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 DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B3933 Evaporator Temperature Sensor Circuit

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 air conditioning (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 9:

Step 10 - Step 12:

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/count range.
4. This step tests for the proper operation of the circuit in the low voltage/count range. If the fuse in the jumper opens upon performing this test, the signal circuit has a short to voltage.