Circuit-test DCL-420 Specifications

Mercedes-Benz Vehicle Communication Software ManualAugust 2013EAZ0025B41D Rev. A

4Chapter 3 OperationsIdentifying the VehicleThe Scanner typically identifies a vehicle using certain characters of the vehicle identification number (

94Data Parameters Transmission ParametersSHIFT VALVE 1-2/4-5SHIFT VALVE 2-3SHIFT VALVE 3-4Range: ____________________________________________________

95Data Parameters Transmission ParametersSPEED DEV. DISENGAGE CLUTCH(1MIN)Range: ______________________________________________________ not availableU

96Data Parameters Transmission ParametersTRANSMISSION OVERLOAD PROTECTIONTRANSMISSION OVERLOAD PROTECTION INTERTRANSMISSION OVERLOAD PROTECTION FEEDBA

97Data Parameters Transmission ParametersUNFILTERED SELECTOR LEVER POSITIONRange: ___________________________________________________________PN/RD1Use

98Appendix A Troubleshooting and Communication ProblemsStartup TroubleshootingIf the display does not light up when you connect the Scanner to vehicle

99Troubleshooting and Communication Problems Common ProblemsCommon ProblemsSome common problems that may prevent communication between the Scanner and

100Appendix B Terms, Abbreviations and AcronymsTermsThe following terms are used throughout this manual to explain certain operations and displays:Abb

101Terms, Abbreviations and Acronyms Abbreviations and AcronymsAFE automatic lane recognitionAG automatic transmissionAGW audio gatewayAHV trailer hit

102Terms, Abbreviations and Acronyms Abbreviations and AcronymsCNS communication and navigation systemCOMAND cockpit management and data systemCST cab

103Terms, Abbreviations and Acronyms Abbreviations and AcronymsEMSC electric mirror and steering column, heated and adjustmentENR electronic level adj

5Operations Identifying the VehicleWhen multiple engine choices are listed, only the correct engine choice communicates with the Scanner. If the Scann

104Terms, Abbreviations and Acronyms Abbreviations and AcronymsHDFS remote trunk lid lockingHFM hot film engine management systemHFM-SFI HFM with sequ

105Terms, Abbreviations and Acronyms Abbreviations and AcronymsLLR Idle speed controlLOC low compressionLRH steering wheel heaterLS power steering gea

106Terms, Abbreviations and Acronyms Abbreviations and AcronymsPTS Parktronic systemPW power windowsPWM pulse width modulationR reverse gearRA repair

107Terms, Abbreviations and Acronyms Abbreviations and AcronymsSRU manifold vacuum assistSTH stationary heaterTAU Tempmatic (air conditioning)TB throt

108IndexAactuator testsengine 12CCAN bus 15, 16, 19and DAS 15codes 11definition 100Main Menu selection 11connectors. See vehicle connectorsDDAS

6Operations Selecting a SystemSelecting a SystemOnce you have confirmed a vehicle identification, the System List menu displays. This menu shows all t

7Operations Connecting to a VehicleEach test adapter connects to one of the following vehicle diagnostic connectors.Figure 3-1 MB-1 adapter Figure 3-2

8Operations Connecting to a VehicleFigure 3-4 38-pin connector—fits MB-1 adapterPin Function Pin Function1Ground, circuit 31 (W12, W15, electronics gr

9Operations Connecting to a VehicleFigure 3-5 16-pin OBD-I connector—fits MB-2 adapterUS Models California Models Only (With LED)Pin Function Pin Func

10Operations Connecting to a VehicleFigure 3-6 8-pin connector—fits MB-2 adapterFigure 3-7 16-pin OBD-II connector—fits DL-16 adapterPin Function1 Gro

11Operations Selecting a Testz Note the following when connecting the Scanner to the vehicle:• “Left” or “Right,” when included in the connection mess

12Operations Main Menu Selectionsavailable, The type of data available, and the order in which the groups are listed varies by model. A typical data g

13Operations Scanner Demonstration ProgramSpecial FunctionsThis selection opens a menu of unique tests, such as relearn procedures. Follow the on-scre

iiTrademarks AcknowledgementsSnap-on is a trademark of Snap-on Incorporated.All other marks are trademarks of their respective holders.Copyright Infor

14Chapter 4 TestingThis chapter provides limited information and procedures for the following control systems:• Engine (gas)– CIS-E– LH– HFM– ME versi

15Testing Testing DAS (Immobilizer) Systemscontrol and traction control (ASR). Vehicles with ASR usually have an orange warning light on the instrumen

16Testing Testing DAS (Immobilizer) Systems(IFZ) was introduced in late 1992 as a standard feature. With central locking, lock actuators are no longer

17Testing Testing DAS (Immobilizer) SystemsNOTE:i On some models, the green and red LEDs on the rear view mirror flash alternately if the engine will

18Testing Testing DAS (Immobilizer) SystemsDAS 2bDAS 2b (170/129/140) was introduced in 1998. This system uses a three-button remote with both infrare

19Testing Testing DAS (Immobilizer) SystemsNote the following when working on DAS 3 systems:•The electronic key is completely separate from the remote

20Testing Testing DAS (Immobilizer) Systemscapacitive sensors. The 2nd generation Keyless Go no longer uses a separate chip card but has the Keyless G

21Chapter 5 Data ParametersWhen DATA is selected, the Scanner displays all of the operating parameters available from the electronic control unit (ECU

22Data Parameters Alphabetical Parameter ListAlphabetical Parameter ListNumerics3RD GEAR DOWN...

23Data Parameters Alphabetical Parameter ListAIR PUMP SWITCHOVER VALVE, LEFT ...

iiiSafety InformationFor your own safety and the safety of others, and to prevent damage to the equipment and vehicles upon which it is used, it is im

24Data Parameters Alphabetical Parameter ListCLUTCH DEPRESSED...

25Data Parameters Alphabetical Parameter ListCRUISE CONTROL SWITCH B...

26Data Parameters Alphabetical Parameter ListECT SENSOR ...

27Data Parameters Alphabetical Parameter ListFUEL TANK CAP ...

28Data Parameters Alphabetical Parameter ListINCREASED MODULATING PRESS.STATUS ...

29Data Parameters Alphabetical Parameter ListKNOCK SIGNAL...

30Data Parameters Alphabetical Parameter ListMULTIPLE IGN. MISF. TWC PROTECT...

31Data Parameters Alphabetical Parameter ListO2S CONTROL, UPSTREAM CAT(%)...

32Data Parameters Alphabetical Parameter ListPURGE FACTOR F 4...

33Data Parameters Alphabetical Parameter ListSELF-ADAPTATION, IDLE SPEED ...

ivSafety Information Important Safety InstructionsSafety messages contain three different type styles.• Normal type states the hazard.• Bold type stat

34Data Parameters Alphabetical Parameter ListTTANK FILL LEVEL...

35Data Parameters Alphabetical Parameter ListVVALVE CURRENT 1 (MA)...

36Data Parameters Engine ParametersEngine ParametersA/C COMPRESSORRange: __________________________________________________________ ON/OFFUsed on DM2,

37Data Parameters Engine ParametersACTUAL PRESSURE DISTRIB.PIPERange: _____________________________________________________0 to 1000 mbarUsed on ERE/E

38Data Parameters Engine ParametersADAPT. RANGE 2 GEAR, 6000-3000ADAPT. RANGE 2 GEAR, 6000-4000ADAPT. RANGE 4 GEAR, 2500-1500ADAPTED RANGES L1ADAPTED

39Data Parameters Engine ParametersAIR LOGIC CHAINRange: __________________________________________________________ YES/NOUsed on DM2 systems. This pa

40Data Parameters Engine ParametersBAROMETRIC PRESSUREALTITUDE PRESSURERange: ________________________________________________0 to 1000, ±100 mbarAMBI

41Data Parameters Engine Parametersensure communication if one wire is damaged and provide the ability to recognize a CAN circuit fault. The two lines

42Data Parameters Engine ParametersCAMSHAFT SIGNAL, RIGHT BANKCAMSHAFT SIGNAL, LEFT BANKRange: _______________________________________________________

43Data Parameters Engine ParametersCAN RECEPTION FROM LH1-SFICAN RECEPTION FROM LH2-SFIRange: _______________________________________________________

vContentsSafety Information... iiiCo

44Data Parameters Engine ParametersCHECK ENGINE AFTER FULFILLING FAULT SEQUENCERange: __________________________________________________________ YES/N

45Data Parameters Engine ParametersCOIL SPARK DURAT. T1/1 CYL. 1/4COIL SPARK DURAT. T1/1 CYL. 2/5COIL SPARK DURAT. T1/2 CYL. 2/3COIL SPARK DURAT. T1/2

46Data Parameters Engine ParametersCOOLING FAN OUTPUT DEMAND ENGINERange: __________________________________________________________ ON/OFFCOOL.FAN OU

47Data Parameters Engine ParametersCRUISE CONTROL LEVER POSITION VARIABLECRUISE CONTROL LEVER SIGNAL IMPLAUSIBLECRUISE CONTROL OFFCRUISE CONTROL RESTA

48Data Parameters Engine Parametersbetween engines and engine wear. Each change in the Long Term Fuel Trim is equivalent to a change of the Short Term

49Data Parameters Engine Parametersparameter name indicates twelve separate parameters, one for each cylinder. The display reads OFF when fuel injecti

50Data Parameters Engine ParametersDESIRED ENGINE SPEEDRange: _____________________________________________________ 0 to 1500 RPMUsed on HFM systems.

51Data Parameters Engine ParametersECT LH1ENGINE COOLANT TEMP. 1ECT LH2ENGINE COOLANT TEMP. 2Range: __________________________________________________

52Data Parameters Engine ParametersTurbo systems rely on the ECU to vary current to the EGR switchover valve, which regulates vacuum to the EGR valve.

53Data Parameters Engine ParametersENGINE OIL LEVELRange: _______________________________________________________ OK/NOT OKUsed on ME10 systems. This

viContentsAppendix B: Terms, Abbreviations and Acronyms... 100Terms ...

54Data Parameters Engine ParametersEXHAUST GAS TEMPERATUREEXHAUST TEMPERATURE (TWC MODEL)Range: ______________________________________________________

55Data Parameters Engine ParametersFUEL RACK POSITIONRange: __________________________________________________________ variableUsed on EDS diesel syst

56Data Parameters Engine ParametersHOT WIRE AIR MASSHOT FILM MASS AIR FLOW SENSORRange: ______________________________________________________ 0 to 50

57Data Parameters Engine ParametersIFI/DFI RECEIVING FROM ETC (722.6)Range: __________________________________________________________ ON/OFFIFI/DFI R

58Data Parameters Engine ParametersINERTIA FUEL SHUTOFFRange: _________________________________________________ ON/OFF or YES/NOUsed on ME27 and ME28

59Data Parameters Engine ParametersINJECTION TIME, LEFT BANKINJECTION TIME, RIGHT BANKINJECTION TIME, CYLINDER 1 to 3INJECTION TIME, CYLINDER 4 to 6IN

60Data Parameters Engine ParametersIRREGULAR RUNNING SHUTOFF VALUERange: __________________________________________________________ variableUsed on ME

61Data Parameters Engine Parameterscenter. Rather, it indicates the number of degrees of advance subtracted per cylinder until detonation stops.KNOCK

62Data Parameters Engine Parameterscheck is to add both readings (R1 and R2) together at various throttle positions. They should add up to the same va

63Data Parameters Engine ParametersLEFT WOT (FULL LOAD)/DECEL.SHUT-OFFRange: __________________________________________________________ YES/NOUsed on

1Chapter 1 Using This ManualThis manual contains instructions for testing Mercedes-Benz vehicles. Some of the Illustrations shown in this manual may c

64Data Parameters Engine ParametersLOWER P. LOAD F. TRIM CYL 1-6, RIGHTLOWER P. LOAD F. TRIM CYL 4-6, RIGHTLOWER P. LOAD F. TRIM CYL 7-9, LEFTLOWER P.

65Data Parameters Engine ParametersMAX. INDICATED ENGINE TORQUEMIN. INDICATED ENGINE TORQUERange: ____________________________________________________

66Data Parameters Engine Parametersengines have an airflow sensor to measure the mass, or weight, of air entering the engine. The airflow sensor deliv

67Data Parameters Engine ParametersO2 SENSOR, DOWNSTREAM CAT, CYL 1-3; 4-6; 7-9; 10-12O2 SENSOR, DOWNSTREAM CATO2 SENSOR, DOWNSTREAM CAT, LEFTO2 SENSO

68Data Parameters Engine ParametersO2S (LAMBDA) CTRL CTP (IDLE) MEANRange: _________________________________________________________ 0 to 100%Used on

69Data Parameters Engine ParametersO2S VOLTAGE AFTER TWCO2S VOLTAGE AFTER TWC LEFTO2S VOLTAGE AFTER TWC RIGHTRange: __________________________________

70Data Parameters Engine Parameters50% duty cycle is the base point, so a 50% reading indicates no ECU fuel correction. Readings above 50% indicate th

71Data Parameters Engine Parameterssystems, the data parameter display ranges from 0.680 to 1.320; on ME27 systems, from 0.750 to 1.280.PEDAL VALUE SE

72Data Parameters Engine ParametersPURGE VALVE DUTY CYCLERange: __________________________________________________________ variableUsed on HFM, ME10,

73Data Parameters Engine ParametersRESONANCE FLAP INT. MANIF. ACTUALRESONANCE FLAP INTAKE PIPE ACTUALRange: __________________________________________

2Using This Manual Notes and Important MessagesScan ToolThe term “scan tool” is used to refer to any tool that communicates directly with the vehicle

74Data Parameters Engine ParametersRIGHT O2S (LAMBDA) CONTROL FAULTRange: __________________________________________________________ YES/NOUsed on ME1

75Data Parameters Engine ParametersSELECTED GEARRange: ______________________________________________________ P,R,N,1,2,3,4Used on HFM, LH, ME10, and

76Data Parameters Engine ParametersSELF-ADAPTATION IDLE SP. AIRRange: _____________________________________________ X.XX kg/h or –15 to 15%Used on LH

77Data Parameters Engine Parametersare a lean correction, or reduced injector time. The ECU attempts to compensate for tolerances in the mixture by me

78Data Parameters Engine Parametersthe base point, or no correction. Readings above 1.0 indicate a rich correction, or increased fuel, and readings be

79Data Parameters Engine ParametersScanner as a Functional Test. A lower threshold enables the ECU to detect less severe misfires indicated by reading

80Data Parameters Engine ParametersSTART APPROVALRange: __________________________________________________________ YES/NOUsed on LH systems. This show

81Data Parameters Engine ParametersSTARTER CONTROLRange: __________________________________________________________ YES/NOSTARTER LOCK-OUT OUTPUTSTART

82Data Parameters Engine ParametersECU closes the purge control valves and monitors vacuum for 30 seconds to ensure there is no decrease due to a mino

83Data Parameters Engine ParametersTORQUETORQUE CORR. VALUE DURING SHIFTTORQUE DIFFERENCE SUMTORQUE LOSSRange: _______________________________________

3Chapter 2 IntroductionThe Mercedes-Benz Vehicle Communication Software provides extensive vehicle-specific engine, transmission, antilock brake syste

84Data Parameters Engine ParametersTWC TEMPERATURE FROM OBD 2Range: __________________________________________________________ variableUsed on HFM sys

85Data Parameters Engine ParametersVEHICLE SPEED FRONT AXLEVEHICLE SPEED REAR AXLERange: ___________________________________________________ 0 to vehi

86Data Parameters Transmission ParametersTransmission Parameters5TH GEARRange: __________________________________________________________ ON/OFFUsed o

87Data Parameters Transmission Parameterswithin eight cells or memory bocks. Each memory block contains specific input values (comparisons) as well as

88Data Parameters Transmission ParametersCONVERSIONRange: ______________________________________________________ not availableUsed on the EGS system.

89Data Parameters Transmission ParametersENGINE RUN TIME LONG TERM MONITORENGINE RUN TIME SHORT TERM MONITORRange: ___________________________________

90Data Parameters Transmission Parametersgrade. The transmission control module (TCM) relies on this calculated value to make shift adjustments. While

91Data Parameters Transmission ParametersLOW RANGE PROGRAMRange: __________________________________________________________ ON/OFFUsed on the EGS syst

92Data Parameters Transmission ParametersA leaf spring that rests against the valve body presses the sensors against the transmission housing. This in

93Data Parameters Transmission Parametersidentifiers are stored in its acceptance list. This very high frequency transmission requires a “twisted pair