FAQ RX-8 ECU NVRAM, KAM & E-shaft Calibration

The RX-8 PCM / ECU has two memories that retain their content even when the ignition is switched off.

- NVRAM (Non Volatile Random Access Memory) stores the LTFT fuel trim for mixture composition

- KAM (Keep Alive Memory) saves the sensor data from MAF (air mass sensor),
of the eccentric shaft sensor, as well as the current and historical error codes.

Changed operating conditions are registered, but it takes some time until they also lead to a modification / trimming of the ECU.

The saved data can be deleted and reset.
The ECU starts to learn again the next time the engine is started (from a cooling water temperature of 80 degrees Celsius).


1. With the ignition off, press and hold the reset button on the trip meter.

2. Switch ignition key to ignition (do not start!)

3. Continue to hold the reset button until the odometer shows "TEST", then release. (Now the control lamps and the instruments are tested, etc.)

4. Press the button repeatedly until all tests have been completed.

5. Switch off ignition - done.

Reset cam & eccentric shaft sensor calibration

1. Switch ignition key to ignition (do not start!)

2. Then immediately press the brake pedal at least 20 times (at least 20 times) within a maximum of 10 seconds until the needle of the oil pressure indicator deflects up to half and returns.

3. Switch off ignition - done.

- In the case of very old software versions (before L) there is no deflection of the oil pressure display as a check for resetting the KAM.

- This procedure also calibrates the eccentric shaft sensor.

This procedure is important and should always be carried out when changing:
Eccentric shaft sensor, underdrive power pulleys or ignition coils.

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