Home

Mazdamanuals.com

DTC B1086:71 [DASH-ELECTRICAL SUPPLY UNIT]

DTC B1086:71 [DASH-ELECTRICAL SUPPLY UNIT]


 id0702k8002800


Outline

System malfunction location

Airflow mode actuator motor lock

Detection condition
•  The dash-electrical supply unit detects that the airflow mode actuator remains operating clockwise or counterclockwise and does not stop for 15 s or more.
Fail-safe
•  Airflow mode actuator drive signal is stopped right when the malfunction is determined.
Possible cause
•  Airflow mode actuator malfunction
•  A/C unit malfunction
―  Airflow mode main link malfunction
―  Airflow mode door malfunction
•  Dash-electrical supply unit malfunction
System wiring diagram
Not applicable
Connector diagram
Not applicable


Diagnostic Procedure

Step

Inspection

Results

Action

1
VERIFY OTHER DTCs RELATED TO AIRFLOW MODE ACTUATOR INTERNAL POTENTIOMETER CIRCUIT
•  Perform the DTC inspection for the dash-electrical supply unit.
•  Are other DTCs related to the airflow mode actuator internal potentiometer circuit displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
No
Go to the next step.
2
INSPECT AIRFLOW MODE ACTUATOR FOR MALFUNCTION
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
3
INSPECT AIRFLOW MODE MAIN LINK OPERATION
•  Operate the airflow mode main link manually.
•  Does the airflow mode main link operate smoothly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification 1
VERIFY THAT VEHICLE IS REPAIRED
•  Install/connect the part removed/disconnected during the troubleshooting procedure.
•  Clear the DTC recorded in the memory.
•  Switch the ignition ON (engine off or on) and wait for 15 s or more.
•  Perform the DTC inspection for the dash-electrical supply unit.
•  Is the same Pending DTC present?
Yes
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
•  If the malfunction recurs, replace the dash-electrical supply unit, then go to the next step.
No
Go to the next step.
Repair completion verification 2
VERIFY IF OTHER DTCs DISPLAYED
•  Perform the DTC inspection.
•  Are any DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.