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Wave Profile Inspection
- Remove the PCM. (See
PCM REMOVAL/INSTALLATION .)
- Connect WDS or equivalent to DLC-2 connector.
- Connect oscilloscope test leads to the following PCM connector terminals.
- (+) lead: PCM terminal 3V
- (-) lead: PCM terminal 4A
- Start the engine.
- Monitor RPM PID.
Courtesy of MAZDA MOTORS CORP.
- Inspect wave profile when idling engine.
- If wave profile or voltage are out of specifications, carry out the "Circuit Open/Short Inspection".
- PCM terminal: 3V(+) <--> 4A(-)
- Oscilloscope setting: 2.0V/DIV(Y), 20ms/DIV(X), DC range
- Vehicle condition: Idling
Courtesy of MAZDA MOTORS CORP.