DTC 112

DTC 112 Chart:

EEPROM Location:

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 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 DTC 112.
The PCM stores the same data in its keep alive memory so that even if the EEPROM is bad and DTC 112 sets, the operator will not notice any difference in vehicle operation. Even after a DTC 112 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, DTC 112 will become a history code.
The EEPROM is part of the PCM PROM and can be serviced separately. If a current DTC 112 is set, the PCM PROM must be replaced.

DTC 112 WILL SET WHEN
All available EEPROM memory locations contain a checksum error.

ACTION TAKEN (PCM WILL DEFAULT TO)
With a current DTC 112 set, the PCM will continue to seek a good location in the EEPROM. DTC 112 does not illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon).

DTC 112 WILL CLEAR WHEN
The fault no longer exists.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. If DTC 112 is current or history, the PCM cannot find another location to store the data. Cycle the ignition to give the PCM a chance to find a place to store the data. If the DTC resets, no place can be found so the PCM PROM must be replaced.