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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> On-Board Diagnostic - Auto A/C >> DTC B1B71-11; B1B71-13; Evaporator Temperature Sensor Circuit Short To Ground Or Circuit Open >> Diagnostic procedure

Diagnostic procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

Step INSPECTION ACTION
1 INSPECT EVAPORATOR TEMPERATURE SENSOR CONNECTOR Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to Step 6.
2 INSPECT EVAPORATOR TEMPERATURE SENSOR Yes Go to the next step.
No Replace the evaporator temperature sensor.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .)
Go to Step 6.
3 VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to step 6.
4 INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Climate control unit and evaporator temperature sensor connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Climate control unit terminal 1E- evaporator temperature sensor terminal B
      • Climate control unit terminal 1Q- evaporator temperature sensor terminal A
  • Is there continuity?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and evaporator temperature sensor terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 6.
5 INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR SHORT TO GROUND
  • Climate control unit and evaporator temperature sensor connectors are disconnected.
  • Inspect for continuity between the following terminal (wiring harness-side) and body ground:
    • Climate control unit terminal 1E
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and evaporator temperature sensor terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

Go to the next step.
No Go to the next step.
6 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.
7 VERIFY THAT NO OTHER DTCs ARE PRESENT
  • Verify other DTCs displayed.
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] .)
No DTC troubleshooting completed.
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