🏷️ Basic Information

Make:

Mercedes-Benz

Product Name:

Mercedes Benz Tempomat Cruise 124 129 140 201 602 603 605 606 Service Repair Manual

Chassis Codes Covered:

W124, R129, W140, W201, W126 (implied by engine codes), W463 (implied by engine codes)

Engine Codes Covered:

M102, M103, M104, M111, M116, M117, OM601, OM602, OM603, OM605, OM606

👋 Introduction

Market Segment:

Premium automotive aftermarket service information, targeting owners and independent repair facilities specializing in Mercedes-Benz vehicles of the late 1980s and 1990s.

Target Audience:

DIY enthusiasts, independent Mercedes-Benz specialists, and workshop technicians seeking detailed technical information to maintain and repair the Tempomat system on these classic Mercedes-Benz models.

Competitors:

Official Mercedes-Benz workshop manuals (WIS), Haynes manuals, Chilton manuals, other third-party service manual providers.

Key Selling Points:

Instant download accessibility, comprehensive coverage of the Tempomat system across multiple popular chassis, detailed technical diagrams, and step-by-step repair instructions.

Ease Of Use:

Designed for users to easily navigate through sections, print specific pages, and follow step-by-step instructions, making complex repairs more accessible.

📋 Manual Details

Coverage Scope:

Tempomat (Cruise Control) system, associated electronic and mechanical components, and general vehicle maintenance and repair relevant to the covered chassis and engines.

Estimated Page Count:

Varies based on specific model year coverage and detail level, but typically comprehensive manuals for this era range from 500 to 2000+ pages.

Manual Type:

Service and Repair Manual

Language:

Likely English, based on common practice for aftermarket service manuals derived from international sources.

Format:

Digital Download (PDF)

📖 Manual Coverage

Tempomat System:

Operation, diagnostics, component testing (actuators, control units, switches), troubleshooting common malfunctions, repair procedures, adjustments, and wiring diagrams specific to the Tempomat system.

Engine Management:

Basic principles, component identification, sensor testing, fuel injection system details relevant to Tempomat operation, and diagnostic codes.

Electrical System:

Wiring diagrams for Tempomat and related circuits, fuse box locations, relay functions, power distribution, and common electrical troubleshooting techniques.

Brake System:

Interaction with Tempomat, ABS integration where applicable, and brake system maintenance relevant to vehicle control.

Vehicle Maintenance:

General maintenance procedures, fluid types and capacities, lubrication, filter replacement, and component checks.

Body And Chassis:

Basic information on body components, interior trim removal for access to switches and wiring, and chassis adjustments relevant to vehicle handling which indirectly impacts cruise control performance.

Diagnostic Tools:

Mention of required diagnostic tools, such as multimeters, and potentially early scan tools or diagnostic testers specific to Mercedes-Benz for this era, if used for Tempomat diagnostics.

Diagnostic Procedures:

Step-by-step troubleshooting guides for Tempomat system faults, including symptom analysis and component testing.

Repair Procedures:

Detailed instructions for disassembly, cleaning, inspection, repair, and reassembly of Tempomat system components, including the stalk, control unit, and speed sensors.

Maintenance Procedures:

Routine checks, lubrication points, and adjustments for the Tempomat system and related vehicle components.

Component Replacement:

Guidance on replacing specific parts of the Tempomat system, such as the cruise control stalk, vacuum actuator (older systems), electronic control unit, and related wiring harnesses.

Electrical Troubleshooting:

Detailed troubleshooting steps for electrical faults within the Tempomat circuit, including using multimeters to check continuity, voltage, and resistance of various components and wiring.

Component Identification:

Identification and location of all Tempomat system components, including the stalk switch, control module, speed sensors, vacuum lines, and related relays.

Wiring Diagrams:

Comprehensive wiring schematics for the Tempomat system, including power, ground, signal lines, and component interconnections, crucial for electrical diagnosis and repair.

Depth Level:

Comprehensive, covering from basic operation and maintenance to advanced diagnostics and repair of the Tempomat system, including detailed technical specifications and wiring diagrams.

Diagnostic Codes:

Information on diagnostic trouble codes (DTCs) related to the Tempomat system, if applicable to the specific electronic control units of the era, and methods for retrieving them.

Component Testing Specs:

Specific voltage, resistance, and current values for testing various components within the Tempomat system (e.g., speed sensor output, switch actuation voltage).

📊 Manual Specifications

File Format Details:

PDF, allowing for digital access, searching, and selective printing of sections.

Searchability:

Likely searchable text within the PDF, allowing users to quickly find specific terms, procedures, or part numbers.

Print Quality Description:

High-resolution, suitable for printing individual pages or sections for workshop use. Includes clear diagrams and schematics.

Diagram Clarity:

High-quality reproduction of original manufacturer diagrams, ensuring clarity for wiring schematics, system layouts, and component illustrations.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Family Examples:

M102 (2.0-2.3L Inline-4), M103 (2.6-3.0L Inline-6), M104 (2.8-3.2L Inline-6 DOHC), M111 (2.0-2.3L Inline-4 Supercharged/Naturally Aspirated), M116/M117 (3.8-5.6L V8), OM601 (2.0-2.3L Inline-4 Diesel), OM602 (2.5-2.9L Inline-5 Diesel), OM603 (3.0-3.5L Inline-6 Diesel), OM605 (2.0-2.5L Inline-5 Diesel), OM606 (3.0-3.4L Inline-6 Diesel).

Engine Displacement Range:

Approximately 2.0L to 5.6L for gasoline engines, and 2.0L to 3.4L for diesel engines.

Performance Characteristics:

Varies widely by specific engine and chassis. Engines covered span from efficient 4-cylinder diesels to powerful V8 gasoline units. Tempomat functionality is generally speed-dependent and calibrated to specific vehicle performance parameters.

Fuel System Types:

Mechanical fuel injection (K-Jetronic, KE-Jetronic), Electronic Fuel Injection (EFI) systems like Bosch KE-Jetronic, HFM, ME (in later models within the era), and Diesel Injection Pumps (mechanical and early electronic).

Engine Management Interface:

The Tempomat system communicates with the engine control unit (ECU) to regulate throttle position and maintain speed. Understanding the ECU's role and its parameters is often necessary for advanced diagnostics.

🔧 Transmission

Transmission Types Covered:

4-speed and 5-speed automatic transmissions (e.g., 722.3, 722.4, 722.5, 722.6 for later models), 4-speed and 5-speed manual transmissions.

Optional Transmission Features:

Electronic control modules for automatic transmissions, which often interface with the Tempomat system for smoother operation and gear selection.

Transmission Fluid Specifications:

Specific ATF (Automatic Transmission Fluid) types are crucial, typically MB 236.x specifications (e.g., MB 236.8 for older 4-speed automatics, MB 236.10/12 for newer 5-speed automatics). Manual transmission fluid (MTF) specifications vary.

Transmission Control Module Interaction:

Electronic Transmission Control (ETC) modules on later automatic transmissions often work in conjunction with the Tempomat system to optimize gear selection for smooth acceleration and deceleration while maintaining set speed.

📐 Dimensions

Exterior Dimensions Range:

The chassis covered represent a range from compact sedans (W201) to executive sedans (W140) and luxury coupes/convertibles (R129). Specific dimensions are model-dependent and not explicitly detailed for the Tempomat system alone.

Interior Features Relevant To Tempomat:

Placement and functionality of the Tempomat control stalk on the steering column, dashboard indicator lights.

Weight Specifications:

Varies significantly by model and engine. Vehicle weight affects Tempomat performance, especially during uphill/downhill speed maintenance.

🛡️ Safety Features

Safety Ratings Era:

Vehicles of this era (late 80s-90s) typically received good safety ratings for their time, with features like ABS, airbags (driver and passenger), crumple zones, and reinforced passenger compartments. Tempomat itself is a convenience feature, not a direct safety device, but its proper function contributes to stable driving.

Active Safety Systems:

Anti-lock Braking System (ABS) is a common feature that often interfaces with powertrain and cruise control systems. Traction Control System (ASR) also became available on some models.

Passive Safety Features:

Airbags, seatbelt pre-tensioners, reinforced chassis structure, side impact protection.

💡 Technology Features

Infotainment Systems:

Basic for the era. Primarily focused on audio systems (radio, cassette, CD players). No advanced infotainment or touchscreens. Tempomat functionality is separate from the audio/infotainment system.

Driver Assistance Features:

Tempomat (Cruise Control) is the primary driver assistance feature covered. ABS and ASR are also relevant driver assistance systems that may interact with or be serviced alongside Tempomat.

Speed Sensors:

The system relies on accurate wheel speed sensor data (often from ABS) or dedicated speed sensors to determine vehicle speed for Tempomat operation.

Connectivity Options:

Limited to diagnostic ports for engine and transmission control units. No external connectivity or mobile integration.

🔧 Maintenance

Tempomat Related Service:

Tempomat system itself generally requires minimal routine maintenance beyond checks during regular service. Key areas include checking the stalk functionality, ensuring indicator lights work, and verifying proper operation during test drives. Electrical connections and vacuum lines (on older systems) should be inspected for integrity.

Brake Service Relevance:

Proper brake system maintenance, including brake pad and rotor condition, is important for overall vehicle safety and control, indirectly supporting the reliable function of cruise control.

Related Fluid Specs:

Engine oil grades (e.g., SAE 5W-40, 10W-40, 15W-40 depending on temperature and specific engine oil specification like MB 229.1 or 229.3), coolant (e.g., MB 325.0), brake fluid (e.g., DOT 4), and ATF for automatic transmissions are critical and detailed in full service manuals. The Tempomat system itself does not use fluids.

Common Tempomat Faults:

Faulty cruise control stalk switch contacts, failing vacuum actuators (older systems), problematic electronic control modules (ECU), wiring harness degradation, speed sensor issues, and intermittent operation due to poor electrical connections.

Intermittent Operation:

Intermittent faults are common and often traced to worn electrical contacts in the turn signal/cruise control stalk, or loose/corroded connectors at the control module or speed sensors.

📚 Vehicle History

Mercedes Benz Legacy:

Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and luxury, particularly in the development of advanced automotive technologies like cruise control (Tempomat).

Tempomat Development Era:

The Tempomat system, first introduced by Mercedes-Benz in 1975, evolved significantly through the 1980s and 1990s, transitioning from mechanical/vacuum-actuated systems to fully electronic control, integrating with engine management and transmission control units.

Tempomat Integration:

The Tempomat system was progressively integrated with other vehicle electronics, including engine management and transmission control, becoming a more sophisticated and reliable feature over the production years of these chassis.

Production Period Covered:

The covered chassis (W124, R129, W140, W201) were primarily produced from the mid-1980s through the late 1990s. Engine codes further refine the applicable model years within this range.