Could not get the PCM to communicate

Tiny
MOVIEMASTER1988
  • MEMBER
  • 2003 CHRYSLER PT CRUISER
Electrical problem 4 cyl Two Wheel Drive Automatic 80,000 miles

I have an 03 Pt Cruiser with almost 80,000 miles on it and its really not making any sense to me. The history on the car is as follows: At 77,000 miles we had the fluids changed, which included the transmission fluid being flushed, two weeks later my entire transmission failed. It sat for a number of months outside before sitting again at Chrysler. Chrysler said they could not get the PCM to communicate, so they replaced it and said it still would not communicate. We went to Amco who said the battery was to dead to communicate with the PMC. They totaly rebuilt the transmission and I replaced the battery. I also appearntly blew (while the car was dead) and had to replace fuse #18 (20amp, yellow) in the Power Distribution Center box under the hood. It's used to control Ignition-Off Draw = IOD. The owners' manual explains that it's used to keep the battery from draining during extended storage. The Car ran fine for a few months but all of a sudden it started running hot when in park, I added coolant and it seemed to stop. Then a strange noise, like a gurgling, would sound from under the car when I would accelerate quickly from a stop, but only for a second. The final straw was when in park and idleing there would be a buzzing sound that lasts a second or two and from under the hood a poof of steam or a wisk of smoke would come out, its hard to tell which. I took to firestone who previously, right after the transmission problem, said I had a coolant leak and that my water pump was about to go, thinking that this could be the problem. I get a call from them that that the car is inside their garage and it wont crank. They also tell me that the check engine light came on while the car could still turn on, which had never happened for me, and said they pulled the Codes:
P1681-Malfuntion Control Output Circuit
P1604 - Same Message
P0462- Fuel Lever Sensor Low Voltage
P0340- Cam Position Sensor Circuit
P0335- Crankshaft Position Sensor Maulfuntion A

The Firestone people didnt know anything about anything. They blamed the computers in the car. I got a call the next day, they say now it starts and I drove it home and it drives fine, but the engine light is still on. I dont know what to do, is it worth saving this car, is the pcm bad(even though I just replaced it)?
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Thursday, May 21st, 2009 AT 5:56 PM

4 Replies

Tiny
KEN
  • ADMIN
Hello,

The first thing you should do is scan the computer for codes so it can point us in the right direction.

Here is a guide to help

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

To could also be the ASD relay which had big problem in the at car.

Here is a diagram (below) and a guide to ehlp you get the problem fixed.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please run some tests and get back to us we are interested to see what it is.

Cheers, Ken
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Saturday, July 29th, 2017 AT 3:26 PM
Tiny
BUDDYLATS
  • MEMBER
  • 2001 CHRYSLER PT CRUISER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 53,902 MILES
Computer problem
2001 Chrysler PT Cruiser 4 cyl Two Wheel Drive Automatic 53902 miles

Problem started with trying to get my car inspected. The NY State computer could not make a connection to my car.

Replaced computer and still can't connect to NY State inspection computer.
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Saturday, July 29th, 2017 AT 3:26 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Hi
Problem most likely in wiring to Datalink connector so chek that all wires are secrue at connector. If good then use OHM meter to check Light Green wire at datalink terminal #6 to PCM connector 2 terminal # 75
Let me know
Thanks for donate
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Saturday, July 29th, 2017 AT 3:26 PM (Merged)
Tiny
BHURSEY
  • MEMBER
I had this problem with my cruiser this spring.

Took it too many different inspection stations, same problem. Took it to the Chrylser dealer and had to have my computer replaced. When they took it off there was some oil in it, that had come from a leak in a an oil sender (?) And had that fixed too. Immediatly connected to NC inspection no problem.
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Saturday, July 29th, 2017 AT 3:26 PM (Merged)

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