CONTROL SYSTEM
01–40–33
01–40
A/C CUT-OFF CONTROL OUTLINE [LF]
E5U014000000N43
• Through energization and non-energization to the A/C relay (magnetic clutch) according to engine operation
conditions, acceleration performance and engine reliability have been improved.
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A/C CUT-OFF CONTROL BLOCK DIAGRAM [LF]
E5U014000000N44
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A/C CUT-OFF CONTROL OPERATION [LF]
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• The PCM stops energization to the A/C relay when any of the following conditions are met:
A/C cut-off control operation conditions
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TR SWITCH (AT)
ECT SENSOR
CKP SENSOR
NEUTRAL SWITCH (MT)
CPP SWITCH (MT)
A/C RELAY
PCM
TP SENSOR NO.1, NO.2
APP SENSOR NO.1, NO.2
A/C AMPLIFER
REFRIGERANT PRESSURE
SWITCH (HIGH, LOW)
E5U140ZT5009
Operation condition A/C relay non-energization period Purpose
At engine start Approx. 4 s Improved startability
At drive-away
Approx. 3 s
Improved drive-away
performance
During acceleration (throttle valve opening angle 50%
or more)
Approx. 5 s
Improved acceleration
performance
When the engine coolant temperature is 113 °C {235
°F}
Repeatedly turns on and off every 10 s
until the engine coolant temperature is
less than approx. 110 °C {230 °F}
Improved engine reliability
When the engine coolant temperature is 118 °C {245
°F} or more
Until the engine coolant temperature
decreases to less than approx. 114 °C
{237 °F}
Improved engine reliability
At high engine speed (engine speed 6,600 rpm or
more)
Approx. 1 s
Improved engine speed
stability
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