usmanaziz

Hi all,

Sorry for keeping new threads on the different issue.

My local mechanic said two codes are visible for abs.

C1203- ECM/EV Communication Circuit
C1336 Zero point calibration of Deceleration sensor undone

EMPS ECU is not responding - Do i have to get new ECU or the steering rack needs to be replaced.

The car had a front impact but upon inspection nothing was damaged to ABS unit near brake booster and ECU/ steering rack area.

This club is able to solve more issues than my mechanic which is days plus more $$$ :P

Thanks

Jwconeil

We secretly voted Lobux into moderatorship so he would stick around and diagnose our cars 🤣.

viprez586

Verify you have power & ground to the steering ECU, first.

This is somewhat difficult since it's under the battery.

What's your level of wiring diagnosis?
I can help you, but I don't have the time to teach it to you.

usmanaziz

Honestly I have zero knowledge of trace but I can try if you can point to me in the right direction. I have a power probe tester to test it.

Is this any link with ABS?

usmanaziz

I know! feel like buying him a pizza for every issue he fixes :P

viprez586

It's on a multiplex CAN network so yes there's always the possibility of module to module interference.

Check your 80amp EPS fuse in the passenger underhood fuse box first.
That supplies the EMPS module power to the Red pin 4 connector A31.

Pin 5 on A31 is black and is ground.

Pin 9 on A31 is black with yellow tracer and ignition switched 12v from ECU IG 10amp at LH kick panel fuse block.

lobuxracer

iTrader: (2)

TIS says the ECM is bad with that DTC. The only other possible according to the service manual is the brake actuator assembly (ABS unit). Was the engine computer changed out after the wreck? There's an initialization you'd need to do with Techstream if this is the case. This is the yaw sensor calibration. It is possible to do without Techstream, but I've never done it the alternate way.

viprez586

I believe he posted the same question in the Facebook groups, and there's other codes in modules. When this happens usually it's only 1 or 2 codes that lead to the root failure.

When there's codes in multiple modules, you especially need to pay attention to what module is setting what code & they're correlation on the network.

​​​​

lobuxracer

iTrader: (2)

Good point. What are ALL the DTCs your mechanic is seeing? Is it just these two or are there more?

usmanaziz

Nothing was replaced from car.

Should I change the ABS unit?

The mechanic has some Launch x pro scanner. maybe he can initialise it from there.

usmanaziz

The fuse rail is all good with fuse intact- I will trace the wiring and report back- the new ECU is costing me $381, I just hope its a wiring issue.

thanks

viprez586

If the power steering ECU is bad, I recommend upgrading to the 89650-53042 unit.
You can read about it here.

usmanaziz

I cannot source that ECU here, the whole GCC don't have that part #, IS F is very rare here in middle east.

Dumb question- will a 89650-53040 fit 2012? My salvage yard has that ECU from 2008 ISF.

Or buying from states is my only option and price is $$$$$$-

lobuxracer

iTrader: (2)

It will work, but the steering will not be as nice as your original. I have the -42 unit in mine, and it was worth every penny especially with wider front tires.

usmanaziz

I would try to get it sourced in few days or check my local area first.

Quick question is the ABS DTC has an correlation with EMPS? my mechanic says its because of abs fault the emps is not working ( I am like wut).