Update!!!

[mattd1979]

I finally pulled the codes to the 1991 Q 45 and here is what I got.

TCS= 18TCM= 13ECCS= 34

It took me a little over 2 hours to get to the computers and retrieve the codes.

For TCS the code is telling me that the operating oil pressure in TCS actuator is abnormal.

Code 13 for TCM is "Secondary throttle valve operating signal circuit."Whatever that means.

Code 34 for ECCS is "Detonation sensor circuit" which it says is open or shorted.

Has anybody else had any of these codes and if so what did you do to fix these issues?

Thanks in advance.

Matt

Jacksonville, FL

[elwesso]

Matt...

I keep feeling like Im blowing you off!!!! Dammit we're gonna get to the bottom of this problem

TCM= 13 ... I think this is what you need to look into.. I remember in your other thread Q45tech said that these do fail sometimes...

Follow the diagnostic procedures in your FSM, there are ways you can tell if your secondary TCS motor is working....

[Q45tech]

The auxillary TPS [potentiometer] tells the TCS ecu the position of the secondary throttle blade which is controlled by the TCU motor. A check on the motor ------feedback of position.

The predicessor of modern drive by wire electronic throttle bodies.

When rear tire slip [spinning] is noted the TCU reduces engine power by choking off the air flow by closing the auxillary throttle plate [which is normally wide open] in front of the main throttle plate [which is controlled by accelerator pedal] ------equivalent of you lifting the main throttle and allowing it to close............the aux TPS just feedbacks a signal to TCU that the motor did what it was told to do..........measures the position of the choking throttle blase [plate].

You are dealing with almost $5,000 at retail parts of complex systems.

Usual non electronic problems show up when owners don't flush brake fluid at regular intervals allowing it to turn amber-brown- black.

Everything you need is in the FSM.

[911/Q45]

Code 34 sounds like a knock sensor, which would involve replacing both of them and the wiring harness to same.

[mattd1979]

Are you saying that it may cost that much to fix these problems?

I can tell you that according to a reciept from Atlantic Infiniti to the original owner is that the owner took the car to the dealer complaining of a buzz sound that comes on and off when the car is first started. Here is what the reciept says word for word. "12/31/03-Client states there is a buzzing noise on and off when car is cold. Unable to duplicate concern. No action taken. Client states traction control and slip light is on. Replaced relays, lights still on. They never fixed the problem. Now this was not the first time she had the relays replaced. She had them replaced back on 9/30/97. So she continued to drive it this way until the day we bought it which was 10/25 I think.

She had called Atlantic Infiniti and requested a list of all of the work that she had done to the car since the owned it which is 12 pages long. If you want I can scan a copy of the page that talks about the TCS and either post it on here if possible or e-mail it to whoever wants to see it.

Thanks for the feedback

MattJacksonville, FL

P.S. elWESso69I went ahead and ordered a set of four Tokiko blues from Southwest and I ordered dust covers for all four struts and the rack bushings and dust boots from Everything Infiniti. I asked for Joe.

[Q45tech]

Only if you had to replace everything could it cost $5,000! Why we buy junk Q for parts. However we use new TCS aux TPS and throttle motors.

The buzzing was probably the TCS auxillary pressure pump coming on.Since TCS applies rear brakes, the TCS must have an accumulation of brake fluid pressure to use since driver doesn't apply the brakes.The whole TCS circuit is after the ABS rear line which is then split into two paths , one for each rear brake caliper.

The reason the under battery relays get replaced is usually battery acid over flow from a cracked retainer tray caused by an improper aftermarket battery [wrong physical size] and the installtion of same flopping around [improperly restrained].

You must read the REAL TCS code via the Consult to start the diagnostic proceedure............usually a bad wheel sensor, bad aux TPS, bad aux motor.Probably less than $1500 [worst case] to repair assuming a mix of used and new parts.

[mattd1979]

Infiniti replaced the relays and still could not determine why the TCS light and the slip light would not go out and left the customer with the problem still not resolved. The pump cuts on and off about 7 times and as soon as it goes out the lights come on. It almost sounds like the motor is overheating and an internal breaker kicks out.

Matt

[mattd1979]

I took the car to the dealer and had it tested. The results are that the complete harness needs to be replaced do to corrosion and that it will cost $4000 for the part and $1500 to install it.

[Q451990]

Which harness? Seems like anything can be repaired in some manner. A used harness might be an option. It might make sense to find one on a parts car somewhere that a member is parting out. Finding one that hasn't been chopped up in a salvage yard may be difficult.

Heath

[Q451990]

I just noticed that you're in Jacksonville. I would recommend taking the trip to T3 in Atlanta. They may be able to repair whatever is wrong, or offer you an alternative from one of their "dead line" parts cars. It will be well worth the drive to get this diagnosed correctly - and they're more comfortable working with used parts and making repairs on existing parts vs. dealerships.

Heath

[DAEDALUS]

$4000 for the part? Or $400? I once priced the Q45 main engine harness from Joe at $5-600 I think. Corrosion only happens at the connectors. The labor in a good splice job would probably offset the labor required to install a new harness.

[mattd1979]

The rep said it would be $4000 for the part and $1500 for labor because he said that they will have to take out all of the interior to replace the harness. He also said that all of the above codes are caused from the corrosion in the harness.

[elwesso]

I mirror heaths advice... Goto T3.....!!!

[Q45tech]

404-794-7700..........Byron will be off Thanksgiving week and the following Monday.