Terminals Of Ecu
- CHECK AIR CONDITIONING AMPLIFIER
HINT:
Check from the rear of the connector while it is connected to the A/C amplifier.
CONNECTOR TERMINAL REFERENCESymbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition B (K52-1) - Body ground L - Body ground Power source (Back-up) Always 10 to 14 V S5-1 (K52-7) - SG-1 (K52-19) P-B Power supply for room temperature sensor Power switch: OFF Below 1.0 V Power switch: ON (IG) 5 V BLW (K52-11) - GND (K52-20) G - W-B Blower motor control signal Power switch: ON (IG)
Blower switch: OFF → ONPulse generation (see WAVEFORM 1 ) PRE (K52-13) - SG-2 (K52-38) W-V Pressure sensor signal Start engine, operate A/C system Refrigerant pressure: Abnormal pressure (more than 3,030 kPa (31.0 kgf/cm2 , 440 psi)) 4.7 V or higher PRE (K52-13) - SG-2 (K52-38) W-V Pressure sensor signal Start engine, operate A/C system Refrigerant pressure: Abnormal pressure (less than 180 kPa (1.9 kgf/ cm2 , 27 psi)) Below 0.7 V PRE (K52-13) - SG-2 (K52-38) W-V Pressure sensor signal Start engine, operate A/C system Refrigerant pressure: Abnormal pressure (more than 3,030 kPa (31.0 kgf/cm2 ,440 psi) and more than 180 kPa (1.9 kgf/cm2 , 27 psi)) 0.7 to 4.7 V TSP (K52-14) - GND (K52-20) P - W-B Passenger side solar sensor signal Power switch: ON (IG)
Solar sensor subject to electric light0.8 to 4.3 V RH (K52-15) - SG-1 (K52-19) SB-B Humidity sensor signal Power switch ON (IG), vehicle interior temperature 25°C (77°F), vehicle interior humidity 40 to 60% 40%: 1.61 to 2.24 V
60%: 2.26 to 2.66 VTR (K52-16) - SG-1 (K52-19) BR-B Room temperature sensor signal Power switch ON (IG), vehicle interior temperature 25°C (77°F) 1.8 to 2.2 V SG-1 (K52-19) - Body ground B - Body ground Ground for room temperature sensor (built-in humidity sensor) Always Below 1.0 Ω GND (K52-20) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 Ω IG+ (K52-21) - Body ground W - Body ground Power source (IG) Power switch: OFF or ON (ACC) Below 1.0 V Power switch: ON (IG) 10 to 14 V S5-2 (K52-26) - SG-2 (K52-38) Y-V Power supply for pressure sensor Power switch: ON (IG)
A/C switch: OFFBelow 1.0 V Power switch: ON (IG)
A/C switch: ON5 V MPX+ (K52-30) - GND (K52-20) SB - W-B Multiplex communication system Engine idling after engine warmed up Pulse generation MPX- (K52-31) - GND (K52-20) Y - W-B Multiplex communication system Engine idling after engine warmed up Pulse generation DGS1 (K52-33) - SG-6 (K52-39) R-CR Exhaust gas sensor signal (NOx) After 30 seconds from power switch ON (IG) and sensor is exposed to exhaust gas 1.0 to 4.5 V DGS (K52-34) - SG-6 (K52-39) L-CR Exhaust gas sensor signal (HC, CO) After 30 seconds from power switch ON (IG) and sensor is exposed to exhaust gas 1.0 to 4.5 V TSD (K52-35) - GND (K52-20) LG - W-B Driver side solar sensor signal Power switch: ON (IG)
Solar sensor subject to electric light0.8 to 4.3 V SG-2 (K52-38) - Body ground V - Body ground Ground for pressure sensor Always Below 1.0 Ω SG-6 (K52-39) - Body ground CR - Body ground Ground for exhaust gas sensor Always Below 1.0 Ω BUSG (z1-2) - Body ground - Ground for BUS IC Always Below 1.0 Ω BUS (z1-3) - BUSG (z1-2) - BUS IC control signal Power switch: OFF → ON (IG) Pulse generation BBUS (z1-4) - BUSG (z1-2) - Power supply for BUS IC Power switch: OFF Below 1.0 V Power switch: ON (IG) 10 to 14 V SG-10 (z1-5) - BUSG (z1-2) - Ground for evaporator temperature sensor Always Below 1.0 Ω TE (z1-6) - SG-10 (z1-5) - Evaporator temperature sensor signal Power switch ON (IG), temperature near evaporator is 15°C (59°F) 1.4 to 1.8 V - Using an oscilloscope, check waveform 1.
Waveform 1 (Reference):
WAVEFORM REFERENCE 1Item Contents Symbols (Terminal No.) BLW (K52-11) - GND (K52-20) Tool Setting 1 V/DIV., 500 μsec./DIV. Vehicle Condition Power switch: ON (IG)
Blower switch: OFF → ONHINT:
When the blower level is increased, the duty ratio changes accordingly.
- Using an oscilloscope, check waveform 1.