B3933

DTC B3933

CIRCUIT DESCRIPTION
The HVAC control module monitors the evaporator temperature via the evaporator temperature sensor. When the air is cold, the sensor resistance and signal voltage are high. When the air is warm, the sensor resistance and signal voltage are low.

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
- DTC B3933 Evaporator Temperature Sensor Circuit
- DTC P1531 Air Conditioning (A/C) Evaporator Temperature Sensor Circuit




This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The HVAC control module detects the evaporator temperature sensor signal circuit is less than 0.09 volt (5 counts) or greater than 4.90 volts (250 counts).

ACTION TAKEN WHEN THE DTC SETS
- The driver information center (DIC) will display SERVICE A/C SYSTEM.
- The A/C OFF segment will illuminate on the HVAC control module.
- The A/C compressor will be disabled.

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the HVAC control module no longer detects a failure.
- The history DTC will clear after 50 fault-free ignition cycles.
- The DTC can be cleared with a scan tool.

TEST DESCRIPTION

Step 1 - Step 7:

Step 8 - Step 13:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for the proper operation of the circuit in the high voltage range.
4. This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens upon performing this test, the signal circuit has a short to voltage.