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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1418 (HVAC Systems - Automatic) >> Diagnostic Information and Procedures >> DTC B0159 Or B0164: Air Temperature Sensor >> Test Description

Test Description

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

  1. 2:  Verifies that the condition that set the DTC is present.
DTC B0159 or B0164

Step Action Value(s) Yes No
Schematic Reference:  HVAC Schematics  
Connector End View Reference:  HVAC Connector End Views  
1 Did you perform the HVAC Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - HVAC Systems - Automatic 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the HVAC control module display DTC function on the scan tool.
Does the scan tool indicate that B0159 or B0164 is a current DTC?		 - Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3
  1. Turn OFF the ignition.
  2. Disconnect the appropriate air temperature sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the signal circuit of the appropriate air temperature sensor to a good ground.
Does the voltage measure near the specified value?		 5 V Go to Step 4  Go to Step 5 
4 Measure the voltage from the signal circuit to the low reference circuit of the appropriate air temperature sensor.
Does the voltage measure near the specified value?		 5 V Go to Step 7  Go to Step 6 
5 Test the signal circuit of the appropriate air temperature sensor for an open, high resistance, short to ground, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
6 Test the low reference circuit of the appropriate air temperature sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
7 Inspect for poor connections at the harness connector of the appropriate air temperature sensor assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
8 Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
9 Replace the air temperature sensor assembly. Refer to the appropriate replacement procedure:
Did you complete the replacement?		 - Go to Step 11  -
10 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 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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