Two channels tell the whole story
Whenever power is being cut, the ECU reports it in two channels. Engine Limiting Method says how it's cutting: a value of 0 means nothing is being cut, 1 means fuel is being removed, and 2 means spark is being removed. Engine Limiting Function says which feature asked for the cut. Put both in your logs and on a dash page and a mystery misfire usually solves itself in seconds.
Engine Limiting Function values
| Value | Function | What it usually means |
|---|---|---|
| 0 | None | No limiting active. This is what you want to see |
| 1 | Immobiliser | The immobilizer is preventing the engine from running |
| 2 | Map version error | The loaded map does not match what the firmware expects |
| 3 | Electronic throttle error | A drive-by-wire fault was detected |
| 4 | Electronic throttle redundancy error | The paired DBW signals disagree with each other |
| 5 | Decel cut | Fuel is cut on overrun, which is normal |
| 6 | Over boost cut | Boost went past the overboost limit |
| 7 | Ignition switch | The ignition switch input is off |
| 8 | Anti-flood | An anti-flood strategy is holding back fuel |
| 9 | Limp mode | A fault has put the ECU into limp mode |
| 10 | Rotational idle | Cut used by the rotational idle feature |
| 11 | Launch control | The launch limiter is holding RPM |
| 12 | Torque reduction | A torque reduction request is active |
| 13 | Flat shift | Power is cut for a flat-foot shift |
| 14 | Aux limiter | The auxiliary RPM limiter is active |
| 15 | Main limiter | The main rev limiter is active |
| 16 | Speed limiter | A road speed limit is active |
| 17 | Supervisor error | An internal safety check in the ECU has stepped in |
| 18 | Turbo Timer | The turbo timer is running the engine after key-off |
| 19 | Engine Protection | An engine protection rule has triggered |
| 20 | Flood Clear | Flood clear mode is cutting fuel while cranking |
| 21 | Diagnostic trouble code | A DTC set to limit the engine is active |
| 22 | LPG | Limiting related to LPG operation |
| 23 | Kill Switch | The kill switch input is active |
| 24 | Traction Control | Traction control is removing power |
| 25 | Rolling Anti-lag | Rolling anti-lag is cutting to build boost |
| 26 | Torque Management DS RPM | Torque management based on driveshaft RPM |
| 27 | Trans-Brake Control | Limiting while the trans-brake is engaged |
| 28 | Injection System Error | A fault was detected in the injection system |
| 29 | Main Setup (F4) Page Error | A problem with the main setup configuration |
| 30 | Injection System Disable | Injection has been deliberately disabled |
| 31 | Torque Model | The torque model is reducing output |
| 32 | Start/Stop Button | The start/stop button has shut the engine down |
| 33 | Throttle Blip | Limiting related to a throttle blip on downshift |
| 34 | IMU Calibration | An IMU calibration is in progress |
Our tip
If a car "breaks up" and the log shows a value you didn't expect, fix the cause rather than raising the limit. Protection features like the main limiter and engine protection are doing their job. See don't blow your engine for how we set those up, or send us the log.
