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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 - Manual A/C >> DTC B13AB-12; B13AB-13; Air Mix Actuator (Potentiometer) Circuit Short To Power Supply Or Open >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

STEP INSPECTION ACTION
1 INSPECT AIR MIX ACTUATOR CONNECTOR Yes Go to the next step.
No Repair/replace the connector or terminal.
After repair procedure, go to Step 6.
2 INSPECT AIR MIX ACTUATOR Yes Go to the next step.
No Replace the air mix actuator.
(See AIR MIX ACTUATOR REMOVAL/INSTALLATION [MANUAL 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 AIR MIX ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT
  • Climate control unit and air mix actuator connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Climate control unit terminal L-air mix actuator terminal E
    • Climate control unit terminal I-air mix actuator terminal F
      • Climate control unit terminal R- air mix actuator terminal G
  • 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 air mix actuator 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 AIR MIX ACTUATOR (POTENTIOMETER) SHORT TO POWER SUPPLY
  • Climate control unit and air mix actuator connectors are disconnected.
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the following terminals (wiring harness-side):
    • Climate control unit terminal L
    • Climate control unit terminal I
      • Climate control unit terminal R
  • Is the voltage 0 V?
 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 air mix actuator 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 power supply.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

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

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 (MANUAL AIR CONDITIONER)] .)
No DTC troubleshooting completed.
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