P051

Code PO51:

PCM Circuit:

DESCRIPTION:
The PCM PROM contains data which is essential in running the engine and transaxle. Code P051 check the integrity of this data.

The integrity of the data is checked by adding up the data in all locations of the PROM. This is called the checksum. If the checksum does not equal what it should, then the code is set. The checksum is only checked when the ignition is turned 'OFF' and if it does not match, the code will set the next time the ignition is turned 'ON'.

SETTING CODE PO51
This code can set due to several problems, for example:

- A bad connection between the PCM and PROM.

- Incorrect data in the PCM due to electromagnetic discharge, or a faulty PROM.

- An internal PCM problem.