Component Location Overview

Component Location Overview

Right Side of the Engine Compartment






1 - E-box in Plenum Chamber

• Engine Control Module (ECM) (J623) with height sensor

• Removing and installing, refer to => [ Engine Control Module (J623) ] Service and Repair

2 - Mass Airflow (MAF) Sensor (G70)

• Removing and installing, refer to => [ Mass Airflow Sensor (G70) ] Service and Repair

3 - Camshaft Position (CMP) Sensor (G40)

• Component location, refer to => [ Installation Locations ]

4 - Fuel Temperature Sensor (G81)

• Component location, refer to => [ Installation Location on Cylinder Bank 1 ]

5 - Engine Coolant Temperature (ECT) Sensor (G62)

6 - Plenum Chamber Bulkhead Bracket

• Differential pressure sensor (G505) - adapt after replacing

• Exhaust gas temperature sensor 2 (G448) connector

• Heated Oxygen Sensor (HO2S) (G39) connector with Oxygen Sensor (O2S) heater (Z19)

• Exhaust gas temperature sensor 4 (G648) connector

7 - Fuel Pressure Regulator Valve (N276)

• Cannot be used again

• The adaptation values must be adapted after replacing the high pressure pump or the fuel pressure regulator valve, refer to "Guided Functions" in the vehicle diagnostic tester.

• Removing and installing, refer to => [ Fuel Pressure Regulator Valve (N276) ] Service and Repair

8 - Exhaust Gas Recirculation (EGR) Temperature Sensor (G98) Connector

9 - Exhaust Gas Temperature Sensor 1 (G235) Connector

10 - Turbocharger Control Module 1 (J724)

11 - Intake Flap Motor (V157)

• Cylinder bank 1

• Intake manifold assembly overview, refer to => [ Intake Manifold Overview ] Intake Manifold Overview

12 - Fuel High Pressure Pump

• High pressure pump assembly overview, refer to => [ High Pressure Pump Overview ] Service and Repair

• Removing and installing, refer to => [ High Pressure Pump ] High Pressure Pump

13 - Fuel Metering Valve (N290)

14 - Reduced Oil Pressure Switch (F378)

15 - Exhaust Gas Recirculation (EGR) Cooler Pump (V400)

16 - Pressure Retaining Valve or Restrictor in the Fuel Return Line

• The type of component that was installed is dependent upon the model year

• The check valve always maintains a residual pressure (control quantity) of approximately 10 bar (145 psi) in the fuel return lines.

• The restrictor always maintains a residual pressure (control quantity) of approximately 4 bar in the fuel return lines.

• The Piezo injectors need this control quantity for their function.

• The check valve or the restrictor can be replaced only with the complete fuel return lines.

• Bleed the fuel system after replacing, refer to => [ Fuel Tank, Filling with Fuel after Installing High Pressure Pump ] General Information

• Check pressure retaining valve => [ Fuel Return Check Valve, Checking ] Fuel Return Check Valve, Checking

• Check the restrictor, refer to => [ Restrictor in the Fuel Return Line, Checking ] Restrictor In the Fuel Return Line, Checking

17 - Injection Units (Piezo injectors)

• Cylinder Bank 1

• Removing and installing, refer to => [ Fuel Injectors ] Fuel Injectors

18 - Engine Coolant Temperature (ECT) Sensor on Radiator Outlet (G83)

Left Side of the Engine Compartment

Component A through N are not shown in the exploded view.






1 - Fuel High Pressure Pump

• With fuel metering valve (N290)

• High pressure pump assembly overview, refer to => [ High Pressure Pump Overview ] Service and Repair

• Removing and installing, refer to => [ High Pressure Pump ] High Pressure Pump

2 - Exhaust Gas Recirculation (EGR) Motor (V338)

3 - Exhaust Gas Recirculation (EGR) Cooler Switch-Over Valve (N345)

4 - EGR Temperature Sensor (G98)

5 - Intake Flap Motor 2 (V275)

• Cylinder bank 2

• Intake manifold assembly overview, refer to => [ Engine Control Module (J623) ] Service and Repair

6 - Installation Location Inside the Exhaust System

• Heated Oxygen Sensor (HO2S) (G39) with Oxygen Sensor (O2S) Heater (Z19)

• NOx sensor (G295)

• Exhaust gas temperature sensor 2 (G448)

• Catalyst temperature sensor 1 (G20) (engine code CATA, not installed in all vehicles)

• Exhaust Gas Temperature (EGT) Sensor 3 (G495)

7 - Catalyst Temperature Sensor 1 (G20) Connector

8 - Exhaust Gas Temperature (EGT) Sensor 3 (G495) Connector

9 - Auxiliary Fuel Pump (V393)

• The auxiliary fuel pump is discontinued starting with MY 11.

10 - Fuel Cooler

11 - Fuel Filter

12 - NOx Sensor (G295)

• Removing and installing, refer to => [ NOx Sensor (G295) ] NOx Sensor (G295)

13 - Throttle Valve Control Module (J338)

14 - Injection Units (Piezo injectors)

• Cylinder Bank 2

• Removing and installing, refer to => [ Fuel Injectors ] Fuel Injectors

15 - Charge Air Pressure Sensor (G31) with Intake Air Temperature (IAT) Sensor (G42)

16 - Fuel Pressure Sensor (G247)

• Removing and installing, refer to => [ Fuel Pressure Sensor (G247) ] Service and Repair

17 - Oil Pressure Control

• Oil pressure switch (F22)

• Oil pressure regulation valve (N428)

A - Brake Lamp Switch (F) and Brake Pedal Switch (F47)

• In footwell at brake pedal

B - Accelerator Pedal Position Sensor (G79) and Accelerator Pedal Position Sensor 2 (G185)

• In footwell, at accelerator pedal

• After replacing, the kick-down switch on the vehicles with automatic transmission must be re-adapted.

• Adapting the kick-down, see Guided Fault Finding.

C - Starter Relay (J53) and Relay 2 for Starter (J695)

D - Automatic Glow Time Control Module (J179)

E - Terminal 30 Power Supply Relay (J317)

F - Terminal 15 Power Supply Relay (J329)

G - Engine Speed (RPM) Sensor (G28)

• In the transmission housing above the starter ring gear

H - Glow Plugs

• Glow Plug 1 (Q10)

• Glow plug 2 (Q11) with cylinder 2 combustion chamber pressure sensor (G678) (single component)

• Glow Plug 3 (Q12)

• Glow Plug 4 (Q13)

• Glow plug 5 (Q14) with cylinder 5 combustion chamber pressure sensor (G681) (single component)

• Glow Plug 6 (Q15)

• Removing and installing, refer to => [ Glow Plugs ] Service and Repair

I - Exhaust Gas Temperature (EGT) Sensor 1 (G235)

J - Exhaust Gas Temperature (EGT) Sensor 4 (G648)

K - NOx Sensor 2 (G687)

• Removing and installing, refer to => [ NOx Sensor 2 (G687) ] NOx Sensor 2 (G687)

L - Reducing Agent Injector (N474)

M - Fuel Pump Control Module (J538)

• Only on vehicles from MY 11

N - Particulate Filter

• Installed on the underbody

• Shared component with a catalytic converter

• After replacing the particulate filter, perform an adaptation on the Engine Control Module (ECM)

An adaptation must be performed after replacing the differential pressure sensor (G505) and/or particulate filter.

Engine Coolant Temperature (ECT) Sensor on Radiator Outlet (G83) - 2 -





Engine Coolant Temperature (ECT) Sensor (G62) - 1 -





Fuel Filter





1 Auxiliary fuel pump (V393)
2 Auxiliary fuel pump connector
3 Fuel supply line via the auxiliary fuel pump to the fuel high pressure pump
4 Fuel return line to the fuel cooler
5 Fuel cooler
6 Fuel filter
7 Fuel supply line from the fuel tank
8 Fuel return line from the high pressure pump
9 Fuel return line to the fuel tank

• The auxiliary fuel pump is discontinued starting with MY 11.

Installation Locations





1 Camshaft Position (CMP) sensor (G40)
2 Fuel pressure regulator valve (N276)

Installation Location on Cylinder Bank 1





1 Fuel pressure regulator valve (N276)
2 Fuel temperature sensor (G81)
3 Pressure retaining valve or restrictor in the fuel return line

Installation Locations





1 Exhaust Gas Recirculation (EGR) temperature sensor (G98) connector
2 Exhaust gas temperature sensor 1 (G235) connector
3 Not installed in this location
4 EGR Cooler Switch-Over Valve (N345)
5 EGR temperature sensor (G98)
6 EGR motor (V338)

EGR Cooler Switch-Over Valve 2 (N381) - 3 -





EGR Cooler Pump (V400) - 1 -





Reduced Oil Pressure Switch (F378) - 1 -





Oil Pressure Control





1 Oil pressure switch (F22)
2 Oil pressure regulation valve (N428)

Fuel Pressure Sensor (G247) - 1 - on Cylinder Bank 2





Engine Speed (RPM) Sensor (G28) Connector - arrow -





High Pressure Pump





1 Fuel supply line to the high pressure pump
2 Fuel return line to the fuel tank
3 High pressure fuel line to fuel rail (cylinder bank 1)
4 High pressure pump, removing and installing, refer to => [ High Pressure Pump ] High Pressure Pump
5 Fuel metering valve (N290)

Charge Air Pressure Sensor (G31) with Intake Air Temperature Sensor (G42) - 2 -





Installation Location Inside the Exhaust System Tract





1 Exhaust Gas Temperature (EGT) Sensor 3 (G495)
2 Catalyst temperature sensor 1 (G20) (engine code CATA, not installed in all vehicles)
3 EGT sensor 2 (G448)
4 NOx sensor (G295)
5 Heated Oxygen Sensor (G39) with Oxygen Sensor Heater (Z19) , removing and installing, refer to => [ Heated Oxygen Sensor (G39) with Oxygen Sensor Heater (Z19) ] Service and Repair.

Electrical Connectors





1 For the catalyst temperature sensor l (G20)
2 For the exhaust gas temperature sensor 3 (G495)

Component Location on the Plenum Chamber Bulkhead





1 EGT sensor 2 (G448) connector (engine code CATA)
2 Heated Oxygen Sensor (HO2S) (G39) connector with Oxygen Sensor (O2S) heater (Z19)
3 Differential pressure sensor (G505)
4 EGT sensor 4 (G648) connector

EGT Sensor 4 (G648) - arrow -





NOx Sensor (G295)





1 NOx sensor connector

Reducing Agent Injector (N474) - 4 -





EGT Sensor 1 (G235) - arrow -