35 replies to this topic

[mwitacharles]

Thanks alot acres!!!!!!!!!!! will go and check it out and report back.

[mwitacharles]

So i did go through the wiring and found nothing wrong at all!!! however the signal to the solenoid in the wing was not blinking like the signal to the solenoid in the black box!!! was wondering if they are supposed to be the same? I used a tester with a bulb to see the signal current and how it was behaving. any ideas or suggestions anyone!!!????

[mwitacharles]

could this be an earthing problem? anyone?!!!!

[tmh983]

possible, but i would think it would be affecting more than just that if it were an earth problem.
when u say 'the signal in the black box', what exactly do u mean? there is many different solenoids in the black box, some are simple on/off, others are pwm duty solenoids.

also, i think gen 2's have an additional wastegate, and i assume, an additional wastegate solenoid? maybe the error code is refering to the 2ndry solenoid?

[mwitacharles]

Sorry bout that. I mean the wastegate solenoid in the black box. The signal from the ecu going to that solenoid. I really don't knw what to do next!!! can the ecu be the one causing all this mayhem?

[tmh983]

can you get your hands on a multimeter that can measure frequency and duty cycle?

[mwitacharles]

yes i can get one and have done that already!!!! the wastegate solenoid in the black box clearly has the cycle going but the wastegate solenoid in the wing has a very faint one going. Its very weak!!! I was wondering where the grounding for the solenoids comes from? Is it the ecu or are they grounded to the body?

[tmh983]

the ground will be through the ecu via an output transistor. Its possible this transistor has cooked itself. You could pull the cover off the ecu and see if there is anything obviously burnt.

[tmh983]

here is how the circuit looks inside the ecu. If you were really keen, you should be able to trace it on the actual circuit board, but that would be extremely difficult.
As far as I know, the ecu will check to see that 12V is present on the solenoid output pin when the solenoid is OFF. If it can't see 12V then it should put on the cel. It may also check for 0V when the solenoid is ON, but i'm not sure about that one.
If you turn the car on, and unplug the solenoid, does the cel come on straight away?

[mwitacharles]

Yes the cel comes on almost straight away. Let me check the ecu board for the output transistor and report back my findings.

Thanks alot for your help, its really appreciated.

[tmh983]

the fact the cel comes on straight away tells me that is most likely not a problem with the wiring.
It would probably be the output transistor in the ecu has burnt out, or there is another sensor reading incorrectly to make the ecu think the boost controller is not working properly.
What rpm/boost does the cel normally come up?

[mwitacharles]

it comes up at about 3800 to 4000 rpm and if i push the car past that it will fuel cut and i get both 44 and 66!!!

[tmh983]

what boost pressure does it get to? sounds like its picking up the cel at the start of the twins changeover.
There is another duty solenoid in the black box that controls boost pressure via the ECV during change over. Find this solenoid and check it also.

[mwitacharles]

Hey some positive news!!!!!!! the ecu is fine!!!!! was able to get all the codes cleared from memory without disconnecting the battery which hasnt happened in a while. That atleast confirms to me that the ecu is okay. The issue with the primary wastegate solenoid was wiring which i was able to sort out.

about the boost pressure, I am able to get to 0.5-0.6 bar comfortably but cant seem to go beyond that although i also dont rev past around 6000 rpm! I was also suspecting the duty solenoid in the blackbox because this error only comes when i am just about to enter vod to twin mode! I will have a look at that today and report back. Wish me luck!!!

[tmh983]

so what was the problem with the wiring?

[mwitacharles]

so am back!!!!! had gone out of town for a while. the wiring problem was the wires to the solenoid had been interchanged.

can a MBC sort this problem out?