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Lotus Service Notes Section EMR
ECU Integrity
P0601 Checksum
P0606 Watchdog
Description
These codes are used by the ECU to check the integrity of the software and calibration data.
P0601 checks that on power up the checksum for calibration data is the same as checksum saved on the
previous power down.
P0606 checks the watchdog timer after a defined period to see if it has reset. If the watchdog timer has not
reset then the code has entered an unplanned loop or condition stopping it resetting the timer.
Monitor
• P0601atECUpowerup
• P0606continuouslywhiletheenginerunning
Diagnostic Mask:
• TheMILwillbeilluminatedifafaultispresent.
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