Scheme 3. Fuel system of diesel engine before 31.08.2000
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- B17 Intake Air Temperature Sensor
- B28 pressure sensor
- F1 fuse and relay box
- Fn1 fuse 1
- Fn2 fuse 2
- Fn40 fuse 40
- Fn43 fuse 43
- Fn46 fuse 46
- K1/7 engine control unit relay (terminal 30)
- K6 starter relay
- K55 Brake Light Switch Relay
- N₂/2 control unit for belt tensioners and airbags
- N₂/7 airbag control unit
- N3/9 Power Supply Control Unit
- N47-5 ESP control unit
- N54/3 Radio Signal Amplification Unit
- S2 ignition switch
- S9/1 brake light switch
- S40 tempomat
- S40s1 diagnostic connector
- S40s2 speed reduction
- S40s3 speed increase
- S40s4 turning off the temperature control
- S40s5 pin connector
- S40/4 tempomat with speed limiter
- S40/4s1 diagnostic socket
- S40/4s2 speed reduction
- S40/4s3 speed increase
- S40/4s4 turning off the temperature control
- S40/4s5 pin connector
- S40/4s6 speed limiter
- S40/4x1 speed limiter switch
- U24 for manual transmission
- U25 for automatic transmission
- U65 for restraint system without side airbags
- U559 for cruise control
- U592 for side airbag restraint system
- W ground point (-) under the control unit
- X4 terminal 30 (fuse and relay box)
- X26/30 Engine/Instrument Panel Wiring Harness
- X85/10 air conditioner or heater plug
- Y31/4 Secondary air pressure sensor for exhaust gas recirculation
- Y31/5 Boost Air Pressure Sensor
- Z3/26 terminal 15 (without fuse)
- Z7/6 terminal 87
- Z7/9 terminal 87
- Z7/30 terminal 30 (with fuse)
- Z10 wire connection 2
- Z37/2 bus for switching the control units of the powertrain and chassis
- Z37/3 bus for switching the control units of the powertrain and chassis
- Z37/4 data bus for interior instruments
- Z37/5 data bus for interior instruments
- Z51/19 diagnostic connector
- Z80 connector
- Z99/1 terminal 87 (grip system - check The fan motor fuse has blown)
[Information copied from the website mercedesman.ru]