Pcm Removal/Installation: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

There are two types of PCM settings. If the incorrect PCM is installed, it could cause interference with engine control.
When replacing the PCM, verify the first four digits of the part number indicated on the PCM label before replacement, and replace the PCM with one having the same part number.

Fig 1: PCM Label
Courtesy of MAZDA MOTORS CORP.
If configuration and reprogramming is not performed when the PCM is replaced with a new one, the vehicle specification information and PCM software is not stored in the PCM and the system will not operate normally.
When performing configuration and reprogramming, it is necessary to read the vehicle specification information from the PCM before replacing it. Connect the M-MDS to the vehicle and perform vehicle identification before removing the PCM. The vehicle specification information is temporarily stored in the M-MDS.

NOTE:

The PCM prior to replacement stores the vehicle specification information.
A new PCM does not store any vehicle specification information.
If the vehicle specification information PCM prior to replacement cannot be read, perform the configuration using As-Built data.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the PCM cover. (See PCM Cover Installation Note .)

Fig 2: Removing PCM Cover
Courtesy of MAZDA MOTORS CORP.
Disconnect the PCM connector. (See PCM Connector Connection Note .)

Fig 3: Disconnect PCM Connector
Courtesy of MAZDA MOTORS CORP.
Remove the PCM assembly from the battery tray. (See PCM Assembly Installation Note .)

Fig 4: Removing PCM Assembly From Battery Tray
Courtesy of MAZDA MOTORS CORP.
Remove the PCM from the PCM bracket.

Fig 5: Removing PCM From PCM Bracket
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
When replacing the PCM on the vehicles, perform the following:
NOTE:
- If configuration cannot be performed by reading/writing of the vehicle specification information, perform the configuration using As-Built information after replacing the PCM. (See PCM CONFIGURATION (USING AS-BUILT DATA) .)
  1. Perform the PCM configuration. (See PCM CONFIGURATION (USING READ/WRITE FUNCTION) .)
  2. Perform the immobilizer system-related part programming. (See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING .)