SPN 704/FMI 3
High Exhaust System Temperature Lamp – indicates a short to power/open circuit on pin 7 of the CPC #4 connector. For wiring schematic information refer to OEM literature.
Note: The CPC digital outputs have the same SPN as some MCM faults. DDDL 7.0 makes the distinction between the MCM and CPC when diagnosing a fault.