B1511

DTC B1511: Temperature Control Actuator (Position Sensor) and/or Its Circuit Malfunction

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Troubleshooting

NOTE:

- When DTC B1502, B1503, B1504 and B1512 are indicated together, it is possible that sensor ground circuit is open.
- When DTC B1512 is indicated together, it is possible that position sensor power supply circuit is open.



1.
Was "Air Conditioning System Check" performed?
YES
Go to Step 2.
NO
Go to Air Conditioning System Check:Auto A/C.

2. Wire harness check

Turn ignition switch to OFF position.
Disconnect connectors from temperature control actuator and HVAC control module.
Check for proper connection to position sensor power supply, signal and ground circuit terminals of temperature control actuator and HVAC control module connectors.
If OK, check that position sensor of temperature control actuator circuit is as follows.
- Wiring harness resistance of each position sensor power supply, signal and ground circuit is less than 3 ohms
- Insulation resistance of each position sensor power supply, signal and ground circuit is infinity between temperature control actuator connector and vehicle body ground
- Circuit voltage of each position sensor power supply, signal and ground circuit is 0 - 1 V with ignition switch turned ON

Are they in good condition?
YES
Go to Step 3.
NO
Position sensor power supply, signal circuit and/or ground circuit are open, short or high resistance.

3. Position sensor of temperature control actuator power supply voltage check

Connect connector to HVAC control module.
Turn ignition switch to ON position.
Measure voltage between.
- Position sensor power supply terminal and position sensor ground terminal of temperature control actuator connector
- Position sensor signal terminal and position sensor ground terminal of temperature control actuator connector

Is voltage 4.5 - 5.5 V?
YES
Go to Step 4.
NO
Go to Step 5.

4. Temperature control actuator check

Check position sensor of temperature control actuator for performance referring to Circuit Inspection Temperature Control Actuator and Its Circuit Inspection:Auto A/C.

Is it in good condition?
YES
Substitute a known-good HVAC control module and recheck.
NO
Replace temperature control actuator.

5. Position sensor of temperature control actuator power supply voltage check

Turn ignition switch to OFF position.
Disconnect connector from air flow control actuator.
Turn ignition switch to ON position.
Measure voltage between.
- Position sensor power supply terminal and position sensor ground terminal of temperature control actuator connector
- Position sensor signal terminal and position sensor ground terminal of temperature control actuator connector

Is voltage 4.5 - 5.5 V?
YES
Check air flow control actuator and its circuit.
NO
Substitute a known-good HVAC control module and recheck.