Aftertreatment expert review (sensors, monitors and indicators)

Where: Diagnostics › More tests › Service functions › Channel “v2 procedures (beta)” › “One-click full diagnosis” › box “Add Aftertreatment expert review”

Important: Only people with a current forensic authorization (expert, SERMI operator or authority agent) and the Hub administrator see it. It is read only: it writes, erases and resets nothing, forces no regeneration, activates or simulates no sensor and reads no PIN, keys or secrets.

1. Choose car or van, truck or agricultural, the unit and the vehicle details, and tick the review box.
2. Press the start button. Towards the end the test asks you to start the engine and leave it idling for about two minutes while it measures each sensor.
3. Read the traffic light and the indicators: each one says what was read, the criterion with its threshold and the source.
4. Open the sensor sheet to see everything each sensor measured: NOx before and after the treatment, lambda sensors, temperatures, pressures and state of the particulate filter, AdBlue, EGR, monitors and counters.
5. If needed, save the reads in an open expert case file, which already has its legal basis.

What it looks for:

• A NOx sensor that gives the same value in every sample with the engine running.
• NOx after the SCR almost equal to before while AdBlue is being dosed.
• AdBlue with a concentration out of range (or flagged as wrong by the control unit) and no consumption.
• Particulate filter pressure almost zero with a lot of soot or a lot of flow, and exhaust temperatures that do not change.
• Lambda sensors that do not move.
• Inducement without warnings (or not declared) with confirmed faults of the reagent, dosing, NOx sensors or EGR.
• Monitors reported as “not supported” when the vehicle itself gives data of that system.
• Fault memory cleared recently or more than once.
• NOx-tracking and Euro 7 OBM counters that do not fit the kilometres.
• The module's programming fingerprint, versions or secure-transmission entity identifier (F19F) different from an earlier reading.

The aftertreatment control module (acronym ACM) is identified and read with the “Exhaust aftertreatment control (ACM)” procedures of the forensic reading: full identification, programming trace, faults with their status and frozen data. It is only identified and read.

Important: An indicator does not by itself prove tampering or an offence: there are legitimate causes (dirty or faulty sensors, repairs, replacements, updates). The decision always rests with the expert or the person inspecting and the competent authority.

The thresholds are platform review criteria, not regulations or manufacturer values; the report quotes them. Euro 7 assigns no read identifiers to the OBM: its values are typed by hand in the optional section if they were read with the manufacturer's tool.

This is forensic mode and it only reads. The aftertreatment repair functions (forced regeneration, soot or ash reset after replacing the filter, adaptation after the replacement and resetting the inducement after the repair) belong to diagnosis mode and are in Service functions, with their usual permissions. More in “Forensic mode and diagnosis mode”.

Open the platform See it in the help centre