TECHNICAL KNOWLEDGE CENTER

Deep Technical Diagnostic Atlas

A measurement-led atlas for electrical, network, engine, emissions, driveline, hydraulic, heavy-duty, EV and ADAS systems before parts replacement.

DIESELCommon-Rail Fuel Pressure

rail pressure command/actual, low-side supply, injector leak-off, regulator control

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AFTERTREATMENTDPF Differential Pressure

differential pressure, soot estimate, ash loading, regeneration conditions

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AFTERTREATMENTSCR / DEF Dosing

DEF quality, dosing command, NOx upstream/downstream, catalyst temperature

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AIREGR Flow Control

commanded EGR, measured airflow, manifold pressure, valve position

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AIRTurbo Boost Control

boost target/actual, actuator command, charge-air leaks, exhaust drive energy

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AIRVGT Actuator

vane command/feedback, soot binding, vacuum/electric drive, boost response

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AIRMAF Diagnostics

air mass, plausibility, intake leaks, EGR interaction

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AIRMAP / Boost Sensor

key-on plausibility, atmospheric reference, boost response, wiring

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EMISSIONSLambda / O2 Control

sensor response, heater circuit, fuel trims, catalyst context

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AFTERTREATMENTNOx Sensor System

sensor supply, temperature readiness, upstream/downstream plausibility, SCR conversion

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AFTERTREATMENTEGT Sensor Chain

temperature gradient, cold-soak plausibility, wiring, regeneration context

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ENGINEElectronic Throttle Actuator

command/position correlation, motor current, deposits, supply/ground

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FUELInjector Balance

correction values, cylinder contribution, leak-off, rail stability

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FUELHigh-Pressure Pump

supply pressure, metering command, rail rise rate, contamination

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FUELLow-Pressure Fuel Supply

pump command, voltage drop, pressure/flow, restriction

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ENGINEMisfire Analysis

misfire counters, ignition/injection, compression, air leak

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MECHANICALCompression and Leak-down

relative compression, mechanical timing, leakage path, cylinder comparison

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TIMINGCam / Crank Correlation

sync pattern, mechanical timing, VVT command, sensor integrity

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TIMINGVariable Valve Timing

oil condition, target/actual angle, solenoid command, phaser response

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LUBRICATIONOil Pressure Control

mechanical pressure, commanded stage, oil temperature, pickup/filter condition

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THERMALCooling / Overheat Diagnostics

coolant temperature, thermostat behavior, fan command, flow/pressure

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ELECTRICAL12/24 V Charging System

resting voltage, charging command, voltage drop, current demand

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ELECTRICALParasitic Draw / Sleep

sleep transition, module wakeups, current trend, network activity

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ELECTRICALStarter and Cranking

cranking voltage, current, rpm, voltage drop

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ELECTRICALGround Voltage Drop

loaded ground drop, shared grounds, connector heat, reference offsets

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NETWORKCAN Bus Diagnostics

termination resistance, bias levels, waveform, module isolation

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NETWORKLIN Bus Diagnostics

master wakeup, supply, line waveform, slave isolation

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NETWORKUDS Diagnostic Sessions

DTC status, freeze-frame, session/security context, routine results

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NETWORKJ1939 Network Diagnostics

SPN/FMI, source address, bus integrity, active/inactive faults

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TRANSMISSIONAutomatic Transmission Diagnostics

fluid temperature, ratio error, clutch slip, pressure commands

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TRANSMISSIONDCT / Mechatronics

clutch adaptation, actuator position, hydraulic pressure, temperature

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TRANSMISSIONCVT Diagnostics

ratio command/actual, pressure, temperature, pulley/belt behavior

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TRANSMISSIONHeavy-Duty Powershift

clutch pressure, speed sensors, calibration, oil temperature

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TRANSMISSIONTorque Converter

lockup command/slip, temperature, engine/transmission speed

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DRIVELINETransfer Case

range command, actuator position, speed correlation, oil condition

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DRIVELINEDifferential Lock

lock command, position feedback, wheel speed context, pneumatic/electric actuation

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CHASSISABS Wheel Speed Sensors

wheel speed correlation, air gap/tone ring, wiring, bearing play

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CHASSISESC Yaw / Steering Angle

steering angle, yaw/lateral acceleration, calibration, wheel speed

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CHASSISAir Suspension

ride height, reservoir pressure, compressor duty, valve block leakage

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CHASSISTPMS System

sensor identity, pressure/temperature, relearn state, RF reception

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HYDRAULICHydraulic Pump Diagnostics

standby/load pressure, case drain, oil temperature, cavitation

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HYDRAULICHydraulic Valve / Spool

command current, spool response, pressure drop, contamination

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HYDRAULICLoad-Sensing Hydraulics

LS signal, pump margin, compensator response, leakage

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HEAVYPTO System

engagement command, interlocks, speed feedback, hydraulic/pneumatic actuation

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AGRITractor Three-Point Hitch

position/draft feedback, valve command, calibration, hydraulic pressure

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AGRITractor CVT / IVT

requested/actual ratio, hydrostatic branch, clutch states, calibration

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HEAVYAftertreatment Derate

active SPN/FMI, inducement stage, DEF/SCR/DPF state, engine protection

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HEAVYAir Brake System

reservoir pressure, compressor, dryer, modulator command, leaks

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HEAVYRetarder / Intarder

commanded braking, temperature, CAN request, speed/gear context

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BUSBus Door Pneumatics

air pressure, interlocks, position sensors, valve command

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OFFHIGHWAYConstruction Machine Regeneration

soot load, exhaust temperature, inhibit state, engine load

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OFFHIGHWAYExcavator Swing System

pilot pressure, command, motor case drain, brake release

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OFFHIGHWAYLoader Hydraulic Power

pump pressure, implement command, lift/tilt cylinder leakage, temperature

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ADASADAS Camera Calibration

mounting geometry, calibration status, DTCs, target/road procedure prerequisites

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ADASRadar Calibration

mounting angle, bracket damage, calibration state, alignment prerequisites

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EVEV High-Voltage Isolation

isolation status, contactor state, moisture/connector context, safe service procedure

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EVEV Battery / BMS

cell voltage spread, temperature, SOC/SOH context, contactor/precharge state

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EVInverter / Traction Motor

DC bus, phase current, resolver position, thermal limits

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EVOn-Board Charger

AC input, pilot state, DC output, thermal/network status

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EVDC Fast Charging

handshake state, pack limits, connector temperature, charger/vehicle fault ownership

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HYBRIDHybrid Energy Flow

engine/motor torque request, SOC, clutch states, regen limits

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MARINEMarine Engine Cooling

raw-water flow, impeller, heat exchanger, exhaust temperature

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MARINEMarine Fuel System

water contamination, lift pressure, filters, rail/carburetion context

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STATIONARYGenerator Governor / Frequency

engine speed, load step response, actuator command, frequency stability

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Sources & freshness

Sources & freshness

Exact technical values, prices and failure rates are not invented without verified vehicle/manufacturer evidence.

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