System Diagnostics

Fault detection is through stored Diagnostic Trouble Codes (DTCs)

• DTCs are displayed by the DRBIII(R).
• All MTC DTCs are stored in the BCM. Diagnostics for these DTCs can be found in the Heating & A/C category of this article.
• DTCs pertaining to A/C compressor control circuits and the radiator fan control circuits are stored in the PCM Diagnostics for these DTCs can be found in the Powertrain Diagnostic Procedures article. Diagnostics for symptoms pertaining to A/C compressor operation can also be found in the Powertrain Diagnostic Procedures article.