Do not driveMinutes
J1939 code SPN 1073. Below — how the fault is worded at the factory by Dongfeng, Ford Trucks, Renault Trucks and SITRAK, and what the second half of the code (FMI) means in the standard.
DongfengFord TrucksRenault TrucksSITRAK
| FMI 3 | Short circuit to power or open circuit at the engine brake control output. Scan tool code: P1204. Effect: Torque limited, the engine may shut down. |
| FMI 4 | Short circuit to ground at the engine brake control output. Scan tool code: P1205. Effect: Torque limited, the engine may shut down. |
Ford Trucks/Ecotorq writes fault numbers in its own format: the code in the table below is a Ford code (hexadecimal, zero-padded), not a J1939 SPN. It matches the standard only where the signal itself is standard, and usually matches the title of this page by digit alone.
| FMI 3 | Connector or wiring harness defective (short circuit between AIM1 and VPSx), proportional solenoid valve (magnetic coil) defective, IT-ECU output efective |
| FMI 5 | Connector or wiring harness defective (interrupt AIM1/VPS1), proportional solenoid valve(magnetic coil) defective, IT-ECU output defective |
| FMI 6 | Connector or wiring harness defective (short circuit between AIM1 and VMGx/vehicle ground) |
| FMI 14 | Single error: Proportional solenoid valve(magnetic coil) defective. In combination with “Short circuit or inductance error of activation solenoid valve”: Connector or wiring harness defective (short circuit between AIM1 and AIM 2). |
| FMI 4 | Jacob engine brake, stage 2 — short to ground. Repair: Check the JACOB 2 solenoid valve and the wiring (A 8, A 27). Check the solenoid valve and the wiring (J 1/20, J 1/43). |
| FMI 5 | Jacob engine brake, stage 2 — open circuit or short to battery positive. Repair: Check the JACOB 2 solenoid valve and the wiring (A 8, A 27). Check the solenoid valve and the wiring (J 1/20, J 1/43). |
| FMI 0 | Engine brake valve #2 fault: high-side short to battery and low-side short to ground. Scan tool code: P1204. Effect: Torque limited, the engine may shut down. |
| FMI 1 | High-side short to battery on engine brake valve #2. Scan tool code: P1204. Effect: Torque limited, the engine may shut down. |
| FMI 2 | High-side short to battery on engine brake valve #2. Scan tool code: P1204. Effect: Torque limited, the engine may shut down. |
| FMI 3 | High-side short to ground on engine brake valve #2. Scan tool code: P1204. Effect: Torque limited, the engine may shut down. |
| FMI 4 | Open load on the low side of engine brake valve #2. Scan tool code: P1205. Effect: Torque limited, the engine may shut down. |
| FMI 5 | Low-side short to battery on engine brake valve #2. Scan tool code: P1205. Effect: Torque limited, the engine may shut down. |
| FMI 6 | Low-side short to ground on engine brake valve #2. Scan tool code: P1205. Effect: Torque limited, the engine may shut down. |
| FMI 7 | Low-side short to ground on engine brake valve #2. Scan tool code: P1205. Effect: Torque limited, the engine may shut down. |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
Part of the brake circuit or ABS/EBS is out of service. The pedal may still feel normal — until the first emergency stop or descent.
Next comes longer stopping distance, a skid on a slick surface, failure on a long downgrade. This is the case where "I will take it slow" does not work.
Let the air system build to working pressure and listen for leaks. Don’t drive with faulty brakes.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.