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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. End Of Sie A/C CUT-OFF CONTROL BLOCK DIAGRAM [LF] E5U014000000N44 End Of Sie A/C CUT-OFF CONTROL OPERATION [LF] E5U014000000N45 • The PCM stops energization to the A/C relay when any of the following conditions are met: A/C cut-off control operation conditions End Of Sie 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 During acceleration (throttle valve opening angle 50% Approx. 5 s Improved acceleration 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 Approx. 1 s Improved engine speed |