SPN 1110 FMI 13: Meaning and Fix
SPN 1110 FMI 13 indicates the Engine Protection System (EPS) has commanded a shutdown due to an out-of-calibration condition on the shutdown status signal. This fault typically appears after a forced DPF regeneration or when a sensor (e.g., coolant level, oil pressure) sends erratic voltage. Technicians often see this after replacing the ECM without recalibrating the shutdown circuit. The ECM expects a binary 0 or 1, but receives an invalid state (10b or 11b), triggering the fault.
Common Symptoms
- Engine Stall: Engine shuts down unexpectedly during operation or idle, often without warning.
- No Restart: Engine cranks but fails to start after shutdown, requiring diagnostic reset.
- Warning Lamps: Red stop lamp and amber warning lamp illuminate simultaneously on the dash.
- Derate Mode: Engine power is severely limited before shutdown, reducing speed below 1200 RPM.
Probable Causes
- ECM Calibration: ECM calibration lost after software update or battery disconnect, causing invalid state.
- Wiring Fault: Short to battery or ground on J1939 shutdown circuit, corrupting signal.
- Sensor Drift: Coolant level or oil pressure sensor out of range, forcing EPS to invalid state.
- Corrupted J1939: CAN bus noise from faulty termination resistor or damaged harness.
Advanced Technical Analysis
The ECM monitors the shutdown status signal on a dedicated J1939 PGN (PGN 65262). When the signal state is 10b (Error) or 11b (Not Available) for more than 500 ms, the internal debouncing timer expires and sets FMI 13. This indicates the microcontroller cannot interpret the signal as a valid binary 0 or 1. Real-world examples include a technician accidentally grounding the shutdown pin while testing.
Electrically, the shutdown circuit is pulled high to 5V via an internal resistor. An out-of-calibration fault occurs when the voltage deviates outside the 0.5–4.5V window for more than 200 ms. This can be caused by a corroded pin in the Deutsch connector (often at the ECM J1 connector) or a failed pull-up resistor inside the ECM. MAN factory manuals specify measuring voltage at pin 37 of the ECM.
The EPS safety fallback mechanism engages a two-stage derate: first, torque is reduced to 40% for 30 seconds; if the signal remains invalid, the ECM commands a full engine shutdown via the fuel shutoff solenoid. This is documented in Bosch EDC17 C55 ECU logic. After shutdown, the ECM locks out restart until the fault is cleared with a diagnostic tool, preventing runaway conditions.
Long-term prevention requires verifying that all EPS sensors (coolant level, oil pressure, exhaust temp) are within factory calibration. Deutz workshop manuals recommend performing a ‘Sensor Learn’ procedure after any ECM replacement. A common real-world scenario: after a forced DPF regeneration, the shutdown solenoid wiring chafes against the exhaust bracket, causing intermittent ground shorts that generate this fault.
Step-by-Step Troubleshooting Guide
- Read Fault Codes: Use a J1939 scan tool to confirm SPN 1110 FMI 13 and check for related sensor faults.
- Inspect Wiring: Visually check J1939 harness at ECM connector for corrosion, chafing, or loose pins.
- Measure Voltage: Measure voltage at ECM shutdown input pin; should be 0V (shutdown) or 5V (run) only.
- Recalibrate ECM: Perform ECM calibration routine per manufacturer procedure using factory diagnostic software.