System Diagnostics (MTC)

Fault detection is through Diagnostic Trouble Codes (DTCs)

• DTCs are displayed by the DRBIII®.
• DTCs pertaining to the Evaporator Temperature Sensor are stored in the BCM. Diagnostics for these DTCs can be found in the Heating & A/C category of this article.
• Diagnostics for symptoms pertaining to A/C compressor operation can be found in the Heating & A/C category of this article and in the Power-train Diagnostic Procedures article.
• DTCs pertaining to A/C compressor control circuits are stored in the PCM/ECM. Diagnostics for these DTCs can be found in the POWERTRAIN DIAGNOSTIC PROCEDURES article.
• Refer to the Service procedures for additional MTC system diagnosis and testing information.