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DTC B0163, B0173, or B0178

Circuit Description

In-car sensor or Front PCAT Sensor allows the HVAC control module to monitor the temperature in the car.

DTC Descriptors

This diagnostic procedure supports the following DTC:

DTC B0163 Front PCAT Sensor Input Voltage

Conditions for Running the DTC

Ignition is ON.

Conditions for Setting the DTC

    • The HVAC control module determines that the value of the air temperature parameter is less than 0.27V or greater than 4.64V.
    • The HVAC control module detects a short to battery positive voltage in the In-car sensor or PCAT sensor.
    • The HVAC control module detects that the In-car sensor or PCAT sensor control circuit is open.

Action Taken When the DTC Sets

The In-car sensor or PCAT sensor value setting in 25 degrees.

Conditions for Clearing the DTC

    • The DTC will become history if the HVAC control module no longer detects a fault.
    • Ignition is ON or OFF.
    • The DTC can be cleared with a scan tool.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. Tests resistance of the In-car sensor or PCAT sensor.

  2. Tests the voltage of the In-car sensor or PCAT sensor from the HVAC control module.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

-

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the In-car sensor value in the Heating and Air Conditioning data list.

Does the scan tool indicate that the In-car parameter is within the specified range?

0.27-4.64V

Go to Step 8

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the In-car sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the In-car sensor data parameter.

Does the scan tool indicate that the In-car data parameter is greater than the specified value?

4.64V

Go to Step 4

Go to Step 5

4
  1. Turn OFF the ignition.
  2. Connect a fused jumper wire between the signal circuit of the In-car sensor and the low reference circuit of the In-car sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the In-car sensor parameter.

Does the scan tool indicate that the Duct Actual data parameter is less than the specified value?

0.27V

Go to Step 8

Go to Step 6

5

Test the signal circuit of the In-car sensor for a short to ground.

Did you find and correct the condition?

-

Go to Step 12

Go to Step 9

6

Test the signal circuit of the In-car sensor for a short to voltage, a high resistance, or an open.

Did you find and correct the condition?

-

Go to Step 12

Go to Step 7

7

Test the low reference circuit of the In-car sensor for a high resistance or an open.

Did you find and correct the condition?

-

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the harness connector of the In-car sensor.

Did you find and correct the condition?

-

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the harness connector of the HVAC control module.

Did you find and correct the condition?

-

Go to Step 12

Go to Step 11

10

Replace the In-car sensor.

Did you complete the replacement?

-

Go to Step 12

-

11

Replace the HVAC control module.

Did you complete the replacement?

-

Go to Step 12

-

12
  1. Use the scan tool to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

-

Go to Step 2

System OK

   


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