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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> On-Board Diagnostic [HVAC System - Full-Auto Air Conditioner System] >> DTC B1B71:11, B1B71:13 [Full-Auto Air Conditioner] >> Diagnostic Procedure

Diagnostic Procedure

STEP INSPECTION ACTION
1 INSPECT EVAPORATOR TEMPERATURE SENSOR CONNECTOR 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the evaporator temperature sensor connector.
  • Inspect the connector and terminals (corrosion, damage, pin disconnection).
  • Are the connector and terminals normal?
 Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to the next step.
2 INSPECT EVAPORATOR TEMPERATURE SENSOR  Yes Go to the next step.
No Replace the evaporator temperature sensor.
(See A/C UNIT DISASSEMBLY/ASSEMBLY .)
Go to the next step.
3 INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT 
  • Disconnect the climate control unit connector and the evaporator temperature sensor connector.
  • Is there an open circuit in the wiring harness between the following terminals of the climate control unit and the evaporator temperature sensor?
    • 1V-A
    • 2G-B
 Yes Repair the wiring harness.
Go to the next step.
No Go to the next step.
4 INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND 
  • Is there a short circuit in the wiring harness between evaporator temperature sensor terminal B and body ground.
 Yes Repair the wiring harness.
Go to the next step.
No Connect the climate control unit connector, then go to the next step.
5 VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION 
  • Inspect the connector and terminals (corrosion, damage, pin disconnection).
  • Are the connector and terminals normal?
 Yes Go to the next step.
No Repair/replace the malfunctioning vehicle wiring harness, connector, or terminal.
After repair procedure, go to the next step.
6 INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT 
  • Connect the climate control unit connector.
  • Connect the negative battery cable.
  • Switch the ignition to ON.
  • Inspect the voltage at the following climate control unit terminal (wiring harness-side).
    • Terminal 2G (evaporator temperature sensor input signal)
  • Is the voltage normal? (Approx. 5 V  )
 Yes The system is normal at present.
Go to the next step.
No Go to the next step.
7 VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN  Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
8 VERIFY THAT NO OTHER DTCs ARE PRESENT 
  • Verify other DTCs displayed.
  • Are any other DTCs output?
 Yes Perform the corresponding DTC inspection.
No DTC troubleshooting completed.
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