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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1712 (HVAC Systems - Automatic) >> Diagnostic Information and Procedures >> DTC B0164 >> Test Description

Test Description

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The number below refers to the step numbers on the diagnostic table.

  1. 2:  The scan tool uses a default value. This will not give an accurate reading of the sensor value if an open or a short to ground is detected.
DTC B0164

Step Action Values Yes No
Schematic Reference  : HVAC Schematics 
1 Did you perform the HVAC Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - HVAC Systems - Automatic 
2 
  1. Turn OFF the ignition.
  2. Disconnect the inside air temperature sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the signal circuit of the inside air temperature sensor to a good ground.
Does the voltage measure near the specified value?		 5 V Go to Step 3  Go to Step 4 
3 Measure the voltage from the signal circuit to the low reference circuit of the inside air temperature sensor.
Does the voltage measure near the specified value?		 5 V Go to Step 6  Go to Step 5 
4 Test the signal circuit of the inside air temperature sensor for an open, for a high resistance, for a short to ground, or for a short to voltage. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
5 Test the low reference circuit of the inside air temperature sensor for a high resistance or for an open. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
6 Inspect for poor connections at the harness connector of the inside air temperature sensor. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and to CONNECTOR REPAIRS .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 7 
7 Test the resistance of the inside air temperature sensor. Refer to Sensor Resistance Table (Ambient and Inside Air Temp - ohms)  or Sensor Resistance Table (Upper, Lower and Aux Air Temp - ohms) .
Is the resistance measurement approximately equal to the Sensor Resistance Table value?		 - Go to Step 8  Go to Step 9 
8 Inspect for poor connections at the harness connector of the HVAC control module. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and to CONNECTOR REPAIRS .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
9 Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement .
Did you complete the replacement?		 - Go to Step 11  -
10
IMPORTANT: Perform the calibration procedure for the HVAC control module.
Replace the HVAC control module. Refer to HVAC Control Module Replacement .Did you complete the replacement?		 - Go to Step 11  -
11
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle according to the Conditions for Running in the DTC.
Does the DTC set again?		 - Go to Step 2  System OK
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