RAM 1500 Truck 2WD V8-5.7L VIN D (2003)
Thermostat: Testing and Inspection
DIAGNOSIS AND TESTING - THERMOSTAT
ON-BOARD DIAGNOSTICS
All gasoline powered models are equipped with On-Board Diagnostics for certain cooling system components. If the powertrain control module
(PCM) detects low engine coolant temperature, it will record a Diagnostic Trouble Code (DTC) in the PCM memory. Do not change a thermostat for
lack of heat as indicated by the instrument panel gauge or by poor heater performance unless a DTC is present.
The DTC can also be accessed through the DRBIII scan tool. Refer to the appropriate Powertrain Diagnostic Procedures information for diagnostic
information and operation of the DRBIII scan tool.
