| Source document | Controller | Fault pairs |
|---|---|---|
| Troubleshooting manual, engines over 56 kW (2024) | Engine ECU | 327 |
| System | Fault pairs |
|---|---|
| Aftertreatment | 142 |
| Electrical | 44 |
| Fuel | 42 |
| Engine | 39 |
| Air Intake | 21 |
| Network | 19 |
| Instrument | 13 |
| Cooling | 4 |
| Lubrication | 3 |
| Fault family | Fault pairs |
|---|---|
| DEF Supply Module Pump and Pressure Circuit | 32 |
| Aftertreatment DCU Internal Processor/Memory Fault | 16 |
| DEF Supply/Return/Suction Line Heater Circuit | 14 |
| DEF/Urea Tank Temperature Sensor Circuit | 12 |
| Injector Cylinder Circuit | 12 |
| Accelerator Pedal Position Sensor | 10 |
| EGR Valve Actuator Circuit and Calibration | 10 |
| J1939 Message Reception Timeout -- Engine-Side Device or Command | 10 |
| Aftertreatment DCU Power Supply Circuit | 9 |
| DEF Dosing/Metering Unit (Injector) Circuit | 9 |
| FMI | Meaning | Fault pairs |
|---|---|---|
| 0 | Reading in-range but far too high | 35 |
| 1 | Reading in-range but far too low | 15 |
| 2 | Signal unstable, intermittent or implausible | 15 |
| 3 | Circuit voltage high / short to supply | 52 |
| 4 | Circuit voltage low / short to ground | 43 |
| 5 | Current too low; open circuit | 25 |
| 6 | Current too high; short to ground | 23 |
| 7 | Mechanical part not reacting or misadjusted | 20 |
| 8 | Wrong frequency, pulse width or period | 3 |
| 9 | Message not arriving at expected rate | 22 |
| 10 | Value changing implausibly fast or slow | 18 |
| 11 | Fault detected, cause undetermined | 1 |
| 12 | Smart device or component defective | 27 |
| 13 | Calibration data outside limits | 10 |
| 15 | Slightly above normal range | 5 |
| 16 | Moderately above normal range | 4 |
| 17 | Slightly below normal range | 4 |
| 18 | Moderately below normal range | 2 |
| 19 | Network-received value flagged as error | 1 |
| 31 | Fault present; no further detail | 2 |
176 distinct SPNs appear in these pairs. 154 of the 327 pairs use SPNs that Yanmar assigns itself (516,096 and above), named from its own documents; the rest use standard SPNs whose meaning is the same on every make.
Rows for this OEM from the free sample. The dataset adds the ordered procedures for every pair, with cost and labour estimates where known and a part name where one is mapped.
| SPN | FMI | OEM code | Description | Fault family |
|---|---|---|---|---|
| 3516 | 4 | P206C | DEF quality sensor internal circuit shorted | DEF/Urea Quality (Concentration) Sensor Circuit |
| 523557 | 3 | P1510 | DEF hose heater (back-flow/pressure/suction), H- or L-side shorted to battery | DEF Supply/Return/Suction Line Heater Circuit |
| 523596 | 3 | P2216 | SCR downstream NOx sensor internal circuit shorted | NOx Sensor Downstream of SCR Circuit |
| 91 | 4 | P0122 | Accelerator pedal position sensor circuit reads low (shorted to ground) | Accelerator Pedal Position Sensor |
| 630 | 2 | P1601 | ECU EEPROM memory fault | ECU Internal Fault (Memory/Software) |
| 2971 | 12 | P0403 | EGR valve actuator motor coil circuit open (disconnected) | EGR Valve Actuator Circuit and Calibration |
| 518280 | 6 | P1735 | Buzzer output circuit shorted to battery supply | Dashboard Lamp / Indicator Output Circuit |