Central Processing Unit (MPV) Test

The Central Processing Unit (CPU) acts as an electrical load sensor. Remove CPU from behind left side of instrument panel. Check voltage at terminals of CPU connector. See Fig 1 or Fig 2 . If voltages are incorrect, check appropriate circuit. If circuits are okay and voltages are still incorrect, replace CPU.

Fig 1: 2.6L CPU Unit Voltage Chart

Courtesy of MAZDA MOTORS CORP.

Fig 2: 3.0L CPU Unit Voltage Chart*

Courtesy of MAZDA MOTORS CORP.