Ford Edge Turbocharger

There are several possible reasons why the turbo on your 2002 Golf TDI might not be engaging:

1. Boost pressure issue: The most common cause of a non-engaging turbo is a boost pressure issue. This can be caused by a leak in the intake system, a damaged turbocharger, or a clogged air filter.
2. Malfunctioning wastegate: The wastegate is a component that controls the amount of exhaust gas that flows through the turbocharger. If the wastegate is malfunctioning, it may not allow the turbo to engage properly.
3. Faulty turbocharger control solenoid: The turbocharger control solenoid is responsible for regulating the amount of pressure that goes to the turbocharger. If the solenoid is faulty, it may not be able to control the pressure properly, leading to a non-engaging turbo.
4. Electrical issue: There may be an issue with the electrical components of the turbo system, such as a faulty wiring harness, sensor or control module.

To diagnose the problem, you can check for any visible leaks in the intake system or damage to the turbocharger. You can also check the wastegate for proper function and inspect the turbocharger control solenoid for any signs of damage or failure. If you are unsure how to perform these checks, it is recommended to take your vehicle to a qualified mechanic for a proper diagnosis and repair.

Some 2012-2013 Ford Edge and Explorer vehicles equipped with the 2.0L GTDI (gasoline turbocharged direct injection) engine may exhibit DTC P1015 or P1016.
1. Inspect all hoses routed to the turbocharger wastegate regulating valve solenoid for disconnection or damage. Repair as needed.
2. If no hose problem is found, replace the turbocharger wastegate regulating valve solenoid. Torque the two 8 mm retaining bolts to 90 in.-lbs. If equipped, remove the shield covering the filter and discard.
The new turbocharger wastegate regulating valve solenoid is available as P/N CB5Z-9E882-A.

the following answer is courtsey of OBD-CODES.com OBD Codes Your OBD-II Trouble Codes Repair Site Home Trouble Codes FAQs Forums Store P0299 Turbo / Supercharger Underboost OBD-II Trouble Code Technical Description Turbocharger/Supercharger "A" Underboost Condition What does that mean? The P0299 DTC code refers to a condition where the PCM/ECM (powertrain/engine control module) has detected that the bank "A" or single turbocharger or supercharger is not providing a normal amount of boost. That could be due to a variety of reasons, which we detail below. On a normally operating turbocharged or supercharged engine the air going into the engine is pressurized and that's part of what makes so much power for an engine of it's size. If this code is set, you will likely notice reduced power output. In the case of Ford vehicles, this may apply: "The PCM checks for a minimum throttle intake pressure (TIP) PID reading during engine operation, which indicates an underboost condition. This DTC sets when the PCM detects that the actual throttle intake pressure is less than the desired throttle intake pressure by 4 psi or more for 5 seconds." Symptoms Symptoms of a P0299 DTC may include: MIL (Malfunction indicator lamp) illumination Reduced power output from engine, possibly in a limp mode Unusual sounds from the engine/turbo There would likely be no other symptoms. Potential Causes Potential causes of a P0299 turbo underboost code include: Intake (induction) air restriction or leak Failed or damaged turbocharger (sticking, binding, etc.) Faulty boost/charge pressure sensor Faulty wastegate bypass regulator valve (VW) Low fuel pressure condition (Isuzu) Sticking turbo nozzle control solenoid (Isuzu) Faulty injector control pressure (ICP) sensor (Ford) Low oil pressure (Ford) EGR system fault (Ford) Variable geometry turbocharger (VGT) actuator (Ford) VGT vanes sticking (Ford) Possible Solutions First off, you'll want to repair any other DTC codes if present prior to diagnosing this code. Start with a visual inspection. Inspect the intake air system for cracks, loose or disconnected hoses, restrictions, blockages, etc. Repair or replace as required. If the air induction system tests OK, then you'll want to focus your diagnosis efforts on the charge pressure control, diverter valve (blowoff valve), sensors, regulators, etc. Really at this point you'll want to refer to a vehicle specific detailed repair manual for specific troubleshooting steps. There are some known issues on certain makes and engines so also check out our car repair forums here and search using your keywords. For example, if you search around, you'll find that a common fix for a P0299 in VWs is to replace or repair the diverter valve or wastegate solenoid. On the GM Duramax diesel, this code may mean the turbo housing resonator has failed. If you have a Ford, you'll want to next check the wastegate regulating valve solenoid for correct operation

Read more at: http://www.obd-codes.com/p0299
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Trouble Code: P1557

Charge Pressure Control Positive Deviation

Possible Causes:


Charge air system leaks.Recirculating valve for turbocharger is faulty.Turbocharging system is damaged.Vacuum diaphragm for turbocharger needs adjusting.Wastegate bypass regulator valve is faulty.ECM has failed.Here's the causes for the code.

If you do not know the location of the wastegate solenoid, how could you have properly tested it? Then, if you have not properly tested it, how could you possibly know that it actually needs to be replaced? - (just asking to provoke thought)

Hint: If you are getting a fault code that says "turbocharger wastegate solenoid control circuit" (like maybe a P0243), it would be wise to check the circuit before just throwing parts at the car...the solenoid might not be the problem.

With all that said, the answer to your question is that it is on the other end of the vacuum hose that goes to the waste gate valve - top rear of the engine above the left valve cover.

code p35 turbocharger wastegate regulating valve circuit high.this code for a 5.9 DSL 24V TURBO ENGINE.

12 Recently disconnected the battery (always stored)
55 End test.

CODE 31... depending on the model, code 31 can refer to two different systems. Please choose from one of the above links for specific information on each system.

Wastegate Solenoid Circuit Error
The ECM regulates turbocharger boost by opening and closing the "wastegate" as necessary. (The wastegate is a vacuum operated bypass valve that limits the ability of the turbo to provide boost.) The Wastegate Solenoid regulates the vacuum supply to the wastegate for proper operation.

Fault Code Description

• 31 - Wastegate Solenoid circuit error

Symptoms

• Lack of power or engine "ping" due to overboost by the turbocharger
  

Common Problems

• The wastegate solenoid would be the most common cause for code 31 to set
• Code 31 does not indicate a problem with the turbocharger or wastegate

Gear Position Switch (PRNDL) Error The Gear Position switch tells the ECM which position the shifter is in. The ECM will use this information to inhibit starter operation, change the transmission shift pattern as necessary, and provide the information for the electronic shift indicator display on the dash.

Fault Code Description

• 31 - Gear Position switch (PRNDL) error

Symptoms

• Engine may not crank over in Park or Neutral
• Electronic shift indicator may flash

Common Problems
A maladjusted or failed Gear Position switch would be the most common cause for a code 31


Hope helps with this (remember rated this post).

The wastegate is a valve that regulates the ammount of boost that you turbocharger produces. The wastegate opens to release boost pressure.
This valve is electronicly controlled based on inputs to the onboard computer.

It is probably either the N75 valve(Diverter Valve) or the wastegate actuator. Usually a significant boost leak will set a DTC, still check all hoses and clamps.

A bad wastegate actuator or flap would cause no boost but not necessarily the air-sound.

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Testing N75

Air Bypass Valve: Testing and Inspection
With Generic Scan Tool
Wastegate Bypass Regulator Valve, Checking
Recommended special tools and equipment e.g.:
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
Test sequence
- Switch ignition off.
- Disconnect connector at solenoid valve for boost pressure regulation.
- Measure resistance between terminals of valve.
Specified value: 25...35 Ohm
If specified value is not obtained:
- Replace Wastegate Bypass Regulator Valve -N75-.

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Testing N249

Exhaust Bypass Valve: Testing and Inspection
With Generic Scan Tool
Recirculating Valve For Turbocharger, Checking
NOTE: Valve opens between connection to intake manifold and connection to deceleration shut-off valve with no voltage. Connection to vacuum
reservoir is closed.
Test sequence
- Switch ignition off.
- Disconnect connector from Recirculating valve for turbocharger -N249-.

- Measure resistance between terminals of valve.
Specified value: 27...30 Ohm
If specified value is not obtained:
- Replace Recirculating valve for turbocharger -N249-.
If specified values are obtained:
- Connect test box to control module wiring harness, connect test box for wiring test.

- Check wire between test box socket 105+2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
- Also check the wire for short circuit to B+ and Ground (GND).
If no malfunctions are found in wire:
- Check wire between 2-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
If no malfunctions are found in wires:
- Replace Engine Control Module (ECM).

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To test the wastegate, locate the wastegate linkage rod and verify that there is no play and that it is closed. You can apply compressed air to the actuator to see if it opens and closes. (not more than 30 psi)

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Vehicle: Vacuum and Vapor Hose Diagrams
System Diagram
Vacuum Diagram
1 From fuel tank
2 EVAP canister
- with Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-
3 Check-valve for EVAP canister
- Between EVAP canister and intake manifold before turbocharger Installation position (light/dark side): Arrow points in direction of flow, as
shown
4 Turbocharger
5 Pressure unit for boost pressure regulation
6 Mechanical recirculation valve
7 Brake booster
8 Check-valve
- Between brake booster and intake manifold
- Installation position (light/dark side): Arrow points in direction of flow, as shown
9 Wastegate bypass regulator valve -N75-
10 Mass Air Flow (MAF) sensor -G70-
11 Air cleaner housing
12 Pressure control valve for crankshaft housing ventilation
13 Vacuum reservoir
- Bolted on at cylinder head
14 Charge air cooler
- With charge air pressure sensor -G31-
15 Fuel pressure regulator
16 Throttle valve control module -J338-
17 Intake manifold
- With Intake Air Temperature (IAT) sensor -G42-
18 Crankcase ventilation
19 Check-valve
- Installation position (light/dark side): Arrow points in direction of flow, as shown
20 Recirculating valve for turbocharger -N249-
- Component location Fig. 1
21 Check-valve
- Between EVAP canister and intake manifold
- Installation position (light/dark side): Arrow points in direction of flow, as shown
22 Charge air cooler

A wastegate is a valve that diverts exhaust gases away from the turbine wheel in a turbocharged engine system. Diversion of exhaust gases regulates the turbine speed, which in turn regulates the rotating speed of the compressor. The primary function of the wastegate is to regulate the maximum boost pressure in turbocharger systems, to protect the engine and the turbocharger.

It is not really a minor thing. It may not cause a major problem, but you are very likely loosing power and fuel mileage because of it.