Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This test resets HVAC control processor and checks for current air temperature DTC.
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Ambient air temperature must be above 38 °F in order for this A/C Compressor test to be run.
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The specified values are from the A/C System Performance Test.
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Schematics DEFINITION: Temperature can not be adjusted or cooling insufficient during A/C operation. | ||||||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |||||
Does the scan tool display DTC B1340 or B1341? | -- | Go to Step 3 | ||||||
3 | Place the blower motor switch in each speed position. Does the blower motor operate in each speed position? | -- | Go to Step 4 | Go to Blower Motor Inoperative | ||||
4 | Does the blower motor operate at the desired speeds? | -- | Go to Step 5 | Go to Blower Motor Malfunction | ||||
5 |
Does the recirculation door move from the recirculation position to the outside air position? | -- | Go to Step 6 | |||||
6 | When the A/C is ON, does the customer concern occur? | -- | Go to Step 7 | Go to Step 9 | ||||
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Important: The ambient air temperature must be above 3° C (38° F).
Does the A/C compressor operate? | -- | Go to Step 8 | ||||||
Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test in Heating, Ventilation, and Air Conditioning. Are low and high side pressures within specifications? | -- | Go to Step 9 | Go to Leak Testing in Heating, Ventilation and Air Conditioning | |||||
9 |
Do the counts change when actuators are commanded? | -- | Go to Step 10 | Go to Step 16 | ||||
10 | Inspect the inside air temperature sensor for proper installation. Refer to Inside Air Temperature Sensor Replacement . Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 11 | ||||
11 | Inspect for airflow through the inside air temperature sensor by placing a 5cm (2in) square piece of paper over the sensor air inlet. Does the paper stay in place? | -- | Go to Step 12 | Go to Step 18 | ||||
12 |
Does the scan tool indicate sensor temperatures near the thermometer temperatures within the specified range? | -3 to 3°C (-5 to 5°F) | Go to Step 13 | Go to Step 15 | ||||
13 |
Does the scan tool indicate that the solar sensor parameter is greater than the specified value? | 230 Counts | Go to Step 14 | Go to Step 21 | ||||
14 |
Do the counts change? | -- | System OK | Go to Step 21 | ||||
15 | Test the inside air temperature sensor resistance. Refer to the Sensor Resistance Table. Does the resistance measure near the Sensor Resistance Table? | -- | Go to Step 22 | Go to Step 20 | ||||
16 | Test the suspect actuator door control circuit for a short to voltage, short to ground, open or high resistance. Refer to Circuit Testing and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 17 | ||||
17 | Test the suspect actuator ignition 3 voltage circuit for a short to ground, open or high resistance. Refer to Circuit Testing and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 27 | Go to Step 19 | ||||
18 | Inspect the aspirator tube and HVAC module for the following conditions:
Did you find and correct the condition? | -- | Go to Step 27 | -- | ||||
19 | Inspect for poor connections at the harness connector of the suspect 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 27 | Go to Step 25 | ||||
20 | Inspect for poor connections at the harness connector of the inside 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 27 | Go to Step 23 | ||||
21 | Inspect for poor connections at the harness connector of the sunload 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 27 | Go to Step 24 | ||||
22 | Inspect for poor connections at the harness connector of the HVAC control processor. 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 27 | Go to Step 26 | ||||
23 | Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- | ||||
24 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- | ||||
25 |
Important: Perform the recalibration procedure for the air temperature actuator. Replace the suspect air temperature actuator. Refer to Air Temperature Actuator Replacement - Right Side or Air Temperature Actuator Replacement - Left Side . Did you complete the replacement? | -- | Go to Step 27 | -- | ||||
26 |
Important: Perform the recalibration procedure for the HVAC control processor. Replace the HVAC Control processor. Refer to HVAC Control Processor Replacement . Did you complete the replacement? | -- | Go to Step 27 | -- | ||||
27 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 | ||||
