Tech Tip: Mercedes-Benz A/C Off Light Illuminated, A/C Not Functioning
If you receive customer reports in the above models that the A/C Off light is illuminated and cannot be switched off and the air conditioning is not functional, the Refrigerant Level Temperature Pressure Sensor coding in the AAC unit may need to be set to “INACTIVE.” Follow the below procedure to remedy a specification parameter in the refrigerant level logic circuit.
Tech Tip: All Wheel Drive Synergies for Brakes, Transmission and Transfer Case
There are very few all-mechanical controls left on late-model vehicles. Almost all powertrain controls are electromechanical using a computer as the controller. These include powertrain control of the accelerator pedal with the latest being All Wheel Drive (AWD). The brakes and damping are also electromechanical under electronic control. There are peripheral systems that are all computer controlled such as Electronic Stability Control (ESC) and Adaptive Cruise Control (ACC).
Tech Tip: No or Insufficient Cooling Output in Mercedes-Benz C-Class
If an owner of a 2004 C 240 Sedan complains of no or insufficient cooling output, it could be caused by the refrigerant line, whose inner coating has come loose in the flexible section of the hose, causing constriction.
Can do CAN: A Simple Look at a Complex System
Ever wonder how your cable TV comes into your home on that single coaxial cable? In simple terms… it’s like a CAN system. A good definition of a CAN system would be: High speed communication sent via data lines to and from components.
Mercedes Tech Tip: Leaks at Internal Steering Lines or Steering Gear Housing
If you experience leakage at the steering line connection in the above model vehicles, replacement of the entire rack and pinion system is not required. You may now replace the O-rings, which are available as separate parts for repairs of the affected steering line.
Mercedes-Benz Tech Tip: Battery Acid Leaking into Battery Box
If you receive customer reports in Model 163.154/157/172/174/175 vehicles, all model years, of acid leaking from the battery ventilation hole causing damage to the battery box, follow the remedy procedures below which detail installing a hose/receptacle combination.
Tech Tip: Mercedes-Benz MIL On/DTC P2034 Stored in ECU
If you receive customer reports in the affected model vehicles of the “check engine” light being activated after starting the engine, and code P2034 is stored in the engine control unit, the cause may be that the
Tech Tip: Mercedes-Benz Suspension/ABS-Steering Angle Sensor Service
For Model 163 vehicles, including the 2003 ML 350, ensure WIS document AR46.10-P-0400GH is followed and adhered to when removing and installing the jacket tube. Do not separate the coupling below the steering angle sensor (N49) or damage to the sensor rotor may occur.
Tech Tip: Mercedes-Benz Low-Range Light Flashes, Code P1831
If you receive customer reports on an applied vehicle of the low-range light flashing rapidly (18 times) after vehicle start with fault code P1831 (Positioner motor, position sensor or power supply is faulty) in the transfer case ECU, do not replace the transfer case motor. This is caused by temporary loss of communication between the transfer case control module and the shift motor position sensor ….
Tech Tip: Diagnosing Incorrect Oil Level Message on Mercedes-Benz
You may encounter instances on any of the subject models where the engine oil level is OK, but the instrument cluster is displaying any one of the following three messages: Oil level below minimum; Oil level above maximum; or Engine oil level – visit workshop. Check if the engine has the appropriate oil dipstick. Correct the oil dipstick if necessary. Disregard this step if the engine is not ….
Tech Tip: Mercedes-Benz High Oil Consumption
If you encounter instances in Model 163.1 up to Chassis No. 357786 of high oil consumption, the seal ring between the intake pipe and the throttle actuator may require replacement. To resolve the issue, replace the seal between the intake pipe and throttle actuator with new ….
Tech Tip: Steering Position and Yaw
The Electronic Stability Control (ESC) program uses the Anti-Lock Brake System (ABS) and Electronic Throttle Control (ETC) to maintain vehicle stability in a cornering maneuver. The ESC program requires the communication between the Engine Control Module (ECM) and ABS controller. This communication takes place on the Controlled Area Network (CAN) buss of the vehicle. The program uses input from the following sensors: steering wheel position, throttle pedal position, throttle position, engine speed, brake switch, wheel speed, yaw and ….