Dealer said MDS Solenoid 1st and replaced it
Then they tested and said it was ECM/PCM COMPUTER. Why could they not tell it was ECM/PCM to start with. Installing ECM Monday but they will want to charge about $400 for the Solenoid and I'm doubting that both Solenoid and ECM WENT SAME TIME OR that bad ECM CAUSED THE BAD Solenoid ???

 

Dealer said MDS Solenoid 1st and replaced it
Then they tested and said it was ECM/PCM COMPUTER. Why could they not tell it was ECM/PCM to start with. Installing ECM Monday but they will want to charge about $400 for the Solenoid and I'm doubting that both Solenoid and ECM WENT SAME TIME OR that bad ECM CAUSED THE BAD Solenoid ???

 

You may want to confirm with the dealership that they verified there is not a short to battery in the harness to the solenoid, that they've checked for restricted oil passages, checked the lifter, and confirmed they didn't install a faulty solenoid before agreeing to have them change out the PCM. These are all steps that should be performed per the factory troubleshooting for a P1411 diagnostic code.

-Rod

 

Thanks Rod....Good info you posted. I believe the dealer said the voltage out of the ECM/PCM was 14v and should be 12v. Not sure what else they based the idea on that the PCM was bad ?
There was a mouse nest under the intake cover but dealer said there was no damage to wiring.
What I was wondering mostly was if a bad PCM/ECM could cause a MDS Solenoid to go ??? My guess is that it should not. Also, I believe an MDS Solenoid can be checked by applying 12v to Solenoid Terminals and check for popping sound for correct operation.
Paul

 

If they measured 14 V from the PCM to the MDS I'd sure hope they checked the system voltage to the PCM. For the overall system, 14V would not be unacceptable, and I'd be pretty concerned if other system components intended for system voltage were not designed with proper de-rating to survive 14V. I'd also be very curious how something like a bad voltage regulator internal the PCM would only effect one MDS solenoid. Did they measure the activation voltage to the other solenoids as well? If so and they were less than the 14V they measured on the solenoid for cylinder 1, I'd again ask if they tested for a short to battery voltage (other than assuming it's through the PCM). I highly doubt each solenoid has its own voltage regulator (if they're truly regulated and not designed to run off of system voltage). Now if the MDS solenoids are designed to work off of something much lower than 12V (such as 5V) then 14V could damage them. I didn't see anything during my quick look at the P1411 troubleshooting to explain what voltage the solenoids are designed to work off of. Knowing that would be important for your MDS solenoid testing as well.

-Rod