mrsteve

iTrader: (1)

I have 3 codes that read:

Primary O2 Sensor Failure
Lateral G Sensor Failure
ECM relation Failure


WTF is a lateral G sensor failure and an ECM relation failure?

allmotor_2000

The lateral G is one of those codes dealers use to say you 'raced' the car!

derelict

They'd pat us on the back for that...

rbf351

Lateral G sensors

mrsteve

iTrader: (1)

Yes they would.


Unfortunately, Brandon has been promoted to Manager so I have to deal with some no nothing dolt over the phone.


I'm headed there now

mrsteve

iTrader: (1)

The car is at Tischer for the next day to do more diagnosis... ugh... the extended warranty better pick this work up...

dark knight

why did you take it in?

Red Rider

If that's the case, my dealer should never touch my car

scalbert

The lateral G sensor is use with the VSA system to determine what you are doing and intedning on doing. Such as the wheel turned in one direction but the car spinning int he other direction, VSA knows somethign is not correct. The sensor tells the ECU what way the vehicle is travelling.

scalbert

Here is another question, were the codes present without the Unichip??

mrsteve

iTrader: (1)

Yes the codes were present without the UniChip.

EDIT:

Well the CELs were present without the UniChip. The CEL, VSA, and "!" lights all came on at the same time about 30 seconds after I was driving over a bridge at WOT... while crossing the bridge I went over a steel joint in the bridge that wasn't 100% level with the road surface. This caused the VSA to kick in briefly (2 seconds). After that the CEL came up and so did the VSA and "!" lights. Seems very odd that the O2 sensor and "lateral G sensor" came on at the same time after that incident.

scalbert

But had they occured before??

The reason I ask is that is a lot of sensor inouts to go at the same time. I'm not blaming the Unichip, I just wondered if something happened to the factory harness during the installation.

mrsteve

iTrader: (1)

This event occured about 3-4 weeks following my custom UniChip tune, so yes the UniChip was installed and had been installed for quite some time without problems.

mrsteve

iTrader: (1)

I took it in because there was a CEL light, plus the VSA and "!" lights.

scalbert

But it could still be related. Repositioning the factory harness was required. Could it have been in an ill position leading to quick fatigue or even some of the wires rubbing on something??

Just providing my $0.02 as when multiple problems occur for my I try and look for a common denominator. But in the end, they could all be just coincidence that they occurred at the same time.

mrsteve

iTrader: (1)

We'll see what they find today. It is all covered under warranty anyways and my dealership knows about the UniChip and doesn't have a problem with it.

mrsteve

iTrader: (1)

Steve,

Could the "ECM relation failure" point to a bad wire in the harness?

scalbert

Possibly, but it could also mean a bad ECU. I'm not familiar with that code, I'll look at the listing later though. But if it were a bad wire it could mean that one of the power supply leads is not supplying the expected voltage.

mrsteve

iTrader: (1)

Thanks,

When I hear back from the dealership I'll post their findings.

allmotor_2000

aka 'drifting'

AmooManiaK

aka "powersliding" with a fwd :gheywave:

Jonesi

Steve I think those tires need replaced.....

mrsteve

iTrader: (1)

Drifting in the CL-S

mrsteve

iTrader: (1)

They still haven't figured it out. (Probably too busy to get around to it). They did replace the 02 sensor and that code went away.

Damnit I wanted to go to the track tonight too. Maybe I should just go in the '04 TL loaner they gave me

ThinJim

iTrader: (3)

Way to much info.

dark knight

steve,if it is the ecu do you think they would replace it without a hassle?

mrsteve

iTrader: (1)

I have no idea if it is the ECU. Considering it happened right after I hit a bump, I tend to think it is a mechanical problem rather than electrical. Either way, I have an excellent relationship with Tischer and I know they'll take care of it.

mrsteve

iTrader: (1)

One thing I left out...

When I start the car, the CEL comes on right away. The VSA and "!" lights usually take 2-3 seconds more to come on.

Now if right after I start the car I rev the engine up (while in Park) let off, then rev up, etc, etc... the VSA and "!" lights do not come on until 2-3 seconds after I stop the revving.

mrsteve

iTrader: (1)

My car is ready. They replaced the O2 sensor and all 3 codes went away. Brandon took the car out for a drive (about 17 miles) and said the VSA worked fine; I'm sure he tested it out to its fullest

I'll be picking it up this afternoon. Everything fell under extended warranty coverage with the exception of my $50 deductable.

Don't know why it had those other two codes too. Weird...

scalbert

That is no entirely unheard of for "ghost" codes to be set.

mrsteve

iTrader: (1)

I'm just thankful it wasn't anything ECU or UniChip related

EricL

As Scalbert mentioned, "ghost codes" can show up. Some guy – or guys - programs one or more of the subroutines/tasks/threads in the ECU and it's going to be doing a whole lot of work (multitasking/threading) and it's pretty hard to test the ECU's program code for every possible contingency. Seeing as they aren't going to let us have their source code, anything is possible. You would normally go to the easiest or most important item to fix; IMO, that's the 02 sensor.

The lateral G sensor is used in conjunction with wheel sensors, a yaw-rate sensor and various heuristics to control the operation of the VSA.

I'm not sure about the "relation error code," but I wonder if the errors + your little black box that's tweaking the data the ECU is seeing could also cause an exception to be tossed in the ECUs code.

mrsteve

iTrader: (1)

I'm sure it is possible. But even though the VSA and "!" lights were on it seemed to me like I still had VSA active. I didn't have a chance to try and make it slip under wet conditions (i.e., leaving the line with too much throttle to make the wheels spin) but occasionally I felt like it was engaged during "spirited" driving conditions.

mrsteve

iTrader: (1)

What matters now is that it is working 100% normal.

Now when I pick it up today I need to talk to him about adding a little 5.5-6.0 PSI with a new "bolt-on."

Anyone want to buy a UniChip cheap? $400!

EricL

The indicators being displayed as an "error code" should not effect the dedicated subsystem that is integrating the yaw, lateral acceleration, and wheels speed info.

What I'm commenting on is: once you "diddle" with input signals, you are wandering into unknown territory. Not only is it difficult to test a few lines of "C" or C++ code, but it gets even more difficult to know what is going on when "expected" sets/ranges of data have been skewed/altered.

I'm not saying that's something is amiss or bad -- I'm just pointing out that once you start ganging up various systems and "fooling" with data, you can get some "strange" results. I've worked on a lot of multiprocessor systems and some of the errors and "weird" conditions were non-obvious and that was with everyone working under the same umbrella.


From the Helms:

"When the VSA system indicator and MIL are both ON, troubleshoot the PGM-F1 system first"

"When a problem is detected by self-diagnosis, the VSA control unit shifts to fail-safe mode"
As you said, it's fixed, so this is speculative and, at this point, academic...

mrsteve

iTrader: (1)

Thanks for the words of wisdom Eric