DTC L

DTC indicator L: An Open in the Heater Core Temperature Sensor Circuit

NOTE: This code can cause the auto idle stop function not to work with the climate control on.

1. Disconnect the heater core temperature sensor 2P connector.




2. Measure the resistance between the No. 1 and No. 2 terminals of the heater core temperature sensor.

Is the resistance within the specifications shown on the graph?

YES - Go to step 3.

NO - Replace the heater core temperature sensor.

3. Disconnect climate control unit connector B (22P).




4. Check for continuity between the No. 4 terminal of climate control unit connector B (22P) and the No. 2 terminal of the heater core temperature sensor 2P connector.

Is there continuity?

YES - Go to step 5.

NO - Repair open in the wire between the climate control unit and the heater core temperature sensor.




5. Check for continuity between the No. 5 terminal of climate control unit connector B (22P) and the No. 1 terminal of the heater core temperature sensor 2P connector.

Is there continuity?

YES - Check for loose wires or poor connections at climate control unit connector B (22P) and at the heater core temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

NO - Repair open in the wire between the climate control unit and the heater core temperature sensor.