Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 3216, Aftertreatment Intake NOx – MID 128 PPID 348 ECM SPN 3226, Aftertreatment Outlet NOx – MID 128 PPID 270/ PSID 90 MID 233 Fault code sent by MID 128 Engine control unit 56 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 2 • Data erratic, intermittent or incorrect • Inlet NOx sensor error (plausibility) • MIL illuminated • Engine out NOx high • Faulty NOx sensor FMI 3 • Voltage above normal, or shorted to high source • Short Circuit, NOx signal • MIL illuminated • Faulty wiring between NOx sensor and NOx sensor ECU • Faulty NOx sensor FMI 5 • Current below normal or open circuit • Open Circuit, NOx signal • MIL illuminated • Faulty wiring between NOx sensor and NOx sensor ECU • Faulty NOx sensor FMI 9 • Abnormal update rate • Missing signal from NOx sensor • MIL illuminated • Yellow electronic malfunction lamp illuminated • Loss of communication from NOx sensor ECU and Engine Control Module (ECM) FMI 11 • Root cause not known • NOx sensor measures near zero for long time with high load • MIL illuminated • Faulty NOx sensor FMI 12 • Bad intelligent device or component • NOx-sensor signal corrupt (incorrect value) • MIL illuminated • Faulty NOx sensor FMI 13 • Out of calibration • NOx-sensor activation (incorrect value) • MIL illuminated • Faulty NOx sensor FMI 14 • Special instructions • Missing signal from sensor due to battery voltage • MIL illuminated • Voltage to NOx sensor is too high or too low • Faulty harness to sensor Type of fault FMI Description:
Fault Condition: Possible Symptoms: Possible Cause FMI 2 • Data erratic, intermittent or incorrect • Inlet NOx sensor error (plausibility) • Mismatch between sensors • MIL illuminated • Engine out NOx high • Faulty NOx sensor • Aftertreatment Diesel Exhaust Fluid (DEF) quality FMI 3 • Voltage above normal or shorted to high source • Short Circuit, NOx signal • MIL illuminated • Faulty wiring between NOx sensor and NOx sensor ECU • Faulty NOx sensor FMI 5 • Current below normal or open circuit • Open Circuit, NOx signal • MIL illuminated • Faulty wiring between NOx sensor and NOx sensor ECU • Faulty NOx sensor