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ETS & Problem
Posted by David Prantl (more from David Prantl) on Thu, 8 Jun 2000 20:49:44
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

I enjoyed reading the excellent description of 'drive-by-wire' supplied by 
Mr. NINES.

Here's some info that may interest owners of '92-'93 9000 turbo models with 
TCS (traction control system).

These cars have a drive-by-wire system which is called ETS (electronic 
throttle system).  The ETS ECU is located under the driver's seat, and is 
accessible from the rear footwell once the driver's seat is moved all the 
way forward.

Besides the ECU, the major component in the system is an electronic throttle 
body unit.  This unit incorporates an electric motor to move the throttle 
flap, and a throttle-flap-position-potentiometer to tell the ECU how far 
open the flap is at any point in time.

Finally, there is a pedal-position-potentiometer, that tells the ECU how 
much 'go' the driver is asking for.

If the any of the ETS components, or if communication between them stops 
working, or if a related circuit or system should develop a problem, there 
is a limp-home throttle cable.

This cable is attached to the pedal arm just like in 'normal' cars, and 
leads to the electronic throttle body, where it is either engaged to or 
disengaged from the throttle flap by means of a spring and a vacuum 
actuator.

When no vacuum is present (ie. engine off), or when the ECU turns off the 
vacuum supply to the throttle body (by means of a solenoid valve), the cable 
is engaged.  When vacuum is present, and allowed to reach the throttle body, 
the cable is disengaged, and ETS is in effect.
---
For the past 2 weeks I have been tinkering with our 'new' '93 9000CSE, which 
is determined to run only in limp-home mode.  After finally getting in to 
the local dealer for an ISAT/Tech2 code-pull, I got the following info:

Trionic codes P0130, P0135 - indicating a bad o2 sensor.
ABS/TC code E7061 - communications fault between TCS and ETS ECUs.

I had previously determined the o2 sensor fault through the 'Check Engine' 
light.  I also ran the ETS ECU pin tests, and the only circuits that were 
out-of-spec were the two that talk/listen to the TCS ECU.

I could whine about how a 'communications fault' with the TCS should not put 
the ETS into limp-home mode, but that would be rather futile.

I will continue trying to fix the problem so that all functions are restored 
as specified.

If I should not be successful, I am thinking of ways to disable the TCS 
function, and just go with Trionic/ETS/ABS.

If anyone has done this successfully, please drop me a line.  Any experience 
with wiring modifications or ECU swaps would help.

If anyone has a repair procedure for ABS/TC code E7061, I would greatly 
appreciate a copy if possible.  Or, if you could point me to the appropriate 
service manual section, I could go ahead and purchase it.

Thanks in advance.

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP
'86 9000T, 5M, 180kMi
'88 9000S, 5M, 137kMi
'90 9000S, 4A, 133kMi
'93 9000CSE, 5M, 63kMi
'89 900, 3A, 115kMi
'68 97 Sonett V4, 76kMi, #000467
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