Lotus 2004 Eleven Service Notes page 180

Lotus Service Notes
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 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
• P0601 at ECU power up
• P0606 continuously while the engine running
Notes:
The MIL will be illuminated if the fault is present for 2 consecutive trips.
P0601
P0606
Section EMP
Page 37