ImperialCrown, I think the relay is proven good. The A14 fused circuit has 12.8v at the relay. Two of four possible problems seem to be eliminated. So, K342 ASD circuit open or PCM. PCM is an EBay unit that was “supposed” to be good. It was from an established seller and not cheap. Mike programmed it for me so I’m confident in the programming. When I can, I plan to swap the old ECM in to see if the no start remains. Thank you for helping me. Michael

 

Solve for P0688. See Possible Causes.

 

All, I am grateful for your willingness and knowledge. I think I will survive the kidney stones. There are things worse than electrical problems.
Yesterday I checked some. First - A - there is a box around P; B - I could not feel a click in the ASD relay. BUT I pulled it and found 12.8v on both RD/Y wires. I tested the relay with test leads and meter. With current and ground on the primary side, resistance across the switched side was zero ohms. My terminology may be wrong but I think it is clear. Second, with the “new” ECM in place, my scan tool showed:

PCM P0688 active ASD main sense circuit
TCM P1684 stored batt disc
DDM B210D stored door volt low
PDM B210D stored door volt low
CGW U0100 stored lost comm with ECM.

Notice that P0688 is the only active code. I can swap the old ECM in but wanted to report this first. That and getting under the car to access wiring will wait a few more days. Michael

 

Thanks, Jerry. I am just clearing a little from the morphine. If y’all ever have a choice, don’t have kidney stones. I will study this information and start measuring as soon as I can. Michael

 

"Probably the ECM" doesn't sound like a competent shop's answer to me. There is an answer if you follow the proper troubleshooting procedure & have the proper tools. This will need a capable scan tool to diagnose the problem.
Always diagnose first. You may want to reinstall the old parts & start over.

The ASD relay will not stay on with the key on if there is no crankshaft position sensor signal (engine not turning). It will come on when the key is first turned on for a second or so.
Do you hear the fuel pump 'hum' in the rear for a second or so when the key is first turned to 'run'?

I borrowed this from Allan's post. Pins #1 & #2 from the battery are hot all the time. When the PCM grounds #5, the relay will close the contact & current will flow to #4.
The PCM will lift the ground from #5 to turn the relay off.

 

These cars don't have points and condensers, Michael. They're run by the computers and sensors.

 

chuzz, I think Michael's comment was a joke.

Jerry

 

Allen, thank you. I am making sense of this a little at a time. It appears that I should see 12v on the downstream side of the primary side of the relay. The TIPM controls ground. What should I see on the secondary side? I will find and check the connection and splice. That is clear. The “implausible VIN” DTC and another similar occurred before I changed anything. I cleared codes and didn’t have performance issues, other than the occasional limp home. It finally got bad enough I thought it could be diagnosed. I have not put the reader on since I changed the ECM. Waiting for input from Mike.
ImperialCrown, I cannot remember. The first time it occurred was about four years ago. Then a highly recommended automotive electrical shop diagnosed it as “probably the ECM.” I did not know I was headed for PT hell when this started. Should have stayed pre-computer I guess. Doing this between rotator cuff surgery and kidney stones. Getting old is not for sissies.
Michael

 

. . . . I am making sense of this a little at a time. It appears that I should see 12v on the downstream side of the primary side of the relay. The TIPM controls ground. What should I see on the secondary side? I will find and check the connection and splice. That is clear. The “implausible VIN” DTC and another similar occurred before I changed anything. . . . .

Let's review and identify information about the problem(s) for a clear understanding. Originally there was an intermittent condition such that the vehicle would go into LIMP mode and no shifting of gears of the automatic transmission. There was a code P0882 associated with this transmission controller issue. The engine would start and run. Previous to this you would occasionally receive a message which alluded to invalid or implausible configuration data. Since both of these issues were happening BEFORE the PCM and TIPM change, it is highly probable these error codes were caused by a wiring problem / poor electrical connection and NOT a module failure.

An incorrect diagnosis led you to replace the ECM / PCM and TIPM. Now you have a NO START and NO CRANK situation. Replacing the PCM and TIPM have introdued new unknows into the situation.

(A) Let's tackle the NO START situation. Do you see a square box around the P R N D display in the instrument cluster with igntiion key switch in the ON / RUN position?

(B) The ASD and Starter relays are located on the firewall, driver side. Refer to post #5 by contributor ImperialCrown, dated Nov 1, 2023 for the location in the schematic. The ASD and starter relay have unique wiring colors. Locate the ASD relay by wire colors. See attached image. Place your hand on the ASD relay. Have a helper turn the ignition key switch to the ON / RUN position but not START. Do you feel the ASD relay click and remain energized for 1 - 2 seconds and then de-energize? Report your results for test (A) and (B).

 

What is the actual fault code (DTC)? Communication, Mismatch or Implausibility codes may start with a 'U'.
New modules must be configured for the vehicle when swapping. Trying to undo this may be difficult.
The vehicle's configuration/identity is kept in the TIPM.

 

Allen, thanks for taking time on this. I have been reading today. Am a little over my head. I’ve been asked about the ASD relay. Found it this afternoon. I didn’t mention in this thread - codes I got included something like VIN not recognized or implausible VIN. That is part of what caused me and others to strongly suspect the ECM. In one of the links you provided wiring to the transmission to (from memory) C132 and a splice. Was that applicable or only an example. Thanks. Michael

 

. . . . I have been reading today. Am a little over my head. I’ve been asked about the ASD relay. Found it this afternoon. I didn’t mention in this thread - codes I got included something like VIN not recognized or implausible VIN. That is part of what caused me and others to strongly suspect the ECM. In one of the links you provided wiring to the transmission to (from memory) C132 and a splice. Was that applicable or only an example. . . . .

There is an error code / diagnostic message about implausible VIN or VIN not recognized. Did this appear after replacing the ECM / PCM? If YES then you have created a REAL BIG issue with this vehicle. Besides the VIN programmed into the PCM, there is other configuration data unique to the vehicle that is retained in the PCM. This is shared across the network with other modules. So you may have an updated VIN in the PCM but other data stored in it is not compatible with your vehicle. Do you still have the original PCM? If YES install it and see if the implausible messages disappear.

I will display again the wiring diagram for your specific vehicle that shows connections between PCM and TIPM. Comments on the schematic explain testing procedures and checks to be made.

 

Allan, you helped me put this together more. I have never seen the odd (to me) small square fuses - they look more like little relays. But I know where 18 is now and should be able to locate the ASD relay.
Jerry, the car would intermittently fail to shift, often with the traction control light on, and go into limp home. It finally got frequent enough that I had a really good transmission man check it. He said it was the TCM or TIPM, not the transmission. I replaced the TIPM with a rebuilt Dorman TIPM. That produced no change. Started fine, ran smoothly, no shift. Had nonsense codes over a long period leading up to this. Usually or always had low voltage to transmission (P0882, I think). Bought an EBay ECM and had it flashed/programmed with my VIN and mileage. Installed it and have no start/no crank. I still think it might be points and condenser. Michael

 

. . . . the car would intermittently fail to shift, often with the traction control light on, and go into limp home. It finally got frequent enough that I had a really good transmission man check it. He said it was the TCM or TIPM, not the transmission. I replaced the TIPM with a rebuilt Dorman TIPM. That produced no change. Started fine, ran smoothly, no shift. Had nonsense codes over a long period leading up to this. Usually or always had low voltage to transmission (P0882, I think). Bought an EBay ECM and had it flashed/programmed with my VIN and mileage. Installed it and have no start/no crank. . . . .

It really is frustrating for an automobile owner when he / she relies on so called "experts" to diagnose problems. In the end it is just guess work and firing the "parts cannon" and hoping for a fix. You replaced the TIPM and the PCM and still no fix. The problem is most likely in the wiring between the PCM and the TIPM and NOT the modules themselves.

Do you have your original PCM and TIPM? I would reinstall those items so at least you can get the engine to start.

There is communication through direct wire cabling between the PCM and TIPM. The PCM instructs the TIPM to power up a circuit and expects a response. In this instance it is communication between the two modules to energize the transmission control system. The PCM is not seeing the expected response from the TIPM that it has energized the solid state relay associated with pressure control solenoids in the transmission. So the diagnostic code is set.

This code P0882 has been discussed in recent posts on the forum. Read through each and you will get the idea of wiring to check.

https://www.allpar.com/threads/another-p0700-p0882-thread.240318/#post-1085292088

2006 Pt Cruiser pcm help!

Hi guys, I recently acquired a 06 pt and right off the bat I knew the battery light wasn't going to be a dead battery nor alternator. Needless to say, I found over a year old paperwork from a shop saying the pcm was bad. I tried my luck with a duralast preprogrammed pcm and wouldn't even test so...

www.allpar.com

. . . .I still think it might be points and condenser. . . . .

There is solid state circuitry or micro relays soldered onto a circuit board that energize transmission control. So you need to check applicable wiring to determine if proper voltages are present.

 

. . . . Either incorrectly or there is nothing within ALLPAR. I did find conflicting information outside of ALLPAR. Is the ASD in the TIPM or somewhere else. The owner’s manual identifies an ASD maxifuse but not a relay. It may be on the inside of the old TIPM lid but I don’t remember which direction I threw it. . . . .

Post #5 by contributor ImperialCrown shows the starter relay and ASD relay adjacent to each other on driver side of firewall. It is not in the TIPM fuse box. Fuse #18 provides power feed to the control side and load side of the ASD relay. Since it is 40 amp, it is larger than blade type fuses.

Attached are images of fuse #18 location and schematic for the ASD relay wiring.

 

Jerry, ImperialCrown, just home from church to get a look. Thank you both for quick help. With what y’all gave me I am a lot more oriented. Will see what I find and put the meter on it tomorrow. No reason to think this is the problem but need to rule it out. I know you already told me to troubleshoot, ImperialCrown. Michael

 

What are the symptoms of your problem with the PT?

What is it doing or more likely, not doing?


Jerry

 

ImperialCrowns post does look more like what you want.


Jerry

 

 

It says that it is number 18. An ASD relay contact power feed.


Jerry

 

Will this help?

2006 Chrysler PT Cruiser fuse box diagram - StartMyCar

www.startmycar.com

Jerry

 

Jerry, thanks, yes. I still have to figure out what the thing is. It’s called a fuse but looks more like a little relay. I need to do some digging and find an FSM for this car. It has turned on me. Michael