Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC 8: Intake Sensor ErrorDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Intake Sensor Signal | 8 | 8 | 8 | 8 |
Ground | -- | 8 | -- | 8 |
Circuit/System Description
The HVAC intake sensor monitors the temperature of the fresh air in the air inlet by way of a sensor circuit that sends a signal to the Heating Ventilation and Air Conditioning (HVAC) module.
Conditions for Running the DTC
| • | The engine must be running. |
| • | The HVAC control unit must be ON. |
Conditions for Setting the DTC
This DTC will set if the output of the in-car sensor indicates a short circuit or an open in the sensor or the associated wiring harness, or a malfunction in the HVAC controller.
Action Taken When the DTC Sets
| • | The HVAC system stays in a default mode until the fault is cleared. |
| • | The diagnostic code remains on the display. |
Conditions for Clearing the DTC
The diagnostic code automatically clears after the fault has been rectified.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
Circuit/System Verification
Engine running, observe the HVAC control display. The HVAC control unit should be able to be adjusted to the desired temperature.
Circuit/System Testing
- Ignition OFF, disconnect the intake sensor harness connector at the HVAC controller.
- Ignition OFF, test for less than 1.0 ohm of resistance between the low reference circuit terminal 2 and ground.
- Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 1 and low reference circuit terminal 2.
- If all circuits test normal, test or replace the intake air sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC controller. |
| ⇒ | 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 HVAC controller. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC controller. |
Component Testing
- Ignition OFF, disconnect the harness connector at the intake sensor.
- Test for 7080-8080 ohms of resistance between the signal terminal 1 and the low reference circuit terminal 2.
| ⇒ | If not within the specified range, replace the intake air sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
