Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN2003PASSAT SEDAN (3B3) V6-2.8L (ATQ)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)LOCATIONSFUEL INJECTION, SERVICING
2003 Volkswagen Passat Sedan (3B3) V6-2.8L (ATQ)
Fuel Injection, Servicing
2003 Volkswagen Passat Sedan (3B3) V6-2.8L (ATQ)SECTION Fuel Injection, Servicing
Fuel injection, servicing
Component locations, overview
Note: The overview of component locations shows the following components:
EPC indicator lamp for electronic gas activations
Brake lights switch -F- and brake pedal switch -F47-
Throttle position (TP) sensor -G79- and sender for 2 accelerator pedal poaition.
1. Harness connector
4-pin connector, green
For O2S behind TWC -G130- and O2S heater -Z29-
For bank 1
2. Harness connector
4-pin connector, brown
For O2S 2 behind TWC -G131- and O2S heater -Z30-
For bank 2
3. Harness connector
4-pin connector, black
For HO2S -G39- before TWC and O2S heater -Z19-
For bank 1
4. Harness connector
3-pin connector, brown
For Knock Sensor (KS) 1 -G61-, bank 1
5. Engine - Coolant Temperature (ECT) sensor -G62-
6. Secondary Air Injection (AIR) solenoid valve -N112-
7. Intake Air - Temperature (IAT) sensor -G42-
8. Intake Manifold Change-Over Valve -N156-
9. Throttle valve control module -J338-
10. Harness connector
4-pin connector, black
For HO2S 2 -G108- before TWC and O2S heater -Z28-
Bank 2
11. Harness connector
3-pin connector, brown
For Knock Sensor (KS) 2 -G66-, bank 2
12. Harness connector
3-pin connector, gray
For Engine Speed (RPM) sensor -G28-
13. Engine Control Module (ECM) -J220-
Location in protective housing in, radiator tank on left
14. Fuel pressure regulator
15. Camshaft Position (CMP) sensor 2 -G163-
cylinder bank 2
16. Heated Oxygen Sensor (HO2S) 2 -G108-
Tightening torque: 50 Nm (37 ft lb)
Before TWC, cylinder bank 2
17. Engine Speed (RPM) sensor -G28-
18. Knock Sensor (KS) 2 -G66-
Cylinder bank 2
19. Valve -2- for camshaft adjustment -N208-
Cylinder bank 2
20. Ignition coils -N-, -N128-, -N158-
With power output stage -N122-
21. Knock Sensor (KS) 1 -G61-
Cylinder bank 1
22. Fuel injectors -N30-, -N33-, -N83-, -N84-
23. Camshaft Position (CMP) sensor -G40-
Cylinder bank 1
24. Ground connection
On engine support, right
25. Heated Oxygen Sensor (HO2S) -G39-
Tightening torque: 50 Nm (37 ft lb)
Before TWC, cylinder bank 1
26. Valve-1- for camshaft adjustment -N205-
Cylinder bank 1
27. Secondary Air Injection (AIR) pump motor - V101-
28. Mass Air Flow (MAF) sensor -G70-
29. Evaporative - Emission (EVAP) canister purge regulator valve -N80-
On air cleaner
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.