Diagnostic Routine U

Diagnostic Routine U

Diagnostic Overview

B10B3:00, B10B4:00, B10B5:00, B10B6:00

Refer to Wiring Diagram Set 55 for schematic and connector information Electrical Diagrams.

DTC Fault Trigger Conditions






Pinpoint Test

1. CHECK THE AIR DISCHARGE TEMPERATURE SENSOR OUTPUT VOLTAGE

1. Ignition ON.

2. Turn the HVAC (Heating, Ventilation, and Air Conditioning) system on.

3. Disconnect: the appropriate air discharge temperature sensor:

- left panel air discharge temperature sensor C2438
- left floor air discharge temperature sensor C2436
- right panel air discharge temperature sensor C2439
- right floor air discharge temperature sensor C2437

4. Measure:





Is the voltage between 4.7 and 5.1 volts?






2. CHECK THE AIR DISCHARGE TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect: HVAC (Heating, Ventilation, and Air Conditioning) Module C228B.

3. Measure:





Is the resistance less than 3 ohms?






3. CHECK THE AIR DISCHARGE TEMPERATURE SENSOR SIGNAL RETURN CIRCUIT FOR AN OPEN

1. Measure:





Is the resistance less than 3 ohms?






4. CHECK THE AIR DISCHARGE TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

1. Measure:





Is the resistance greater than 10,000 ohms?






5. CHECK THE AIR DISCHARGE TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

1. Ignition ON.

2. Measure:





Is any voltage present?






6. CHECK AIR DISCHARGE TEMPERATURE SENSOR SIGNAL CIRCUIT AND THE SIGNAL RETURN FOR A SHORT TO TOGETHER

1. Ignition OFF.

2. Measure:





Is the resistance greater than 10,000 ohms?






7. CHECK FOR CORRECT HVAC (Heating, Ventilation, and Air Conditioning) MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect all the HVAC (Heating, Ventilation, and Air Conditioning) module connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the HVAC (Heating, Ventilation, and Air Conditioning) module connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?