Engine Control Module: Testing and Inspection

Trim Panel Removal:

1. Remove the front side trim on the passenger's side.

Signal Monitor Installed:

2. Connect the Engine Signal Monitor (SST Mazda Part# 49 9200 162) to the engine control unit using the adapter (Mazda Part# 49 9200 167).
3. Measure the voltage at each terminal.

Engine Control Unit Mounting:

4. If any engine control unit terminal voltage is incorrect, check the input or output device and related wiring. If they are normal, replace the engine control unit.

Engine Signal Monitor:

CAUTION: Never apply voltage to SST terminals A and B.