2001 computer problems?

Tiny
MATHEWILEY
  • MEMBER
  • 2001 DODGE CARAVAN
I have 2001 grand caravan, 2wd, 3.3 flex fuel, 118,000mi. It all started with the a/c going out and running ragged. I ran the codes and it came up throttle position sensor, replaced. I used a connector lube on this and the Idle Air Motor in the throttle body. This made the connectors rather easy to slide on and off, but it was running fine. It didn't fix air so I took it to the shop where they replaced a/c High Pressure Switch. It ran great for about 2 days then check engine light came on. I took it to the shop, they said it was ECM, so I replaced with a rebuilt one. I installed the new one and I am still having same problems. I'm getting p122, p123, p107, p106, p1478, p1496, p1648, p118. All pertaining to voltage. So I took it to Autozone and they tested battery and alt. Both were good, battery had a low charge. So I charged it with no improvement. The symptoms are I will start it up, check engine light comes on, and it begins to tach up and down between 950-2500 rpms. The battery light will come on and it will idle off at about 1500rpms after 30 sec. Of running. While driving it will immedately try to drive off when putting into gear and wants to run about 25 mph WITHOUT ever touching the gas pedal, but with pressing the pedal the engine will start to choke out, trans. Will slip after 40mph or if pedal is pressed to hard. I was told that the rebuilt ECM was also no good but the same symptoms persist. Where do I start now?
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Saturday, August 25th, 2007 AT 2:00 AM

3 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Has the alternater been checked for overcharge. When the battery light is on?
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Saturday, August 25th, 2007 AT 5:17 AM
Tiny
MATHEWILEY
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Yes, the battery and alt. Both checked out. I just recieved the second ECM and these codes came out: P118, P106, P1478, P601, and P1684. The 601 code is a new one so I looked it up and it says internal computer error, ON THE NEW ONE! I am gettting so frustrated with this van. The other codes mean map sensor voltage low at startup ( I charged battery 12hrs. Prior to installing new ECM.), Coolant temp. Sensor too high, batter disconnected in last 50 starts, and the internal error. The temp. Gauge works if you turn the car on but don't start, and while running it falls back to cool. What's up with that? Where do I start now?
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Wednesday, August 29th, 2007 AT 10:23 PM
Tiny
SERVICE WRITER
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If your'e frustrated now, you aren't gonna like this.


https://www.2carpros.com/forum/automotive_pictures/30961_pcm2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/30961_pcm1_1.jpg




https://www.2carpros.com/forum/automotive_pictures/30961_mitchel_1.jpg

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Did Autozone do this?
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Thursday, August 30th, 2007 AT 2:38 AM

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