacing PCM, drive vehicle to enable PCM to relearn driveability. Inform your customer that they may experience driveability different from what they are accustomed to until PCM completes relearn function.

NOTE: Vehicle with immobilizer system can be identified by a solid urethane ignition key head.

NOTE: If Powertrain Control Module (PCM) replacement is instructed in following testing, always ensure PCM connectors and ground circuits are okay. If either are suspect, repair and repeat testing to confirm PCM malfunction.

NOTE: Before performing any diagnostic test, refer to WARNINGS, CAUTIONS and NOTES under SELF-DIAGNOSTIC SYSTEM for system functions and system diagnostic procedures.

NOTE: If more than one DTC is stored at PCM memory, always perform diagnosis from first DTC stored at PCM memory, unless stated otherwise in test procedure.

NOTE: If component testing procedure is not covered in DTC Self-Diagnosis article, for component testing, see SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article.

NOTE: For identification of circuits, terminals and wire colors referenced in the testing procedure. See MIATA in WIRING DIAGRAMS article.

NOTE: In some instances a short to ground or a short to power may cause damage to control modules. Do not replace control modules until testing proves these conditions do not exist. Also verify that ground circuits have good continuity to ground.

NOTE: Check connectors within a suspect circuit for loose connection, loose female terminals, terminals pushed out of their connectors, water or terminal corrosion.

NOTE: Self-diagnostic test procedures are for use with New Generation Star (NGS) scan tool. If a generic scan tool is used, ensure scan tool is certified to OBD-II standard.