CHARGING 2001-04.pdf

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    harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause

    system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure anyaftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If no fault is found,check for conditions that might cause an intermittent situation.

    SERVICE PRECAUTIONS

    BATTERY DISCONNECT/CONNECT

    Disconnect/Connect Procedures

    1. Turn off ignition. Open engine hood. After opening vehicle wait at least 4 minutes before disconnecting battery or alarm will be triggered.

    2. Connect quiescent current retention unit, if necessary.

    3. Disconnect negative battery cable (1) and insulate cable lug to prevent unwanted contact with ground point (W16/4). See Fig. 2 .4. To connect, reverse disconnect procedure.5. If quiescent current retention unit was not used, perform basic programming. See BASIC

    PROGRAMMING . Using appropriate scan tool, retrieve and erase any DTCs stored in memory. SeeRETRIEVING & ERASING DIAGNOSTIC TROUBLE CODES .

    NOTE: Numbers and let ters in text refer to numbers and let ters in f igures .

    2003 Mercedes-Benz SLK320

    2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 170.465 & 170.466 Chassis

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    Fig. 2: Disconnecting Negative Battery Cable Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    BASIC PROGRAMMING

    1. Code radio. See CODING RADIO .

    2. Set time on instrument cluster. Pull out knob at lower right of speedometer. To adjust hour, turn to right.To adjust minute, turn to left.3. If necessary, set time at stationary heater timer.4. Start engine and run at idle. Turn steering wheel from one lock position to the other to activate steering

    angle sensor. Center steering wheel. Malfunction indicator lamp should go out.5. If equipped, normalize tilting/sliding roof. Open sunroof and hold down switch. Sunroof moves to end

    position and pulls back 1/4 turn and stops. If equipped with lemella sliding roof, close roof and keep

    switch pressed for 5 to 10 seconds.6. Normalize power windows. Completely close each window with manual switch. Hold switch in closed position for 5 seconds.

    Coding Radio

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    1. Turn ignition on. CODE will appear on radio display. Enter first code number with station button. For

    example, station button 1 is number 1.2. After entering first number, CODE will disappear and first number entered will appear followed by 4

    dashes. The next character to be entered flashes.3. After entering all 5 numbers the first character starts flashing again. If an input error has occurred it can

    be corrected at this time by reentering the complete correct code.4. Press TUNE, AUTO/SEEK or SC button. If code is correct, radio automatically switches on and indicates

    the station or frequency stored with station button 1. If an incorrect code number has been entered, CODE

    appears again on display. If an incorrect code is entered 3 times, WAIT appears on display and radiolocks up for approximately 10 minutes. If an incorrect code is entered 3 times again, radio locks up forapproximately 10 additional minutes. After 9 incorrect attempts, lock time increases to 60 minutes.Another 3 incorrect entries locks up radio for another 60 minutes. Radio must remain switched on duringlock up time.

    TESTING

    Generator malfunctions may cause a Diagnostic Trouble Codes (DTCs) to be stored in Motor ElectronicsSequential Fuel Injection (ME-SFI) system. After repairs are completed check for and erase any DTCs stored in(ME-SFI) system. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If cause ofgenerator malfunction is not engine performance related, replace generator.

    RETRIEVING & ERASING DIAGNOSTIC TROUBLE CODES

    RETRIEVING DIAGNOSTIC TROUBLE CODES

    To retrieve codes using hand held tester, see Fig. 3 .

    NOTE: Before replacing any component that scan tool suggests are faulty, ensure thatall wiring connections and harness connector s are okay. Ensure that power andground circuits are functioning properly. For circuit identification, seeappropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEMWIRING DIAGRAMS for vehicle being tested.

    NOTE: For diagnostic equipment connections, see FAULT CODE DIAGNOSISEQUIPMENT CONNECTION .

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    Fig. 3: Retrieving Codes Using Hand Held Tester Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    CLEARING DIAGNOSTIC TROUBLE CODES

    Disconnecting vehicle battery will not erase codes. Follow scan tool equipment manufacturers instructions toerase fault codes.

    FAULT CODE DIAGNOSIS EQUIPMENT CONNECTION

    To connect hand held tester scan tool to Mercedes-Benz data link connector, see Fig. 4 . To connect hand heldtester scan tool to OBD-II data link connector, see Fig. 5 .

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    Fig. 4: Connecting Hand Held Tester Scan Tool To Mercedes-Benz Data Link Connector Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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    Fig. 5: Connecting Hand Held Tester Scan Tool To OBD-II Data Link Connector Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    ON-VEHICLE TESTING

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    less than 13 volts, inspect and repair high resistance at charging system connections.

    3. If charging system connections are okay, using an oscilloscope, test diodes in generator. See DIODETEST . If diodes are okay, replace voltage regulator. See VOLTAGE REGULATOR underREMOVAL & INSTALLATION. If diodes are bad, replace generator. See GENERATOR underREMOVAL & INSTALLATION.

    Fig. 7: Identifying Voltage Regulator Control Tester Connection Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    DIODE TEST

    Connect engine tester with oscilloscope. See Fig. 8 . Start engine. Switch on low beam. Access diode test at3000 RPM. See Fig. 9 -Fig. 11 . Replace generator as necessary.

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    Fig. 8: Identifying Oscilloscope Connection For Diode Check Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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    Fig. 10: Identifying Oscilloscope Patterns (Positive Diode Defective) Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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    2003 M d B SLK320

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    Fig. 11: Identifying Oscilloscope Patterns (Negative Diode Defective) Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    REMOVAL & INSTALLATION

    GENERATOR

    Removal & Installation

    1. Disconnect and shield negative battery cable. See BATTERY DISCONNECT/CONNECT underSERVICE PRECAUTIONS.

    2. Remove "V" belt by swiveling tensioning pulley aside and holding in place with a drift. Detach lowerengine compartment paneling. Remove protection against accidental electrical contact (4). Disconnectelectrical connectors at generator. Remove bolts (3). Remove generator downward. See Fig. 12 and Fig.13 .

    NOTE: Numbers in text refer to numbers in f igures.

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    3. To install, reverse removal procedure. Tighten fasteners to specification. See TORQUE

    SPECIFICATIONS .

    Fig. 12: Removing Generator (1 Of 2) Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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    Fig. 13: Removing Generator (2 Of 2) Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    VOLTAGE REGULATOR

    Removal & Installation

    Compact Generator

    1. Disconnect and shield negative battery cable. See BATTERY DISCONNECT/CONNECT underSERVICE PRECAUTIONS.

    NOTE: Numbers in text refer to numbers in f igures.

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    2. Remove generator from vehicle. See GENERATOR .

    3. Remove 3 screws (1). Unclip cover (2) by pushing apart retaining lugs (3) and remove. Remove 2 screws(4). Remove regulator (5) toward side. See Fig. 14 .

    4. To install, reverse removal procedure. When inserting regulator (5), ensure ground lug (6) makes contactwith regulator.

    Fig. 14: Removing Voltage Regulator (Compact Generator) Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    OVERHAUL

    TORQUE SPECIFICATIONS

    NOTE: Manufacturer does not recommend overhaul of generator.

    2003 Mercedes Benz SLK320

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    TORQUE SPECIFICATIONS

    WIRING DIAGRAMS

    Application Ft. Lbs. (N.m)Generator Mounting Bolts 30 (42)B+-To-Generator Nut (15)

    INCH Lbs. (N.m)D+-To-Generator Nut 35 (4)

    NOTE: See CHARGING SYSTEM wiring diagram in appropriate SYSTEM WIRINGDIAGRAMS article in ELECTRICAL.

    2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 170.465 & 170.466 Chassis