Mazda RX-8 2004 - A;C Cut-Off Control Block Diagram; A;C Cut-Off Control Operation; Operation; A;C Cut-Off at Wide Throttle Valve Opening Angle

CONTROL SYSTEM
01–40–36
A/C CUT-OFF CONTROL BLOCK DIAGRAM
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• 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.
End Of Sie
A/C CUT-OFF CONTROL OPERATION
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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.
A/C Cut-off at Standing Start Acceleration
• When accelerated from a standing start, A/C cut-off is activated.
PCM
ECT SENSOR
TP SENSOR
A/C RELAY
APP SENSOR
VEHICLE SPEED SIGNAL
(CAN SIGNAL)
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ON
OFF
ON
OFF
LOWER
UPPER
A/C INHIBIT
A/C CUT TIME
A/C RELAY SIGNAL
5 s
THROTTLE VALVE
OPENING ANGLE
5 s
5 s
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