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New PCM? (P1490 code)

 
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  #11 (permalink)  
Old 18 May 2017, 09:06 am
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Default Re: New PCM? (P1490 code)

Quote:
The inova should at least reset the DTC for at least a start and short idle before the ECU reactivates it for a issue. If it does not then you may a ECU issue
Thanks for your information.

When using the Innova, I can clear the code while the key is in the on position and the Innova replies that the code was successfully cleared. But immediately after clearing, you can see the CEL blink for a few seconds, then remain on and DTC P1490 reappears to the Innova. The Innova reports a failure to clear codes when the engine is running.

When using the key dance, I will get the same (p1490) code, then the CEL will blink for a few seconds, then remain on. Key dance again and the same code (P1940) appears. I'll stop using this method for now per your suggestion.

Oh, and ECU (Engine Control Unit)=PCM (Powertrain Control Module), right?

Last edited by CRPerryJr; 18 May 2017 at 09:10 am.
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Old 18 May 2017, 09:36 am
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Default Re: New PCM? (P1490 code)

Quote:
Originally Posted by CRPerryJr View Post
Hi folks, and thanks for all the help you have been so far. I need an educated opinion on my conclusion before I drop a few hundred additional bucks on a new to me 2001 PT Cruiser (Non-turbo 2.4) with 178,000 miles that is currently in "limp home mode".

The temperature sensor did not work when I got it, so I replaced it and the thermostat. I now get a temperature reading.

I received a P1490 error and tested the Radiator Cooling Assembly and found that the low speed side did not work. I have also never gotten the High speed side to work normally either, but it did test ok at the radiator plug. So,

1. I replaced the assembly, reset the code, and I still get the P1490 error, and the fan still doesn't power up as it should.
2. I tested the new fan at the radiator plug and the new fan tests good on both the low and high speed side.
3. So I checked continuity to every wire connecting to the fan (all 3), which is good.
4. I checked the relay on the low speed side. Applying 12v to the Radiator Fan Relay Control circuit (at the relay) and the relay clicks and the fan powers on.
5. So I remove relay and check continuity from PCM connector 2 pin 55 to Radiator Fan Relay Control circuit at the relay and it is good.
6. Reinsert relay and apply 12v to PCM connector 2 pin 55, and the relay clicks and the fan turns on. ( I also did this to pin 69 to test the high speed side and that works as well.)
7. Checked and cleaned the connectors to the PCM with electrical cleaner, pins all look good.
8. Put everything back together, clear the codes, and P1490 reappears and the fan does not work. (And I'm still in Limp Home Mode.)

Is it time for a new PCM? Does Limp home mode prevent the fan from working?

Thanks for your help!
Are you getting any codes for the limp mode?

If not I would suggest pulling the wire going to the camshaft sensor and see if a code is triggered for the camshaft sensor.
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Old 18 May 2017, 10:35 am
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Default Re: New PCM? (P1490 code)

Quote:
Are you getting any codes for the limp mode?
The only code I was getting is the P1490. But new development:

I took it for a short drive to see if maybe running it around the subdivision may help figure things out. I left my code reader connected and was watching the live data while I drive. It's still in limp home mode, but 2 more codes came up. P0700 (TCM request) and P1495 (LDP Solenoid). My scanner is supposed to be able to read the transmission DTCs, but was unable to communicate with the TCM.

Quote:
If not I would suggest pulling the wire going to the camshaft sensor and see if a code is triggered for the camshaft sensor.
I pulled the connection to the camshaft sensor and got a P0340 (Camshaft Position Sensor Malfunction), so I believe that is the expected result. I plugged it back in and I cleared all codes again with my Innova, and the P1490 (Low Speed Radiator Fan) and P1495 (LDP Solenoid) are the only codes remaining at the moment, but I haven't driven it again. I did run it through the gears, and it still feels the same (Clunk into Drive or Reverse) and the RPMs still don't go over 3500 before the engine limiter kicks in.
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Old 18 May 2017, 11:07 am
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Default Re: New PCM? (P1490 code)

I would suggest you take your PT Cruiser to a transmission repair shop where they can tell you what the transmission codes are that is triggering the generic transmission code P0700. Some shops will give you an idea of what the problem might be and a free estimate. I got my transmission codes for free at a transmission shop near where I live but because I still had a warranty I took my PT Cruiser back to the dealer to take care of it.
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  #15 (permalink)  
Old 18 May 2017, 11:13 am
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Default Re: New PCM? (P1490 code)

On your radiator fan issue P1490 I would suggest checking all the plugs going to the PCM. Check to make sure all contacts are good.

Check the fuse #5 in the under the hood fuse box. 40 amp fuse.

Check the fuse #12 in the fuse box under the dash. 10 amp fuse.
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Last edited by ptcruisersteve; 18 May 2017 at 11:23 am.
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  #16 (permalink)  
Old 18 May 2017, 11:27 am
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Default Re: New PCM? (P1490 code)

I recommend that you re-peat the Innova reset/clear but turn the key completely off and remove it from the ignition between resetting procedures and do the procedure at least twice before starting the engine.

Many Diagnostic Tools/devises will show reset or clear but sometimes only internally depending on how your procedure to clear them is used. It is not as straight forward all the time as clear reset and you are good to go.
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Old 18 May 2017, 11:40 am
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Default Re: New PCM? (P1490 code)

Quote:
Originally Posted by NitroPT View Post
I recommend that you re-peat the Innova reset/clear but turn the key completely off and remove it from the ignition between resetting procedures and do the procedure at least twice before starting the engine.

Many Diagnostic Tools/devises will show reset or clear but sometimes only internally depending on how your procedure to clear them is used. It is not as straight forward all the time as clear reset and you are good to go.

Good to know!
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Old 18 May 2017, 12:29 pm
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Default Re: New PCM? (P1490 code)

Quote:
Check the fuse #12 in the fuse box under the dash. 10 amp fuse.
DING DING DING!!! We have a winner! This fuse was blown! I replaced it and cleared the codes per NitroPT's recommendations, and VIOLA! No more codes, the fan works, and I can drive normally again!! You all rock!! Thank you! thank you! thank you!!!
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  #19 (permalink)  
Old 30 Nov 2020, 05:05 am
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Default Re: New PCM? (P1490 code)

Quote:
Originally Posted by ptcruisersteve View Post
On your radiator fan issue P1490 I would suggest checking all the plugs going to the PCM. Check to make sure all contacts are good.

Check the fuse #5 in the under the hood fuse box. 40 amp fuse.

Check the fuse #12 in the fuse box under the dash. 10 amp fuse.

So its 2020. almost 2021. I was about to order a new computer today which I may still have to do but here's the thing.

I followed the link to the post about checking the fuses in the relays and I found something amazing.


I am literally the most accident-prone stupid a smart person in the world. or maybe I am the stupidest person in the world who owns a PT Cruiser but enough of that more on this:
https://fuse-box.info/chrysler/chrys...001-2010-fuses

FUSE BOX INFO.org


as I'm looking down the page I realize that there are some relays for the headlights that I have missed well check it out in my car I don't have any relays in any of the locations below


the important thing to know are these fuse box locations:




№ Amp/Color Items Fused
  • 1 25 Amp/ Natural Headlamp Switch
  • 2 15 Amp/Blue Exterior Lighting
  • 3 20 Amp/ Yellow RKE/Door Locks
  • 4 20 Amp/ Yellow Power Height Adjust
  • 5 10 Amp/Red Airbag Run Only
  • 6 10 Amp/Red B/U Electric Back Light (EBL) NEU SAF
  • 7 25 Amp/ Natural HVAC Blower
  • 8 15 Amp/Blue Fog Lamp (Domestic Only)
  • 9 10 Amp/Red Airbag Run-ST
  • 10 10 Amp/Red Cluster/RKE/SKIM
  • 11 10 Amp/Red Engine Module/ABS-TRAC
  • 12 10 Amp/Red PDC Relays/LDP
  • 13 10 Amp/Red Interior Lighting
  • 14 20 Amp/ Yellow Sunroof/Overhead Console/Radio
  • 15 20 Amp/ Yellow Wipers/Comb. FLS
  • 16 10 Amp/Red Auto Stick/Ignition Off/ Run
  • 17 15 Amp/Blue Heated Seats
  • 18 10 Amp/Red Heated Mirrors
  • 19 10 Amp/Red Rt Headlamp
  • 20 10 Amp/Red Lt Headlamp
  • CB1 25 Amp Circuit Breaker Headlamp Switch
  • CB2 20 Amp Circuit Breaker Power Window
  • R1 LHD: Headlamp;RHD: Heated Seat
  • R2 LHD: Heated Seat; RHD: Headlamp
  • R3 Not Used


turns out I'm missing fuses and relays so I'm going to try checking that out first tomorrow morning when I get to work and or at least at lunch and then after that I might actually have headlights on my car that operate from the new headlamp stock I installed.

after that it's on to basically go ahead and try to fix the fan if I still need to order the computer for the fan I will but I have a funny little thing that it's probably me missing some fuses and stuff like that.


this should probably be in its own thread but I wanted to go ahead and say thank you for this little bit of encouragement.

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2001 PT cruiser.
49,000 miles
Custom Dealer installed aftermarket sunroof
worst car I have ever owned from a reliability standpoint.
Canadian spec car imported to the states.
Wish I could just rewire everything and use a Minivans ROCK SOLID electrical system in this car.
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Old 21 Dec 2021, 06:42 am
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Default Re: New PCM? (P1490 code)

And on the eve of being 2022...
"Da Compooter is fugg!"

I have had a new one I ordered from EBAY programmed to my Canuck PT for quite some time. so it looks like I'm going to be throwing it in probably before Christmas.

I had a major computer failure and I couldn't get codes and right now I physically cannot turn off my car so I have it on a charger and what I mean by that is that the dash lights won't go out and my remote won't work also the central locking doesn't work either.
I can hear the relay do its job but the locks aren't moving.
but I am at least able to go ahead and get codes now from the computer so that's a good thing.

one of the weird symptoms that cropped up was that the high-speed fan was on all the time when I started the car and I realized right then and there yeah there's something wrong.

3 days ago the instrument cluster alarm LED was blinking really fast and after that it would not stop no matter what I did no matter how I reset it.

also the instrument cluster always is on and even if you take the key out.
the car also refused to shut off I could not turn off the engine even though all the accessories would turn off and I've already replaced the ignition switch a while ago and it's fine.

WHY THIS POSSIBLY HAPPENS & CAUSE/Theory

1. The Rad Fad starts to go bad THEN, the RELAY starts having a large inductance on the coil, and then back feeds to the ECU, and then fries the Mosfet/ transistor on the EC you and then is unable to make it work or function.

2. You pulled the relay while the battery was connected and it fried the Rad Fan driver in the ECU.

3. possible static electricity spike.

4. relay use that did not have a flyback diode.

5. Uncle Murphy just decided to visit and he decide to bring his in-laws..


How to prevent the above?

1. Check your fan for Current draw and noise.

2. Disconnect the battery before working on your car.

3. Ask someone smarter then me. I have no idea.

4. Use Hella good Relays, OR ensure it has a diode in the Relay. Hella will be happy to answer this for you as well as Omicron, Bosch etc. and...If your dealer says it does? GET IT IN WRITING.

5. Not much you can do here. if you can find a mechanic like the car wizard, you're in good hands but other than that be careful when you take your car in to be serviced by any old Joe or Nancy.

almost all my problems in my PT Cruiser we're right after I had somebody work on it and I wish I was making this up but I'm not.

Critters that love to eat wires, corrosion , Bad electric connections and grounds also can rear its ugly head.
it's really hard to find sometimes but you can use a Multimeter and it should be able to tell you if you have any wiring issues.

also a battery that has a dead cell can wreak some Havoc with your ECU so make sure your battery is in good condition.


PREVENTIVE MAINTENANCE
1. The low speed fan relay does take quite a bit of current and eventually the contacts will become weak or some other malady may happen.
Especially if the fan is getting older the brushes or wearing down and you seem to have more noise coming from the fan so it's a good idea to exchange your fan out especially after so many hours of operation since it is a brushed fan.
I recommend every 3-5 years depending on how many hours of operation you have on the fan.

2. check your wiring harness after any extended period that you parked your vehicle because again some of these issues happen because of Critters that start chewing on wires or excessive moisture buildup in faulty weatherproof connectors.

3. electrical cleaner or kegs contact gold which I recommend is a great idea in your fuse box especially if you are in a very damp or humid climate.

4. if you live in the Rust Belt you can guarantee that you're going to have grounding issues one time or another do something called the Big 3 upgrade.

5. there's a grounding strap in your brakes this is probably essential for some of you with wheel bearing issues however it can also lead to static electricity so make sure to inspect your grounding cables on your front brakes make sure they're in operation and they are actually working.
it's a long shot but like I said Murphy likes to visit at very unexpected intervals.

6. if you're going to wash your engine bay it's probably a good idea to have a good leaf blower around to dry it afterwards and try not to get any water in any of the electrical connectors I know it's hard to do but it's possible. Or better yet just use a rag and some WD-40. if it's good enough for the Apollo space missions it's good enough for your PT Cruiser.

7. a multifunction switch failure and melting of the connector can cause a short circuit to go directly to the ECU (It can and does) , so be very careful when replacing this part.
These connectors often burn, and therefore probably short-circuit either internally into the multi-function switch or on the connector itself.

Its a REALLY good idea to switch over to LED Fog lights that are a fraction of the load of the incandescent bulbs. this will save your free time from being gobbled up by replacing multifunction switches and of course any burnt wiring or connectors. You can also use a high-quality relay harness.

8. And, the most important thing that you could do to prevent future problems is this:
DISCONNECT THE BATTERY BEFORE EVER WORKING ON YOUR CAR PERIOD!
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2001 PT cruiser.
49,000 miles
Custom Dealer installed aftermarket sunroof
worst car I have ever owned from a reliability standpoint.
Canadian spec car imported to the states.
Wish I could just rewire everything and use a Minivans ROCK SOLID electrical system in this car.
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