#
A/C CUT-OFF CONTROL

id014000161100

## Outline

• The function of the A/C cut-off control is essentially carried over from that of the previous Mazda 121 121DEMIO (DW) models except for the following:

  - Operation condition

## Operation

### Operation condition

  • If any of the following conditions have been met, the PCM turns the power off to the A/C relay:

Operation condition | Time period for A/C relay power stop | Purpose
--- | --- | ---
At engine start | Approx. 4 s | Improve startability
Drive from standing start | Approx. 3 s | Improve standing start ability
During acceleration (throttle valve opening angle 50% or more) | Approx. 5 s | Improve acceleration ability
Engine coolant temperature approx. 113°C {235°F} | Switches on and off every 10 s until engine coolant temperature is less than approx. 107°C {224°F}. | Improve engine reliability
Engine coolant temperature approx. 117°C {243°F} | Until the engine coolant temperature drops to less than approx. 110°C {230°F} | Improve engine reliability
High engine speed (engine speed 5,710 rpm or more) | Until engine speed drops to 5,210 rpm or less | Improve reliability of A/C compressor
During P/S operation (idling) | Until P/S stops | Improve idling stability
PCM internal temperature higher than specified value | - | PCM protection
Evaporator temperature less than 4°C {39°F}*1 | Until evaporator temperature rises to 4°C {39°F} or more | To prevent shut off of airflow through the evaporator passage by frozen water droplets

  *1 :
Only vehicles with manual air conditioning