B0158
DTC B0158
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0158 02
- Ambient Air Temperature Sensor Circuit Short to Ground
DTC B0158 05
- Ambient Air Temperature Sensor Circuit High Voltage/Open
Diagnostic Fault Information
Circuit/System Description
The instrument cluster monitors the ambient air temperature sensor with a low reference circuit and 5 V signal circuit. The instrument cluster monitors the voltage drop across the sensor, which is proportional to temperature. When the ambient air temperatures are cold, the resistance of the sensor is high and the voltage signals are high. When the ambient air temperatures are hot, the resistance of the sensors is low and the voltage signals are low. The instrument cluster converts the voltage value to a temperature value of Celsius or Fahrenheit that will be displayed by the driver information center.
Conditions for Running the DTC
The system voltage is between 9-16 V
Conditions for Setting the DTC
B0158 02
The instrument cluster detects the sensor signal circuit is more than 88°C (190°F).
B0158 05
The instrument cluster detects the sensor signal circuit is less than -40°C (-40°F).
Action Taken When the DTC Sets
The instrument cluster uses a default air temperature value for further calculations. The driver information center displays ---°C ( ---°F).
Conditions for Clearing the DTC
The DTC will become history if the instrument cluster no longer detects a malfunction.
Reference Information
Schematic Reference
Instrument Cluster Schematics (Instrument Cluster Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Instrument Cluster Description and Operation (Instrument Cluster)
Driver Information Center (DIC) Description and Operation (Driver Information Center (DIC))
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Ambient Air Temperature parameter. The reading should be between -40°C (-40°F) to +88°C (+190°F) and change with air temperature changes.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B9 Ambient Air Temperature Sensor.
2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the P16 Instrument Cluster.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the P16 Instrument Cluster.
3. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Ambient Air Temperature parameter displays greater than 54 °C (130 °F).
• If less than the specified range, test the low reference circuit a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 Instrument Cluster.
4. If all circuits test normal, test or replace the B9 Ambient Air Temperature Sensor.
Component Testing
Static Test
1. Test the B9 Ambient Air Temperature Sensor by varying the sensor temperature while monitoring the sensor resistance.
2. Compare the readings with the Ambient Air Temperature Sensor Resistance (Specifications).
• If not within the specified range, replace the B9 Ambient Air Temperature Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Ambient Air Temperature Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for module replacement, programming and setup