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DTC B3843Diagnostic Instructions
DTC DescriptorsDTC B3843 02: Air Quality Sensor Circuit Short to GroundDTC B3843 05: Air Quality Sensor Circuit High Voltage/Open DTC B3843 08: Air Quality Sensor Circuit Performance - Signal Invalid Diagnostic Fault Information
Circuit/System DescriptionThe HVAC control module detects exhaust gas by an air quality sensor. The air quality sensor is a 3-wire sensor with an ignition voltage circuit, a ground circuit and a signal circuit. The information is pulse width modulation (PWM) signal generated on the output pin. The HVAC control module evaluates the information of the air quality sensor and closes the recirculation flap while in the automatic mode as soon as the concentration of pollutants exceeds a preset value. Conditions for Running the DTC
Conditions for Setting the DTCB3843 02No PWM is detected and the signal is low. B3843 05No PWM is detected and the signal is high. B3843 08The Sensor sends a 5% PWM signal indicating an internal sensor short circuit or open circuit. Action Taken When the DTC SetsThe automatic recirculation mode is disabled. Conditions for Clearing the DTCThe condition for setting the DTC is no longer present. Reference InformationSchematic ReferenceConnector End View ReferenceDescription and OperationAutomatic HVAC Description and Operation Electrical Information ReferenceScan Tool ReferenceControl Module References for scan tool information Circuit/System VerificationVerify that DTC B3843 08 is not present.
Circuit/System Testing
Repair InstructionsPerform the Diagnostic Repair Verification after completing the diagnostic procedure.
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