Chapter 40 · Troubleshooting, Verification & Reference

Glossary & Acronyms

The master alphabetical dictionary of Bosch Motronic symbols and acronyms.

Calibration symbols

DWKRZ_0..3 LAMSONI_W CWDLSAHK LAMSBG_W B_BREMS B_KUPPL B_STEND CWNOMIL DSLGRAD KFFDLGO KFLDHBN KFLDIMX KFZWTVS PVDKS_W +113 more

ECUs covered

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Size

127 symbols · 0 diagrams · ~1,840 words

The master alphabetical dictionary of Bosch Motronic symbols and acronyms.

To facilitate rapid reverse engineering, cross-calibration porting, and binary disassembling, this section compiles over 100 canonical Bosch Motronic ME7.5 engineering symbols, German technical acronyms, physical RAM variables, calculation flags, and hardware identifiers.

BOSCH MOTRONIC ENGINEERING NAMING PREFIX CONVENTIONS

Prefix	German Derivation	Engineering Architectural Meaning
B_	Bedingung	Single-bit boolean logical condition flag (0 or 1)
CD	Codewort Diagnose	Single-byte diagnostic feature enable/disable switch
CW	Codewort	Bitmask configuration word (multi-bit feature switches)
DW	Delta Winkel	Angular offset value (e.g. ignition retard degrees)
F	Faktor	Correction multiplier or scalar weighting factor
K	Konstante	Calibration scalar constant
KF	Kennfeld	3D surface map (Lookup table with X and Y axes)
KL	Kennlinie	2D characteristic curve (Lookup table with single X axis)
N	Drehzahl	Rotational velocity / engine speed parameter (RPM)
P	Druck	Fluid pressure parameter (hPa or bar)
R	Relative Füllung	Relative cylinder air filling percentage (Load %)
T	Zeit / Temperatur	Time constant (seconds/ms) or temperature (°C)
TV	Totzeit Vorsteuerung	Injector dead time / latency compensation offset
V	Geschwindigkeit	Vehicle road speed parameter (km/h)
W	Winkel	Geometric angle parameter (Throttle ° or Crankshaft °KW)
ZW	Zündwinkel	Ignition timing angle relative to TDC (°BTDC / °KW)

Master Alphabetical Symbol Directory (Over 100 Defined Symbols)#

ARMIN (Antiruckeln Minimal): Anti-jerk closed-loop damping coordinator that suppresses driveline shudder via ignition timing retard.
ASR (Antriebsschlupfregelung): Traction control system; commands fast torque reduction via CAN when driven wheel slip is detected.
ATR (Abgastemperaturmodell): Physical mathematical model that calculates real-time exhaust gas temperature (tabg_w) without a thermocouple.
B_brems (Bedingung Bremsschalter): Boolean bit flag indicating that the brake pedal is depressed (F47/F).
B_kuppl (Bedingung Kupplungsschalter): Boolean bit flag indicating that the clutch pedal is depressed (F36).
B_lr (Bedingung Lambdaregelung): Boolean status flag indicating active closed-loop stoichiometric lambda control.
B_stend (Bedingung Startende): Engine running flag asserted after crank flare-up; unlocks full throttle authority.
BTS (Bauteileschutz): Component protection thermal subsystem; enriches fueling to cool exhaust valves and turbine.
CDATR (Codewort Diagnose Abgastemperaturregelung): Diagnostic codeword for the physical thermocouple EGT sensor.
CDHSH (Codewort Diagnose Heizung Sonde Hinten): Diagnostic codeword for the secondary rear oxygen sensor heater.
CDKAT (Codewort Diagnose Katalysator): Master diagnostic codeword for catalytic converter conversion efficiency.
CDLASH (Codewort Diagnose Lambda-Alterung Sonde Hinten): Diagnostic codeword for secondary oxygen sensor aging response.
CDLDP (Codewort Diagnose Leckdiagnosepumpe): Master diagnostic codeword for the fuel tank Leak Detection Pump (V144).
CDLMM (Codewort Diagnose Luftmassenmesser): Diagnostic codeword for the Mass Air Flow sensor (G70).
CDSLS (Codewort Diagnose Sekundärluftsystem): Master diagnostic codeword for the Secondary Air Injection system.
CDTES (Codewort Diagnose Tankentlüftungssystem): Diagnostic codeword for the EVAP canister purge flow monitor.
CDTHER (Codewort Diagnose Kennfeldthermostat): Diagnostic codeword for the electrically heated map thermostat (F265).
CWBLS (Codewort Bremslichtschalter): Configuration codeword governing brake-over-throttle power cut logic.
CWDLSAHK (Codewort Diagnose Lambdasonde Alterung nach Kat): Master codeword enabling rear O2 sensor surveillance.
CWNOMIL (Codewort Keine MIL-Anforderung): Master codeword enabling global suppression of the Check Engine Light.
CWSAWE (Codewort Schubabschneidung Weiterführung): Configuration codeword for auxiliary overrun fuel cut-off delay.
DFPM (Diagnosefehlerpfadmanager): Centralized 4-level diagnostic architecture managing fault classification and MIL triggers.
DK (Drosselklappe): The mechanical butterfly plate inside the electronic throttle body.
dkv_w (Drosselklappenwinkel): Physical angular position of the throttle plate (0.0\text{°} to 82.0\text{°}).
DLBTS (Delta Bauteileschutz): Transient delta step fuel enrichment applied when entering component protection.
DMLLR (Dynamische Momentenbegrenzung Leerlaufregler): Dynamic airflow reserve for idle speed stability.
DPOVE (Diagnose Plausibilität Offset Voltage Einlass): Lower diagnostic plausibility voltage limit for the MAP sensor.
DPUVE (Diagnose Plausibilität Upper Voltage Einlass): Upper diagnostic plausibility voltage limit for the MAP sensor.
DSLGRAD (Drucksensor Linearer Gradient): MAP sensor conversion slope in \text{hPa}/\text{V}.
DSLOFS (Drucksensor Linearer Offset): MAP sensor pressure intercept offset at 0.0\text{V} in \text{hPa}.
DVE (Drosselklappe Elektronisch): Complete closed-loop electronic throttle control system (Drive-by-Wire / E-Gas).
DWKREC (Delta Winkel Klopfen Recovery): Ignition advance recovery ramp rate following a knock retard event.
dwkrz_0..3 (Delta Winkel Klopfen Zylinder 1..4): Real-time individual cylinder knock retard angles (°KW).
DWKSTE (Delta Winkel Klopfen Stufe): Immediate ignition retard step applied upon detecting knock (typically -3.0\text{°}).
ELAUF (Eingriffsuntergrenze Antiruckeln): Lower engine speed threshold for anti-jerk regulator activation.
ESKONF (Endstufenkonfiguration): 7-byte hardware output driver mask controlling electrical pin monitoring.
FAW (Faktor Abklingung Warmstart): After-start fuel decay multiplier during engine flare-up.
FDLD (Faktor Differential Ladedruck): Derivative damping coefficient for turbocharger boost control.
FKKVS (Korrekturfaktor Kraftstoffversorgung): Fuel injector individual cylinder pulsation correction matrix.
FKST (Faktor Kraftstoff Start): Auxiliary coolant temperature multiplier applied during cold cranking.
fr_w (Faktor Regelung): Short-term lambda controller trim value (\lambda = 1.00 \pm \text{trim}).
fra_w (Faktor Regelung Adaptiv): Multiplicative long-term fuel trim (LTFT under partial-throttle load).
FRLFN (Füllung Relative Normiert): 3D volumetric efficiency matrix used for Speed Density / Alpha-N calculation.
FST (Faktor Start): Primary cranking fuel enrichment curve plotted against coolant temperature.
FTBR (Faktor Temperatur Brennraum): Intake air density correction factor inversely proportional to absolute temp (K).
G28 (Geber für Motordrehzahl): The primary 60-2 variable reluctance crankshaft speed and position sensor.
G31 (Ladedrucksensor): Manifold absolute pressure (MAP) sensor located on the intercooler or charge pipe.
G40 (Hallgeber): Camshaft position Hall sensor mounted to the front of the intake camshaft.
G42 (Ansauglufttemperatursensor): Intake air temperature (IAT) thermistor.
G61 (Klopf-Sensor 1): Piezoelectric knock sensor monitoring cylinders 1 and 2.
G62 (Kühlmitteltemperaturgeber): Dual-circuit engine coolant temperature (ECT) sensor.
G66 (Klopf-Sensor 2): Piezoelectric knock sensor monitoring cylinders 3 and 4.
G70 (Luftmassenmesser): Hot-film anemometer mass air flow (MAF) sensor.
G79 / G185 (Geber für Gaspedalstellung): Dual redundant potentiometers inside the accelerator pedal assembly.
G186 (Drosselklappenantrieb): Bidirectional DC electric servo motor inside the electronic throttle body.
G187 / G188 (Drosselklappenpotentiometer 1 & 2): Dual inversely paired potentiometers monitoring throttle plate angle.
G235 (Abgastemperaturgeber 1): Thermocouple exhaust gas temperature sensor used on Audi TT 225 BAM.
gangi (Gang Istwert): Currently engaged transmission gear index (0 = \text{Neutral}, 1\dots 6 = \text{Gears}).
GRA (Geschwindigkeitsregelanlage): Factory cruise control system.
J17 (Kraftstoffpumpenrelais): Main fuel pump power relay switched to ground by ECU Pin 65.
J104 (Steuergerät für ABS/ESP): Electronic stability control module communicating over Drivetrain CAN.
J217 (Steuergerät für Automatikgetriebe): Automatic / Tiptronic transmission control module (TCM).
J220 (Steuergerät für Motronic): Bosch Motronic ME7.5 Engine Control Module (ECM).
J271 (Stromversorgungsrelais Motronic): Master ECU power supply relay (Terminal 30 to Terminal 87).
J285 (Steuergerät im Schalttafeleinsatz): Instrument cluster and CAN gateway module.
J293 (Lüftersteuergerät): Electronic radiator cooling fan control module.
J299 (Relais für Sekundärluftpumpe): High-current relay driving the electric secondary air injection pump.
KFFDLGO (Kennfeld Dämpfungsgrad Antiruckelfunktion): 3D map setting anti-jerk damping coefficients.
KFLBTS (Kennfeld Bauteileschutz): 3D map defining target rich air-fuel ratio when component protection activates.
KFLDHBN (Kennfeld Ladedruck Höchstgrenze): Maximum allowable absolute boost pressure diagnostic ceiling (hPa).
KFLDIMX (Kennfeld Ladedruck Integral Maximal): Maximum dynamic integral ceiling for boost control PID.
KFLDRL (Kennfeld Ladedruckregelung Linearisiert): Open-loop feedforward wastegate duty cycle linearization table.
KFLDRQ (Kennfeld Ladedruckregelung Deaktivierungsschwelle): Integral deactivation threshold for boost PID.
KFLF (Kennfeld Lambdasoll Grundwert): Base target lambda engine volumetric filling map.
KFMIOP (Kennfeld Motormoment Optimal): 3D map translating engine load (r_l) into actual indicated torque.
KFMIRL (Kennfeld Sollfüllung): 3D map translating target indicated torque into target cylinder load (r_{\text{lsol}}).
KFPED (Kennfeld Fahrpedal): 3D map translating accelerator pedal position into driver requested torque.
KFTVSA (Kennfeld Verzögerungszeit Schubabschaltung): Overrun fuel cut-off delay time curve (seconds).
KFZW (Kennfeld Zündwinkel): Base ignition advance timing map active with camshaft retarded (0\text{°}).
KFZW2 (Kennfeld Zündwinkel 2): Alternate ignition advance timing map active with camshaft advanced (22\text{°}).
KFZWOP (Kennfeld Zündwinkel Optimal): Maximum Brake Torque (MBT) optimal ignition timing surface.
KFZWTVS (Kennfeld Zündwinkel bei Katalysatorheizen): Ignition timing map during catalyst warm-up and overrun.
KPDVE (Proportionalbeiwert DVE): Proportional gain constant for the electronic throttle servo motor loop.
KRKTE (Konstante Relative Kraftstoffmenge): Primary conversion factor translating load percentage into fuel pulse (ms/%).
KRMX (Kennfeld Referenzpegel Klopfen): Reference background acoustic noise floor for knock detection.
LAMFA (Lambda Fahrerwunsch): Driver requested enrichment lambda map indexed against engine speed and torque.
lamsbg_w (Lambdasollwert Begrenzt): Final arbitrated target lambda currently commanded by the ECU.
lamsoni_w (Lambdasoll Istwert): Real-time measured air-fuel ratio from the wideband LSU 4.2 sensor.
LDR (Ladedruckregelung): Complete closed-loop turbocharger charge air pressure control subsystem.
ldtv (Ladedruck Tastverhältnis): Final pulse-width modulated duty cycle command sent to wastegate valve N75.
LDRQ0 / LDRQ1 / LDRQ2 (LDR PID Beiwerte): Proportional, Integral, and Derivative gains for boost control.
LDRXN (Höchstgrenze Füllung Normal): Maximum specified cylinder air filling ceiling (static boost limit).
LDRXNZ (Höchstgrenze Füllung Gangabhängig): Maximum specified cylinder air filling ceiling indexed per gear.
mibas (Basismotormoment): Base indicating engine torque calculation before external intervention.
mifa (Fahrermoment): Raw driver requested engine torque derived directly from pedal position.
miist (Motormoment Istwert): Real-time actual indicated engine torque currently generated by combustion.
misolv (Motormoment Sollwert Verzögert): Slow-path target indicated torque arbitrated across all vehicle controllers.
MLHFM (Massenstrom Heißfilmluftmassenmesser): 512-point calibration linearization curve for the MAF sensor.
MLOFS (Massenstrom Offset): Quiescent zero-flow voltage offset constant for the MAF sensor.
MSR (Motorschleppmomentregelung): Engine drag torque control; prevents drive-wheel skid during downshifts.
N75 (Ladedruckregelventil): 3-port pulse-width modulated frequency solenoid controlling the wastegate actuator.
N80 (Magnetventil 1 für Aktivkohlebehälter): EVAP canister regenerative purge solenoid valve.
N112 (Sekundärlufteinblasventil): Vacuum solenoid valve actuating the secondary air injection combivalve.
N205 (Ventil 1 für Nockenwellenverstellung): Hydraulic solenoid controlling intake camshaft advance.
N249 (Umluftventil Turbolader): Electro-pneumatic solenoid valve actuating the diverter bypass valve.
NMAX (Höchstdrehzahl): Main calibrated engine speed governor / rev limiter ceiling.
nmot_w (Motordrehzahl): Live crankshaft rotational speed (RPM).
NWST (Nockenwellensteuerung): Variable valve timing subsystem controlling intake camshaft advance.
plsol (Ladedruck Sollwert): Target absolute boost pressure commanded by the torque manager (hPa).
pvdks_w (Druck vor Drosselklappe): Charge air absolute pressure measured in the intercooler pipe by MAP sensor G31.
pvds_w (Druck im Saugrohr): Intake manifold absolute pressure calculated downstream of the throttle plate.
rkadd_w (Relative Kraftstoffmenge Additiv): Additive idle fuel trim adaptation offset (LTFT at idle).
rl_w (Relative Luftfüllung): Actual relative cylinder air charge (100\% = \text{Stoichiometric swept cylinder mass}).
SLS (Sekundärluftsystem): Secondary Air Injection emissions subsystem.
tabg_w (Abgastemperatur): Modeled exhaust gas temperature calculated in real time by the ATR model (°C).
TABGBTS (Temperaturschwelle Bauteileschutz): Exhaust gas temperature threshold triggering BTS enrichment (typically 950°C).
tans (Ansauglufttemperatur): Intake air temperature measured by thermistor G42 (°C).
TEMIN (Minimale Einspritzzeit): Minimum allowable effective fuel injector opening duration (ms).
TEMINVA (Minimale Einspritzzeit Ventilüberschneidung): Minimum allowable injection duration during valve overlap.
ti_b1 (Einspritzzeit Bank 1): Real-time effective fuel injection duration commanded to fuel injectors (ms).
tmot (Kühlmitteltemperatur): Engine coolant temperature measured by sensor G62 (°C).
TVUB (Totzeit Vorsteuerung Unverzögert Batterie): Fuel injector latency dead time compensation curve vs. voltage.
V144 (Pumpe für Kraftstoffsystemdichtigkeit): Vacuum-driven evaporative Leak Detection Pump (LDP).
vfzg_w (Fahrzeuggeschwindigkeit): Live vehicle road speed measured via transmission Hall sensor G22 or CAN (km/h).
WDKUGDN (Winkel Drosselklappe Untere Grenze Dynamisch): Minimum throttle plate angle threshold during deceleration.
WFS (Wegfahrsperre): Factory anti-theft immobilizer subsystem (WFS2 / WFS3).
wped_w (Fahrpedalwinkel): Driver accelerator pedal position percentage (0.0\%\dots 100.0\%).
Z19 (Heizung für Lambdasonde 1): Front wideband oxygen sensor internal ceramic heating element.
Z28 (Heizung für Lambdasonde 2): Rear secondary oxygen sensor internal heating element.
zwist (Zündwinkel Istwert): Final actual ignition advance currently being commanded to the spark plugs (°BTDC).

Cross-referenced on shared calibration symbols, not on subject matter — these are the chapters that touch the same maps.

Chapter 6 — Memory Geometry & Axes — KFZWOP, FKKVS, DPOVE, KFLDRQ, TEMINVA, DPUVE
Chapter 13 — 121-Pin Harness — Z28, J271, J293, DSLGRAD, DSLOFS, G62
Chapter 25 — Troubleshooting & Failsafes — G70, J271, B_LR, DKV_W, LDR, G62
Chapter 3 — Benchmark Calibrations — DPOVE, DPUVE, CWDLSAHK, DSLGRAD, DSLOFS, KFTVSA
Chapter 2 — Bosch Project Taxonomy — CDATR, MSR, KFLF, G40, J104, J285
Chapter 12 — RAM Logging & .ecu Files — PLSOL, PVDS_W, RKADD_W, LAMSBG_W, DKV_W, LDTV