B1512

DTC B1512-H/L: Air Flow Control Actuator (Position Sensor) and/or Its Circuit Malfunction

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Check DTC.

DTC Troubleshooting

NOTE:

When DTC B1502, B1503, B1511 and B1530 are indicated together, it is possible that "BLK/RED" wire circuit open.

1. Position sensor power supply circuit check

Disconnect air flow control actuator connector with ignition switch turned OFF.
Check for proper connection to air flow control actuator at "RED/WHT", "WHT/BLU" and "BLK/RED" wire terminals.
If OK, measure voltage between "RED/WHT" wire terminal of air flow control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 4 - 6 V?
YES -
Go to Step 6.
NO -
Go to Step 2.

2. Position sensor power supply circuit check

Disconnect temperature control actuator connector with ignition switch turned OFF.
Measure voltage between "RED/WHT" wire terminal of air flow control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 4 - 6 V?
YES -
Temperature control actuator faulty.
NO -
Go to Step 3.

3. Position sensor power supply circuit check

Disconnect air intake control actuator connector with ignition switch turned OFF.
Measure voltage between "RED/WHT" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 4 - 6 V?
YES -
Air intake control actuator faulty.
NO -
Go to Step 4.

4. Position sensor power supply circuit check

Disconnect connector from HVAC control module with ignition switch turned OFF.
Check for proper connection to HVAC control module connector at "G52-25", "G52-26" and "G52-24" terminals.
If OK, measure resistance between "RED/WHT" wire terminal of air flow control actuator connector and "G52-25" terminal of HVAC control module connector.

Is resistance below 5 ohms?
YES -
Go to Step 5.
NO -
"RED/WHT" wire open or high resistance circuit.

5. Position sensor power supply circuit check

Measure resistance between "RED/WHT" wire terminal of air flow control actuator connector and vehicle body ground.

Is resistance infinity?
YES -
Go to Step 6.
NO -
"RED/WHT" wire shorted to ground circuit.

6. Position sensor power supply circuit check

Measure voltage between "RED/WHT" wire terminal of air flow control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 0 V?
YES -
Go to Step 7.
NO -
"RED/WHT" wire shorted to other circuit.

7. Position sensor signal circuit check

Connect HVAC control module connector with ignition switch turned OFF.
Measure voltage between "WHT/BLU" wire terminal of air flow control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 4 - 6 V?
YES -
Go to Step 11.
NO -
Go to Step 8.

8. Position sensor signal circuit check

Disconnect connector from HVAC control module with ignition switch turned OFF.
Measure resistance between "WHT/BLU" wire terminal of air flow control actuator connector and "G52-24" terminal of HVAC control module connector.

Is resistance below 5 ohms?
YES -
Go to Step 9.
NO -
"WHT/BLU" wire open or high resistance circuit.

9. Position sensor signal circuit check

Measure resistance between "WHT/BLU " wire terminal of air flow control actuator connector and vehicle body ground.

Is resistance infinity?
YES -
Go to Step 10.
NO -
"WHT/BLU" wire shorted to ground circuit.

10. Position sensor signal circuit check

Measure voltage between "WHT/BLU" wire terminal of air flow control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 0 V?
YES -
Go to Step 11.
NO -
"WHT/BLU" wire shorted to other circuit.

11. Position sensor ground circuit check

Connect HVAC control module connector with ignition switch turned OFF.
Measure resistance between "BLK/RED" wire terminal of air flow control actuator connector and vehicle body ground.

Is resistance below 5 ohms?
YES -
Go to Step 13.
NO -
Go to Step 12.

12. Position sensor ground circuit check

Measure resistance between "G52-26 " terminal of HVAC control module connector and vehicle body ground.

Is resistance below 5 ohms?
YES -
"BLK/RED" wire open or high resistance circuit.
NO -
HVAC control module faulty.

13. Air flow control actuator check

Check air flow control actuator referring to Inspection Air Flow Control Actuator Inspection.

Is it in good condition?
YES -
HVAC control module faulty.
NO -
Air flow control actuator faulty.