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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1003 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC B0159: Outside Air Temperature Sensor Circuit Range/Performance >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

Step Action Value(s) Yes No
Schematic Reference:  Engine Cooling Schematics  
Connector End View Reference:  Cooling System Connector End Views  
1 Did you perform the Engine Cooling Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Engine Cooling 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the HCM display DTC function on the scan tool.
Does the scan tool indicate that B0159 is a current DTC?		 - Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect the ambient air temperature sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the signal circuit of the ambient 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 ambient 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 ambient air temperature sensor for a high resistance. 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 ambient air temperature sensor for a high resistance. Refer to Circuit Testing andWiring 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 ambient air temperature sensor. 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 ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Replacement in HVAC Systems - Automatic.
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the HVAC control module. Refer to HVAC Control Module Replacement in HVAC Systems - Automatic.
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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