For 1990-2009 cars only
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 Descriptors
DTC B0481 00: Overheat Detected, Software LevelDTC B0482 00: Overheat Detected, Hardware Level
DTC B0483 00: Overheat Possible
Circuit/System Description
The fuel operated heater uses a coolant heater overheat sensor to protect the unit for over temperature conditions. The fuel operated heater also uses overheat detection software.
Conditions for Running the DTC
Engine is running.
Conditions for Setting the DTC
The fuel operated heater has recognized an over temperature condition.
Action Taken When the DTC Sets
The fuel operated coolant heater is disabled.
Conditions for Clearing the DTC
| • | A current DTC will clear when the conditions for setting the DTC are no longer present. |
| • | A history DTC will clear after 40 malfunction-free ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Air Temperature Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, verify DTC B0460 or B0462 is not set.
- If all circuits test normal, replace the coolant heater.
| ⇒ | If either DTC is set, refer to DTC B0460 or B0462 . |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
