P112

DTC P112:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) contains a data storage unit which can save critical data even when battery power is removed. This unit, the Electrically Erasable Programmable Read Only Memory (EEPROM) is used by the PCM to store Throttle Position (TP) Sensor/Idle learned values, Transaxle Adapt values, Transaxle Oil Life Index, and Cruise Control Lash/Learn.

The EEPROM has several locations available to store this information. If the PCM detects a problem in one location of the EEPROM, it will store the data in another location. If the PCM runs out of good locations in the EEPROM to store data, it will set Code P112.

The PCM stores the same data in its Keep Alive Memory so that even if the EEPROM is bad and Code P112 sets, the operator will not notice any difference in vehicle operation. Even after a Code P112 is set, the PCM will continue to look for good locations in the EEPROM in which to store data and if it finds good locations, Code P112 will become a history code.

The EEPROM is soldered into the PCM and cannot be serviced separately. If a current Code P112 is set, the PCM must be replaced.

NOTES ON FAULT TREE
1. If Code P112 is set current, the PCM cannot find another location to store the data, so the PCM must be replaced.
2. Cycle the ignition to give the PCM a chance to find a place to store the data. If the code resets, no place can be found so the PCM must be replaced.