Question about 1992 GMC Typhoon

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I think the wastegate is staying open when it gets warmed up is that possible

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Wastegate should be open if waste gate closed it will cause engine to overboost destroy engine.

Posted on Jul 18, 2013

Testimonial: "its supposed to open and close to create boost when cold creates bout 16lbs boost when hot boost goes away like the wastegate staying open"

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Turbo not kicking in like it should cant find no leaking pipe and turbo seems to be working fine


In general the possible causes could be:
- Boost pressure sensor harness is open or shorted
- Boost pressure sensor circuit poor electrical connection
- Faulty boost pressure sensor
- Faulty Turbo/Super Charger
- Engine over temperature.
- Ignition misfire exceeds the calibrated threshold.
- Faulty Knock sensor (KS)

I would doubt its the turbo as you said it seems to be working just fine (unless the wastegate is stuck open/wastegate seal is cracked). Also if the ignition misfire exceeds the claibrated threshold then I would think you'd hear that in the engine running normally. I would say locate the sensor and replace it?

Hope this helps

Dec 05, 2012 | Cars & Trucks

2 Answers

Jeep grand cherokee 2.7 crd I have a problem about code p0243 thans for your help.


DTC P0243 - Turbo/Super Charger Wastegate Solenoid A
Description: Open or shorted condition detected in the turbocharger wastegate solenoid control circuit.


Here is the flow chart for that code (some images could need to clicking for zoom)...

P0243-WASTEGATE PRESSURE CONTROL PWM

zjlimited_337.gif

For a complete wiring diagram Refer to Section 8W.

When Monitored: When the ignition is on.
Set Condition: The ECM detects an open or short circuit in the Wastegate solenoid circuit.

Possible Causes
DAMAGED WIRING HARNESS OR CONNECTORS
WASTEGATE SOLENOID
(F504) FUSED IGNITION SWITCH OUTPUT OPEN
(K139) WASTEGATE SOLENOID DRIVER CIRCUIT OPEN
(K139) WASTEGATE SOLENOID CIRCUIT SHORTED TO GROUND
(K139) WASTEGATE SOLENOID DRIVER SHORTED TO VOLTAGE
(K139) WASTEGATE SOLENOID DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT
ECM
INTERMITTENT CONDITION

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Diagnostic Test
1. DAMAGED WIRING HARNESS OR CONNECTORS

zjlimited_338.gif

Turn Ignition off.
Disconnect the ECM harness connectors.
Disconnect the Wastegate Solenoid harness connector.

NOTE: Check connectors - Clean/repair as necessary.


Are any wires or pins damaged?

Yes
Repair or replace any damaged wire or connectors.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

No
Go To 2


2. WASTEGATE SOLENOID

zjlimited_339.gif

Reconnect the ECM harness connector.
Reconnect the disconnected Wastegate Solenoid harness connector.
Turn the Ignition on, engine not running.
Disconnect the Wastegate Solenoid harness connector.
Connect an incandescent test light across the supply and driver pins at the Wastegate Solenoid harness connector.

NOTE: The ECM will perform a self check of the circuit after approximately 30 seconds, which should light the incandescent test light.


Does the light illuminate brightly after 30 seconds of being connected?

Yes
Replace the Wastegate Solenoid.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

No
Go To 3


3. (F504) FUSED IGNITION SWITCH OUTPUT OPEN

zjlimited_340.gif

Connect an test light between the Wastegate Solenoid connector Fused ignition switch output circuit and battery negative.
Compare the test light brightness to that of a direct connection to the battery.

Does the light illuminate brightly?
Yes
Go To 4

No
Repair the open (F504) Fused Ignition switch output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).



4. (K139) WASTEGATE SOLENOID DRIVER CIRCUIT OPEN

zjlimited_341.gif

Disconnect the ECM harness connectors.
Measure the resistance of the Wastegate Solenoid driver circuit between the Wastegate Solenoid harness connector and the ECM harness connector.

Is the resistance less than 10 Ohms?
Yes
Go To 5

No
Repair the open (K139) Wastegate Solenoid control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).


5. (K139) WASTEGATE SOLENOID CIRCUIT SHORTED TO GROUND

zjlimited_343.gif

Measure the resistance of the (K139) Wastegate Solenoid driver circuit between the Wastegate Solenoid harness connector and battery negative.

Is the resistance less than 10 Ohms?
Yes
Repair the (K139) Wastegate solenoid circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

No
Go To 6


6. (K139) WASTEGATE SOLENOID DRIVER SHORTED TO VOLTAGE

zjlimited_344.gif

Measure the voltage between the (K139) Wastegate Solenoid driver circuit at the Wastegate Solenoid connector and battery negative.

Is the voltage less than 1 volt?
Yes
Go To 7

No
Repair the (K139) Wastegate solenoid driver shorted to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).


7. (K139) WASTEGATE SOLENOID DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT

zjlimited_345.gif

Measure the resistance between the (K139) Wastegate Solenoid driver circuit in the ECM harness connector and all other circuits in the ECM harness connectors.

Is the resistance less than 10 Ohms?
Yes
Repair the (K139) Wastegate solenoid circuit shorted to another circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)


No
Go To8


8. WASTEGATE SOLENOID

zjlimited_346.gif
Reconnect the ECM harness connector.
Reconnect the disconnected Wastegate Solenoid harness connector.
Turn the Ignition on, engine not running.
Disconnect the Wastegate Solenoid harness connector.
Connect an incandescent test light across the supply and driver pins at the Wastegate Solenoid harness connector.

NOTE: The ECM will perform a self check of the circuit after approximately 30 seconds, which should light the incandescent test light.


Does the light illuminate brightly after 30 seconds of being connected?
Yes
Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).

No
Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

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Keep us updates.

May 04, 2011 | 2003 Jeep Grand Cherokee

1 Answer

I got a 1994 dodge intrepid and I have 2 codes up on it and i dont know what they are. Code 35 and 45?


Fault Code 35
Description: Radiator fan relay circuit is open or shorted
Power loss light: Off
Limp-in mode: None

Possible Causes:
Bad connection or wiring - Check the wiring and connections between the logic module and the relay. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

Bad relay - Disconnect the relay and apply 12V across the coil terminals (between the white wire and either of the other two terminals on the small connector). You should hear a click for either of the two termials and the connection between the grey wire and the other two terminals of the large connector should be shorted.

Diagnostic Method
Trigger Parameters
- Near 0V or near 12V not detected when the relay is turned on or off, respectively
Results If Component Fails
Fault code 35 is stored.


Fault Code 45
Notes: For Turbo models only

Description: Turbo boost limit exceeded
Power loss light: On
Limp-in mode: None

Possible Causes
Vaccum leak - Check all vaccum lines between the wastegate actuator, manifold, and wastegate solenoid. Also check the line to the MAP sensor. Repair or replace any bad lines.

Wastegate solenoid failure - The wastegate solenoid is located in the right, front fender next to one to three other solenoids. See the Understanding Solenoids page.

Bad connection or wiring - Check the wiring and connections between the logic modle (or SMEC) and the wastegate solenoid. Clean and regrease any corroded connectors with dielectric grease and repair any shorts. This condition may be accompanied by a code 36.

Wastegate actuator spring failure - Try to slide the wastegate to wastegate actuator push rod into the actuator. It should not move. Try to pull it out. If it pulls out with little effort (even if it springs back in), replace the actuator.

Jammed wastegate - Disconnect the wastegate actuator pushrod and swing the wastegate arm on top of the turbo. It should have about a 50 degree swing. Make sure the lever and push rod are clear of any obsticles that may cause them to jam (the heat shield below the fuel rail is a major culprit).

Diagnostic Method
Trigger Parameters
- MAP sensor output voltage has exceeded overboost cut-off point

zjlimited_942.jpg

Following years are probably the same as 1987, but I don't have any hard data to back that up. Some have said that 4.74V was the max for Turbo I engines of later years. Some information indicates that the Turbo II with an automatic had a cut-off of 4.96V, but I don't know of any Turbo II vehicle that had an automatic transmission.

Results If Component Fails
A fault code 45 is stored, the power loss light is turned on, and the fuel injectors are shut off. Once the boost has fallen to 3 psi to 5 psi, the fuel injectors are turned back on and the power loss light is turned off. The overboost cut-off point for a particular vehicle depends on the year, engine, and transmission.


Keep us updated.

Mar 29, 2011 | 1994 Dodge Intrepid

1 Answer

What is a wastegate on 2004 dodge 5.9L cummins diesel?


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.

Mar 10, 2010 | 2004 Dodge Ram 2500

1 Answer

No spool and wastegate wont open


I dont think anyone can hear the wastegate open. It opens when there is overboost and just routes exhaust around the turbo You may have heard the over boost valve open and release pressure., but normally, it doesnt open unless there is a problem with the waste gate. Its like a back up in case the waste gate is bad, or disconnected. Does the engine have the same amount of power as it always has? If so everything should be OK.

Nov 02, 2009 | 2007 Mazda Speed 6 Sedan

1 Answer

No power and rough running when throttle pushed


if the waste gste is staying open u must be boosting to much most proberly causing lack of fuel

Oct 05, 2009 | Mazda MX-5 Miata Cars & Trucks

1 Answer

My Saab 9-3 turbo wastegate seems to be stuck open. Pressure builds but will not kick on the turbo. Suggestions?


I think the actual problem may be generic to Saabs of the same age. So maybe this information will help many others

Yes the turbo was faulty but no it was simple to fix and did not cost me a lot.

the wastegate ( a valve which is opened to switch on the turbo) is driven by a vacuum actuator - and the actuator leaver arm which connects to the wastegate to the actuator had fallen off.

So The wastegate valve was stuck semi open up and never moved.

This does not directly show any engine error or cause any emissions
problems, as the car passed an a mot before immediately before the fault was found.

My local garage man did the work needed in 2.5 hours on the ramp and did not have to take much too bits to make a good repair.

Car goes like a train, and the engine management light - which was coming on at odd times has since stayed off.

I suspect that the management light which was coming on due to emissions sensors -- triggered by some series of events which cause the emmision to go out out of line, due to the turbo not fully working.

Jul 04, 2009 | 1997 Saab 900

1 Answer

I have a 1998 WRX and it won't boost over 5psi?


You most likely have a problem with the wastegate staying open and bleeding off all the 'boost' because your vaccum lines are incorrectly installed. The vaccume line leading to the wastegate must have sufficiant pressure to keep the wastegate shut until the desired 'boost' level has been met.

Apr 06, 2009 | 2007 Subaru Impreza WRX STI Limited Sedan

1 Answer

Turbo doesnt engage


The turbo never "engages". The turbo spins all the time, but the amount of exhaust gas driving it is adjusted by the wastegate.

The problem you are experiencing could be due to the wastegate's vacuum tube being disconnected. The wastegate is meant to open as the inlet manifold pressure increases, so that the turbo spins less and doesn't compress the air too much. It could also be the result of a faulty sensor, but check the vacuum tubes first. Your wastegate actuator is fitted just behind the turbo. If the pipe has come off recently, you should be able to see a clean section where it's meant to be joined to the actuator. The disconnected pipe should be fairly close by. Again, the pipe should be connected to the inlet manifold though from memory I think this is one of the difficult to reach pipes on the back of the engine.

As a side note, the turbo guage on the dashboard is very poor. Even if only for the sake of diagnostics, you should get a cheap direct vacuum driven guage.

Dec 26, 2008 | 1998 Toyota Celica

1 Answer

Top end power down


Hi,
It sounds like the turbo boost isn't being controlled properly, but this could be due to several things. Check for splits in the air pipework, and then get the N75 valve checked out - this is the item that opens the wastegate on the turbo, effectively shutting the turbo off. Oh, and check that the wastegate actuating lever isn't seized up...
Hope this helps you a bit. D.

Aug 04, 2008 | 2000 Volkswagen Jetta TDI

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