Exact capacity, torque, pressure and service interval must be verified by engine sub-code and OEM documentation.
Engine-family application research
This section connects a verified manufacturer relation to the model catalog; listed model families do not mean confirmed part/application fitment. Verify full code, build period, market and software identity.
Mercedes-Benz identifies OM 654 as the four-cylinder diesel member of a new engine family and describes it as its first all-aluminium four-cylinder diesel.[S1]
The OM 654 manufacturer description lists steel pistons, stepped combustion bowls, NANOSLIDE cylinder coating and fourth-generation common-rail injection.[S1]
The exhaust aftertreatment elements are packaged directly on the engine; Mercedes-Benz also describes multiway EGR combining cooled high- and low-pressure EGR.[S1]
Verified application matches
The matches below are published only within the stated market, model-year and evidence scope. Fitment is not extrapolated to uncited variants.
Engine: OM 654
Evidence scope: manufacturer engine-family description; calibration varies by application
System architecture and component relationships
Diagnostic architecture separates low/high-pressure fuel, turbo/air path, high+low-pressure EGR and the engine-mounted DPF/SCR/NOx/EGT aftertreatment chain.
For EGR faults, correlate air mass, boost, HP/LP EGR commands and exhaust pressure/temperature behavior.
Because aftertreatment is close-coupled, sensor temperature ordering and dosing behavior should be time-correlated with the actual thermal event.
DTC / SPN-FMI / symptom discrimination map
For low power/rail faults, capture low-side supply, rail target/actual and injector corrections at the same load.
For EGR/boost faults, branch MAF, boost, EGR command and charge-air/exhaust leak or restriction tests separately.
For NOx/SCR faults, correlate EGT sequence, upstream/downstream NOx and dosing command rather than condemning the catalyst from one sensor code.
Measurement and diagnostic strategy
Capture cold-engine sensor rationality, then observe EGT/NOx/EGR behavior through a controlled warm-up.
Do not invent exact pressure thresholds without the applicable service procedure; use target-versus-actual deviation and independent supply verification.
After repair, recreate comparable temperature/load and verify derate, fault state and PID normalization together.
Exact pinouts, torque values, pressure thresholds or service limits are published only when explicitly verified by the applicable OEM service source.
What should be verified when deepening this record?
Within an engine family, sub-code, displacement, turbo, injection, emissions level and software generation can vary. Connect compression/leakage, lubrication, air path, fuel pressure, synchronization and aftertreatment data in one diagnostic chain.
The same model name can carry different engines, transmissions, emissions packages and ECU software across years and markets. Verify VIN/chassis, engine code, production period and controller identity together before selecting parts or procedures. If an exact value is not supported, AutoAtlas does not fill the gap by guessing.
Mercedes-Benz OM654: variant, live-data and failure-chain file engine code, family, application, common-problem, live-data, air/fuel, emissions and measurement intents are connected around the same engine identity.
Do not treat a family name as exact application; verify vehicle/model, code, market and controller identity before moving to maintenance or repair decisions.
