Table of Contents 752 Air Conditioning and Climate Control Control Panels .................................................................................. 135 Temperature Variables ..................................................................... 136 Thermistors ....................................................................................... 137 Evaporator Temperature Sensor ...................................................... 137 Room Temperature Sensor Auto A/C ............................................... 138 Ambient Temperature Sensor ..........................................................
139 Vehicle Speed Sensor ...................................................................... 139 Solar Sensor ..................................................................................... 140 Duct Sensor ...................................................................................... 141 Humidity Sensor ............................................................................... 142 Servo-motors .................................................................................... 143 Air Inlet Mode Control ................................................................... 143 Air Mix Control ..............................................................................
143 Outlet Mode Control ..................................................................... 143 Cool Air Bypass Servo-motor ....................................................... 143 Variable Resistor-type .................................................................. 144 Servo-motor Control Circuit .............................................................. 145 BUS Communication ........................................................................ 145 Typical Connector ............................................................................. 146 BUS Connector .................................................................................
146 Pulse-Type Servo-motors ................................................................. 147 BUS Connectors ............................................................................... 148 Matching Connectors to Servo-motors ............................................. 149 Section 7: Diagnostics Section 7 Topics ............................................................................... 151 Systematic Diagnosis ....................................................................... 152 6-Step Diagnostic Process ........................................................... 152 Common Problems ...........................................................................
154 Compressor ...................................................................................... 154 Test at A/C ECU Terminal ................................................................. 154 Sight, Sound & Touch ....................................................................... 155 Performance Test ............................................................................. 155 Check Mode Procedure .................................................................... 156 Actuator Check ................................................................................. 158 Customizable Settings ......................................................................
159 Changing Customizable Settings ..................................................... 160 Diagnostic Trouble Codes ................................................................ 161 Data List ........................................................................................... 162 Thermistor Testing ............................................................................ 163 Techstream & Data List .................................................................... 163 Testing Resistance ........................................................................... 164 Solar Sensor Test .............................................................................
165 Servo-motor Test .............................................................................. 166 Active Test ........................................................................................ 167 Technical Training v