C1255 - EBCM Internal Malfunction


C1286 - Steering Sensor Bias Malfunction ( where exactly is this sensor located?)
I also have the stablity reduced message, from what I understand this had to do with a combonation of awhobbly front end, bad struts & defective steering sensor, Everything wasreplaced but the steering sensor.

C1710 - Left Front Damper Actuator Short Circuit to Battery (is this the wheel sensor plug?)

C1738 - Exhaust Solenoid Valve Short to GND


I just had Passives installed in the front & have rears passive for a long time, no TC or ABS light, but I am getting service ride control message in the DIC with the above codes.

Its either on of these sensors, im pretty sure the 97 rack is the same as the 97

heres a pic

http://i173.photobucket.com/albums/w63/91parkave/DSCN0458-1.jpg

The diagnostic posts are for a 98 Concours, should be the same, there is an other code 1255, EBTCM internal Malfunction, if you need that one, I can post that as well.

DTC C1256 EBCM Internal Malfunction
Circuit Description
This DTC identifies a malfunction within the EBTCM.

Conditions for Setting the DTC
An internal EBTCM malfunction exists.

Action Taken When the DTC Sets
A malfunction DTC is stored.
The ABS remains functional.
The ABS indicator remains OFF.
Conditions for Clearing the DTC
The condition for DTC is no longer present and you used scan tool Clear DTCs function.
The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
The EBTCM does not detect the DTC in 50 drive cycles.
Diagnostic Aids
When the scan tool displays the DTC, 2 more numbers follow the DTC. Note the 2 numbers and any other DTCs. The 2 numbers with the DTC are an engineering aid in order to determine the cause of the internal malfunction.
Make sure the integrity of the connection between the EBTCM and the BPMV is secure, tight, and free from corrosion.
DTC C1256xx EBTCM Internal Malfunction Step
Action
Value(s)
Yes
No

1
Was the Diagnostic System Check performed?
--
Go to Step 2
Go to Diagnostic System Check

2
Are any valve solenoid DTC present (C1261-C1274)?
--
Go to Diagnostic Trouble Code (DTC) List
Go to Step 3

3
Turn the ignition switch to the OFF position.
Disconnect the electronic brake traction control module (EBTCM).
Check for damaged, pushed out, or miswired terminals.
Was any damage found?
--
Go to Step 4
Go to Step 5

4
Repair any wiring as necessary. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to Diagnostic System Check
--

5
Replace the EBTCM. Refer to Electronic Brake Control Module (EBCM) Replacement .

Is the replacement complete?
--
Go to Diagnostic System Check
--

Here is the second code, these are for sure far more important than the last two.

Circuit Description
The EBTCM learns the steering wheel center position in every drive cycle. Once established, the steering wheel center position should remain fairly constant.

Conditions for Setting the DTC
All of the following conditions occur:

The steering angle has been centered.
The center steer angle bias value is more than 20 degrees from the initial center position.
Action Taken When the DTC Sets
A malfunction DTC is stored.
Stabilitrak® is disabled.
The DIC displays the SERVICE STABILITY SYS message.
The ABS/TCS remain functional.
Conditions for Clearing the DTC
The condition for DTC is no longer present and you used scan tool Clear DTCs function.
The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
The EBTCM does not detect the DTC in 50 drive cycles.
Diagnostic Aids
Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a flat surface.
Find out from the driver under what conditions the DTC was set (when the DIC displayed the SERVICE STABILITY SYS message). This information will help to duplicate the failure.
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
Poor connections, broken insulation, or a break in the wire inside the insulation may cause an intermittent malfunction.
If an intermittent malfunction exists, refer to Intermittents and Poor Connections in Wiring Systems.
The Snapshot function on the scan tool can help find an intermittent DTC.
DTC C1286 Steering/Lateral Accelerometer Sensor Bias Malfunction Step
Action
Value(s)
Yes
No

1
Was the Diagnostic System Check performed?
--
Go to Step 2
Go to Diagnostic System Check

2
Turn the ignition switch to the RUN position, engine OFF.
Using a scan tool, read ABS/TCS/ICCS DTCs.
Are DTCs C1282-C1285 present?
--
Go to Diagnostic Trouble Code (DTC) List
Go to Step 3

3
Using a scan tool, perform the Steering Wheel Position Sensor Test. Refer to Scan Tool Diagnostics .

Is the analog and digital display on the scan tool within ±5 degrees of each other at the center (zero) position?
--
Go to Step 5
Go to Step 4

4
Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor Replacement in Variable Effort Steering.

Is the replacement complete?
--
Go to Step 9
--

5
Perform the Diagnostic Test Drive while monitoring the Yaw Rate Input parameter on a scan tool.

Is the voltage within the specified range?
2.3-2.7 V
Go to Step 7
Go to Step 6

6
Replace the yaw rate sensor. Refer to Yaw Rate Sensor Replacement .

Is the replacement complete?
--
Go to Step 9
--

7
Turn the ignition switch to the RUN position, engine OFF.
Monitor the Lateral Accelerometer Input parameter using a scan tool.
Is the voltage within the specified range?
2.3-2.7 V
Go to Step 9
Go to Step 8

8
Replace the lateral accelerometer. Refer to Lateral Accelerometer Replacement .

Is the replacement complete?
--
Go to Step 9
--

9
Read the diagnostic aids and conditions for setting the DTC.
Cycle the ignition switch from the OFF to the RUN position, engine OFF.
Perform the Diagnostic Test Drive while monitoring a scan tool for ABS/TCS/ICCS DTCs.
Did DTC C1286 set as a current DTC?
--
Go to Step 10
Go to Diagnostic System Check

10
Replace the EBTCM. Refer to Electronic Brake Control Module (EBCM) Replacement .

Is the replacement complete?
--
Go to Diagnostic System Check
--

First, thanks for the prompt responses.

2nd, I cleared all the codes, I have not checked if thet returned.Will do so shortly.

3rd, There are 4 instances when The STABLITY REDUCED message will come on. At as frequently as soon as I put the car in Drive sometimes, other times it will come on while sitting @ a light, sometimes it will come on while drving straight down the rd, than it will come in after the system is activated & is done doing what ever it does.

today it worked fine during some spirited driving.

Its either on of these sensors, im pretty sure the 97 rack is the same as the 97

heres a pic

http://i173.photobucket.com/albums/w63/91parkave/DSCN0458-1.jpg


theyare located that far under the car? :ill:Is that the left side of the car?
Looks like its a PIA without a lift.