B1032-Evaporator Temperature Sensor Circuit High: Notes
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For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS information.
Theory of Operation
The Evaporator Temperature Sensor is a variable resistor that changes in conjunction with temperature, or otherwise known as a thermistor. The Evaporator Temperature Sensor is located in the HVAC housing downstream of the A/C evaporator. The A/C Heater Control module monitors the evaporator temperature by monitoring the voltage change of the Evaporator Temperature Sensor Signal circuit. If the monitored voltage drops below or rises above a predetermined voltage, a DTC will set.
- >>When Monitored:<< With the ignition on.
- >>Set Condition:<< The Evaporator Temperature Sensor voltage input to the A/C Heater Control is greater than 4.95 volts for a continuous period of five seconds. If the A/C Heater Control detects a valid voltage, the Diagnostic Trouble Code (DTC) will change from Active to Stored and will stay in the controllers memory for 100 ignition cycles.
| Possible Causes |
|---|
| (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN |
| (C121) SENSOR GROUND CIRCUIT OPEN |
| EVAPORATOR TEMPERATURE SENSOR |
| A/C HEATER CONTROL |
Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to HVAC .