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Hi all,
I did the EBCM repair myself two weeks ago. I got the use of the ABS, and Traction Control On/Off again. However, the competitive driving still isn't there, which isn't a big deal to me.
All the previous codes have a H, by them now.
My main concern is that it's still throwing the
TCS C1284 HC / Service Active Handling code.
Which I looked up and it says "Lateral Accelerometer Circut"
I've scoured the forums and didn't find anything with a real clear answer. I was curious to know if any of you guys might now.
03 Z06.
Thanks
Last edited by Ethered; Mar 30, 2021 at 08:36 PM.
Reason: Better title
Are there any more codes ???? Most TC or active handling or ABS codes are caused by faulty wheel speed sensors--either bad or fouled or bad wiring
Remember----The ABS system--the TC system and the active handling system all use data from the wheel speed sensors on each corner--The TC and active handling uses the speed sensor data to prevent the rear wheels from spinning on a hard launch And the ABS system uses the wheel speed sensor data to prevent the wheels from skidding on a hard stop !!
they are all integral
Are there any more codes ???? Most TC or active handling or ABS codes are caused by faulty wheel speed sensors--either bad or fouled or bad wiring
Remember----The ABS system--the TC system and the active handling system all use data from the wheel speed sensors on each corner--The TC and active handling uses the speed sensor data to prevent the rear wheels from spinning on a hard launch And the ABS system uses the wheel speed sensor data to prevent the wheels from skidding on a hard stop !!
they are all integral
These are al the codes.
PCM
P1571 H
P1689 H
TCS
C1214 H
C1277 H
C1282 H
C1283 H
C1284 H C
C1285 H
I read somewhere that the circuit is located under the passenger seat.
That particular code has to do with the lateral accelerometer circuit, possibly a broken wire. The sensor is under the carpet, passenger side, near the torque tube tunnel, just behind the seat track mount. The wires route to the EBCM, so having a wiring diagram is a must. Most of the time, mice will chew through a wire somewhere. Some times the module can. be functioning intermittently is a way to toss this code, but usually you will find a broken wire near near the module, under the dash, or near the EBCM. Corrosion of the wire terminals is also not unusual if a passenger spills a drink over the module. Usually the corrosion takes time after the spill to cause a problem.
That particular code has to do with the lateral accelerometer circuit, possibly a broken wire. The sensor is under the carpet, passenger side, near the torque tube tunnel, just behind the seat track mount. The wires route to the EBCM, so having a wiring diagram is a must. Most of the time, mice will chew through a wire somewhere. Some times the module can. be functioning intermittently is a way to toss this code, but usually you will find a broken wire near near the module, under the dash, or near the EBCM. Corrosion of the wire terminals is also not unusual if a passenger spills a drink over the module. Usually the corrosion takes time after the spill to cause a problem.
By saying "that particular code", how in the world is the OP to know which of the 8 codes you are referring to?!
Last edited by grinder11; Apr 5, 2021 at 10:35 AM.
Here's the wiring diagram for the lateral accellerometer. It gets its 5v reference from the SWPS. This circuit also feeds the BFPS and the yaw rate sensor. so unless the other codes are related to these modules, It probably isn't likely the +5V is causing the current DTC. The low reference (ground potential) likewise is shared. so this leaves either a bad accelerometer or the signal wire going to the EBCM (the light GRN/Black stripe Pin P in the C102 Connector).
If you follow the diagnostic procedure in the FSM, you will get lost (been there done that), and spend a day doing it. I don't see how a dealer tech could read and perform all those steps and only charge one hour diagnostic time. This procedure is in a previous post on the forum. Takes a little looking, but it is there.
Here's the wiring diagram for the lateral accellerometer. It gets its 5v reference from the SWPS. This circuit also feeds the BFPS and the yaw rate sensor. so unless the other codes are related to these modules, It probably isn't likely the +5V is causing the current DTC. The low reference (ground potential) likewise is shared. so this leaves either a bad accelerometer or the signal wire going to the EBCM (the light GRN/Black stripe Pin P in the C102 Connector).
If you follow the diagnostic procedure in the FSM, you will get lost (been there done that), and spend a day doing it. I don't see how a dealer tech could read and perform all those steps and only charge one hour diagnostic time. This procedure is in a previous post on the forum. Takes a little looking, but it is there.
Appreciate your help! I was planning on checking all the wires this weekend. So essentially check all the wires & see if they're all good, if not replace the wires.
Otherwise replace the accelerometer.
I usually like to trouble shoot a little before clearing codes, but for the one you have, clearing all codes and driving the car to see if only the one code comes back might be a good idea. These particular modules talk to each other and there is one sequence where the swps zeros. To perform tha zeroing function, you need to drive in a straight line for 10 seconds. IIRC. Then if the all come back, you may want to look harder at the EBCM itself. If just the one code comes back, then the next thing I would do is pull the passenger seat, the shifter console, and check the+5v to low ref This would be with KOEO. Then check for 2.5v at the signal wire to low ref. If you have that, then you can dismount the LAS and move it to see if the 2.5 v changes.
If you have back-probed a connector and used a DMM, before, you have the knowledge to work this. . If not, I’ll take a picture of how to backpbrobe a connector and post it.
I am attaching the diagnostic procedure for C1284. One of the key things to check before digging too deeply into the electronics is to check to make sure the alignment is correct.
Bill
Last edited by Bill Dearborn; Apr 5, 2021 at 11:42 PM.
Traction Control Problems
