WIS 54.21 Control Units/Modules: Difference between revisions
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==SAM (Signal Acquisition Module)== | |||
A SAM (Signal Acquisition Module) functions much as a network router does on a computer or communications network. It monitors input from various switches, controls, monitoring devices, and warning systems. When you push a button on, for example, your dashboard, the signal goes through a SAM before the device you are controlling responds. If there is something wrong with the device you are trying to operate, you will likely then get a warning, delivered through the SAM to the CAN (Controller Area Network) bus. | A SAM (Signal Acquisition Module) functions much as a network router does on a computer or communications network. It monitors input from various switches, controls, monitoring devices, and warning systems. When you push a button on, for example, your dashboard, the signal goes through a SAM before the device you are controlling responds. If there is something wrong with the device you are trying to operate, you will likely then get a warning, delivered through the SAM to the CAN (Controller Area Network) bus. | ||
==Fault Error Codes/Diagnostic Trouble Codes (DTC)== | |||
===DTC Structure=== | |||
http://w220.ee/images/e/e5/Fault_Error_Codes_or_Diagnostic_Trouble_Codes_Structure.JPG | |||
===DTC Example=== | |||
'''P0420 Catalyst System Efficiency Below Threshold (Bank 1)''' | |||
* 1st digit: (P) Indicates which system reported the fault. | |||
** B = Body, | |||
** C = Chassis, | |||
** P = Powertrain, | |||
** U = Network eg CAN | |||
* 2nd digit (0) Indicated type of fault code. | |||
** 0 = Standardized eg OBD Code | |||
** 1 = Manufacturer Code | |||
* 3rd digit (4) Indicated the assembly where the fault occurred. | |||
** 1 = Fuel and airflow monitoring | |||
** 2 = Injection nozzles | |||
** 3 = Ignition system and combustion misfiring | |||
** 4 = Additional systems for emissions reduction | |||
** 5 = Idle and vehicle speed | |||
** 6 = Onboard computer and other outputs | |||
** 7 = Transmission | |||
** 8 = Transmission | |||
* 4th digit (20) Indicated faulty component and type of fault. | |||
===List of DTC=== | |||
Downloadable pdf files. | |||
http://www.benzworld.org/forums/w220-s-class/1639927-guide-mercedes-benz-vehicle-data-card.html | |||
Revision as of 09:33, 11 March 2015
SAM (Signal Acquisition Module)
A SAM (Signal Acquisition Module) functions much as a network router does on a computer or communications network. It monitors input from various switches, controls, monitoring devices, and warning systems. When you push a button on, for example, your dashboard, the signal goes through a SAM before the device you are controlling responds. If there is something wrong with the device you are trying to operate, you will likely then get a warning, delivered through the SAM to the CAN (Controller Area Network) bus.
Fault Error Codes/Diagnostic Trouble Codes (DTC)
DTC Structure
DTC Example
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
- 1st digit: (P) Indicates which system reported the fault.
- B = Body,
- C = Chassis,
- P = Powertrain,
- U = Network eg CAN
- 2nd digit (0) Indicated type of fault code.
- 0 = Standardized eg OBD Code
- 1 = Manufacturer Code
- 3rd digit (4) Indicated the assembly where the fault occurred.
- 1 = Fuel and airflow monitoring
- 2 = Injection nozzles
- 3 = Ignition system and combustion misfiring
- 4 = Additional systems for emissions reduction
- 5 = Idle and vehicle speed
- 6 = Onboard computer and other outputs
- 7 = Transmission
- 8 = Transmission
- 4th digit (20) Indicated faulty component and type of fault.
List of DTC
Downloadable pdf files.
http://www.benzworld.org/forums/w220-s-class/1639927-guide-mercedes-benz-vehicle-data-card.html