Pulled ECM and put back in...car will not start.

[precopster]

Always used the tool on multiple cars and never had a problem. Why does everything look so easy on You Tube?

[abscate]

Mike - can you get a non-fatal CEM-TCM/ECM comm error on a P2?

[precopster]

The question is whether he would have have that error by using the tool? As mbrian states the TCM and ECM share the power source in series with TCM being number 1 so it is more than likely a pin pressure issue.

Removing TCM on a working car and seeing what Vida comes up with would be interesting.

[chrism]

Home spun ECM tool:

download/file.php?id=35721

[mrbrian200]

I believe the ECM still gets power and ground if the TCM is removed: it's the connections to CANbus that are severed. With the ECU off the network the immobilizer system can't complete it's system checks, injectors and spark will never fire. Immobilizer function is shared between the ECU, CEM, and UEM. This is so that a thief would have to completely tear apart the vehicle, replace all three modules, and potentially reprogram everything in order to drive a vehicle away under it's own power.

Warning. Evil commentary ahead..
So theft rates are lower overall, but determined thieves now resort to carjacking. 20+ years ago owners rarely if ever came in direct contact with thieves, but interacted strictly with law enforcement. Which in most cases doesn't result in the owner's life being threatened at knife/gunpoint.

[sirdani]

Other then a dective ECM, the only think I can think of is low voltage or poor ground messing up the timing in the ECM or a defect in the CAN bus between the ECM and CEM.

Did you clean the connector when you had the ECM out?

1. Go to the search tab.
2. (✔) All information except parts catalog
3. Search for ECM-711A
4. (✔) Diagnostic trouble code (DTC) information

284: ECM-711A Engine control module (ECM), internal fault. Signal too high / signal too low. Permanent fault


Diagnostic trouble code (DTC) information

D2800349 Condition
Diagnostic trouble code (DTC) ECM-711A is stored if the engine control module (ECM) registers a fault in the internal circuit for the timer in the control module.

Substitute value
None.

Possible source
Faulty signal:
Defective control module.

Fault symptoms
The malfunction indicator lamp (MIL) lights.

I have the same code on a S80 2002. Have you fixed your ECM-711-A? If yes, how?

[inexus]

What was the remedy .? Could someone answer please because I’m having the same problem with my 99 t6.

[Grillmatt]

I have 2005 xc 70 pulled ecm and tcm be use I was getting no communication code to TCM pulled the ECM and TCM put everything back together now I have no communication to both will not run

[volvolugnut]

There is a special tool to remove both the ECM and TCM without damage. Hopefully you used the proper tool.
If you can remove the ECM and TCM again, inspect the terminals for any damage or misalignment. Perhaps you can straighten any pins that are bent. Be very careful.
With the pins inspected and straight, the modules are pushed straight down to fully make contact.
volvolugnut