A/C Cut-Off Control Block Diagram; A/C Cut-Off Control Operation; Operation; A/C Cut-Off At Wide Throttle Valve Opening Angle - Mazda RX-8 2004 Service Highlights

A/C CUT-OFF CONTROL BLOCK DIAGRAM

• The PCM determines the engine conditions based on signals from the various input parts and sends an on/off
control signal to the A/C relay.
ECT SENSOR
TP SENSOR
APP SENSOR
VEHICLE SPEED SIGNAL
(CAN SIGNAL)
End Of Sie

A/C CUT-OFF CONTROL OPERATION

Operation

• The A/C cut-off control includes the following: A/C cut-off at wide throttle valve opening angle and A/C cut-off at
standing start acceleration.

A/C Cut-off at Wide Throttle Valve Opening Angle

Operation condition
• When the throttle valve opening angle exceeds upper, A/C cut-off is activated for approx. 5 s to improve
acceleration performance.
• When the throttle valve opening angle is lower or less, A/C cut-off ends.
• When A/C cut-off at wide throttle valve opening angle ends within approx. 5 s and the throttle valve opening
angle exceeds upper again, A/C cut-off is inhibited to prevent deterioration of the A/C function.
THROTTLE VALVE
OPENING ANGLE
UPPER
LOWER
ON
A/C RELAY SIGNAL
OFF
ON
A/C CUT TIME
OFF

A/C Cut-off at Standing Start Acceleration

• When accelerated from a standing start, A/C cut-off is activated.
01–40–36
CONTROL SYSTEM
PCM
5 s
A/C RELAY
5 s
5 s
A/C INHIBIT
CHU014000140S43
CHU0140S032
CHU014000140S44
CHU0140S033