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Engine Control Module: Testing and Inspection

How to use the Engine Signal Monitor (SST Mazda Part# 49 9200 162).

Engine Signal Monitor Installed:





1. Connect the engine signal monitor between the control unit and the engine harness using the adapter (SST Mazda Part# 49 9200 167).
2. Turn the selector switch and monitor switch to select the terminal number.
3. Check the terminal voltage.

CAUTION: DO NOT APPLY VOLTAGE TO THE TERMINALS OF THE SST.

ECU INSPECTION

Protective Cover Removal:





1. Lift up the floormat in front of the passenger's seat.
2. Remove the protective cover.
3. Connect the engine signal monitor (SST Mazda Part# 49 9200 162) to the engine control unit.
4. Check the voltage at each terminal.
5. If the input and output devices and related wiring are normal, but the engine control unit is incorrect, replace the engine control unit.

Engine Control Unit Terminal Voltages:




Engine Control Unit Terminal Voltages:




Engine Control Unit Terminal Voltages:













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