SYS on display and speedometer and odometer stopped working

[ZuggZR1]

Originally Posted by -=Jeff=-

My feeling? ECM is bad.. I do have a question.. with no jumpers and you turn key on, what does SES do?

No serice engine soon light comes on just occasionally the SYS light pops up on the sleed display and the trip and speedometer stay at 0000

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[ZuggZR1]

Originally Posted by -=Jeff=-

My feeling? ECM is bad.. I do have a question.. with no jumpers and you turn key on, what does SES do?

So if ECM is this a regular ECM or does the ZR1 have a special ECM? Ill start shopping around

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[Ccmano]

Originally Posted by ZuggZR1

Her is jumper results tonite: Jumper A&B: https://www.dropbox.com/s/h3mca5zpct...A%26B.mp4?dl=0

Jumper A&G: https://www.dropbox.com/s/3mdow9gpv7...A%26G.mp4?dl=0

What was your feeling.

I had a feeling you should be seeing codes and there they are. The 1.0 and C41/H41 after is an ECM Serial Data Error. Which means the CCM and ECM are not communicating. The 4.0 with err after means the same thing from the ECM side. Now comes the tricky part. It’s either the ECM itself or a fault in the wiring (bad connection, short or open). Start with the diagnostic tree for Code 41.

ECMs are unique to ZR-1’s, but any year will work in any other year. Don’t assume it’s the ECM. It could just as well be the wiring. Do the diagnostics. You could be shelling out $500-$1000 for nothing.
H

[DRM500RUBYZR-1]

Have you followed the diagnostic procedure for the CCM?
I believe it is in section 8d of the FSM.
The big volume not the smaller one.
SYS is the error message for the CCM.


Marty

[ZuggZR1]

Here is my current ECM info

[ZuggZR1]

looking at the diagnostics now. Just trying to figure this out. Still a newbie to the ZR1 family.

[-=Jeff=-]

Originally Posted by Ccmano

I had a feeling you should be seeing codes and there they are. The 1.0 and C41/H41 after is an ECM Serial Data Error. Which means the CCM and ECM are not communicating. The 4.0 with err after means the same thing from the ECM side. Now comes the tricky part. It’s either the ECM itself or a fault in the wiring (bad connection, short or open). Start with the diagnostic tree for Code 41.

ECMs are unique to ZR-1’s, but any year will work in any other year. Don’t assume it’s the ECM. It could just as well be the wiring. Do the diagnostics. You could be shelling out $500-$1000 for nothing.
H

While I agree it could be wiring, my suspicion of the ECM is due to the fact that the SES flickers on and then off. If there is someone near you I suggest either seeing if they would be willing to help you test out the ECM, you could put your ECM in their car or their;s in your car.


I have attached the 2 pages for Checking for No SES, which is what you have, or where I would start.. looking at the tree diagram on the second page it refers to fusible links on the first page. I would find those pins and probe from there using the test light. I wonder if the fusible link is bad..

Do you have the following tools:
-Circuit Test Light
-DMM

DMM is useful if you don't have one the cheap (or sometimes free with coupon) one from Harbor Freight is decent and will get the job done..

The Diagram refers to ECM connectors (A,B,C,D), the pins are marked on the connector and ECM (not all but a few then you count)

ECM connectors:
A - Yellow or Gray
B - Red
C - Green
D - Brown

I have also attached the ECM Connector pin out


Let us know if we can help

[ZuggZR1]

So i wanted to update you and and say thank you for all the help and guidance on this journey. Today i was disconnecting the ECM from the ZR1 after talking to Mark. He told me to keep my Epromm chip and cover. When i took the cover off i noticed that one of the clips that holds the epromm in place was not completly pushed into a locking position.

So i took the epromm out and reseated it and heard both sides click. I then tugged on the epromm and it was secure. Then plugged it all back in and turned key. No SYS error ans the SES light came on as expected. So for fun i hooked up my odb1 scanner and it said no teouble codes.

Took the ZR1 for a ride and everything was normal again.

Again thank you all for your support and help20200209_160926.jpeg

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[Ccmano]

Glad you found it! Its amazing how the simplest things can cause issues.
Drive your car and enjoy!
H

[-=Jeff=-]

Originally Posted by -=Jeff=-

Have you checked the MEMCAL in the ECM to be sure it is seated properly

I suggested that on page 2 of this thread.. glad it was a cheap fix