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Pcm location

Tiny
JERRY BETZ
  • MEMBER
  • 2005 DODGE STRATUS
  • 2.4L
  • 4 CYL
  • FWD
  • 128,000 MILES
Need to know where to find the PCM. I have looked high and low for it under the hood but have not been able to find it. Also, I need to know where fuel pump relay is located at as well as the pcm. I assume that I may need a new one because when I turn the key on the brake light comes on and does not turn off, but there is not a broken line anywhere and it is full of fluid
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Sunday, December 4th, 2016 AT 10:05 AM

17 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
PCM is right next to PDC under hood and fuel pump relay is in pdc. See pictures.
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Sunday, December 4th, 2016 AT 11:34 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,970 POSTS
Yup, it is attached right under the "smart" fuse box. Brake light coming on does not have anything to do with the fuel pump relay though. More likely a bad switch or shorted wire if the brakes are working properly.
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Sunday, December 4th, 2016 AT 4:21 PM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
Mine does not have a PCM near the PDC, but it has a ECU in the PDC, but still cannot find fuel pump relay and cannot get power to the fuel pump unless I run a hot wire from battery to it. But, that will not do me any good if I cannot get the injectors to pulse and operate properly.
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Sunday, December 4th, 2016 AT 8:36 PM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
Like I said cannot find the PCM. I have taken fuse box out but cannot find it.
I have the 2.4 s.O.H.C. If that makes a difference.
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Monday, December 5th, 2016 AT 12:18 AM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
Just talk with Chrysler dealer and the said it should be in center of engine compartment in firewall and if not there it is more than likely under dashboard.
Thanks so much for all of your help in this matter.
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Monday, December 5th, 2016 AT 5:11 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,970 POSTS
Okay, your picture is the relay box of a 2004. Using that the MFI relay that controls injector power is the middle one on the left in your picture (A-18). Fuse 24 (15 amp) is the fuel pump power feed.

Pump relays one and two are in the junction block (inside car) on the right side of the block. There will be two empty spaces on top right then C-305 is fuel pump relay one then an accessory relay and C-307 is fuel pump relay two.

Staying with 2004 the PCM will be behind the glove box attached to the heater plenum.
Sorry for the confusion. Mid year changes can get interesting.
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Monday, December 5th, 2016 AT 6:41 AM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
Is that the bottom of the heater box just below the radio?
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Monday, December 5th, 2016 AT 7:25 AM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
Because I was thinking about it being behind glove box but when I removed cover it was not there and Chrysler dealer said it should be about middle of the car. If that is true then it should be somewhere in the vicinity of the radio. Have you ever run into a problem like this because it sure is confusing?
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Monday, December 5th, 2016 AT 7:33 AM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
And then on another note I have a. 2004 Chrysler town and country that has 197000 on it and the problem with it that I have is a cylinder three misfire and a o2 sensor heater problem o2 sensors have been replaced already plugs wires and coil have been replaced as well, but I am still have the same problem any thoughts on how to fix these issues a good friend told me that it could be compression loss but that did not make sense to me because you can feel it missing at idle. But, when driving down the road it does not seem to miss at all then the other night I watched a video on YouTube about another vehicle that had a random misfire and it was crankshaft sensor and I wonder if that could be what is wrong with it as well?
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Monday, December 5th, 2016 AT 7:44 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Misfires are hard to detect, it could still be a basic engine problem as well. the reason you do this is so you do not spend money on good parts that you have already changed and not the problem. You can check fuel pressure with a gauge and check for a vacuum leak.

Here some guides that can help

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

and

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run some tests and get back to us so we can continue helping you.
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Monday, December 5th, 2016 AT 8:09 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,970 POSTS
Misfires can be a bear. With a single cylinder it's a bit easier. You've changed the plugs/coil/wires so that should rule out ignition issues. Next in line would be to unplug the injector and test it to see if it is shorted or failed open. Or you could pull the injector and move it to another cylinder and see if the misfire follows it. Not fun on those engines. If you have access to a scope it makes it easier, you can look at two injectors and see them operating. An old trick is to thread a piece of hose down next to the injector and listen at the other end to see if you hear the ticking as the solenoid opens/closes. A quick compression check wouldn't hurt, as you friend mentioned it is possible for a compression loss to cause a problem. Let us know what you find.

On the PCM, it could be behind the radio toward the middle.
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Tuesday, December 6th, 2016 AT 4:47 PM
Tiny
JERRY BETZ
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  • 24 POSTS
OK thanks I will let you know what I find
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Tuesday, December 6th, 2016 AT 4:55 PM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
What do u think that the o2 sensor problem is they ar both new upstream and downstream but the upstream is the one that's saying that it has a heater problem and that is why I changed them as well as the coil died as well for the back three cylinder s which in turn made the cat red hot and that's when the heater problem started so I changed them and still have the problem
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Tuesday, December 6th, 2016 AT 5:03 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,970 POSTS
If it got that hot I'd look at the wiring harness itself for damage. The heater circuits are not hard to trace. One side goes to ground and the other is switched power. What code shows up? Those can sometimes be a good pointer. Oh which engine 3.3 or 3.8?
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Tuesday, December 6th, 2016 AT 5:37 PM
Tiny
JERRY BETZ
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  • 24 POSTS
3.8
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Tuesday, December 6th, 2016 AT 5:56 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,970 POSTS
OK
B1 S1 - Upstream O2 sensor heater uses a BRown w/Light Green tracer for the power control and BlacK w/Light Green tracer for the ground side.

B1 S2 - Downstream O2 sensor heater uses a BRown w/WhiTe tracer for the power control and BlacK w/Dark Blue tracer for the ground side.

They connect the grounds at a splice (S100) and from there to a battery ground. Simple voltage test would show if they shorted to power and a continuity test to the bat negative terminal will show if they are open.

Upstream BR/LG wire goes into Connector 2 on the PCM at terminal 18
Downstream BR/WT wire goes into Connector 3 on the PCM at terminal 9

If they are open or grounded the heater circuit will throw a fault.
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Wednesday, December 7th, 2016 AT 12:18 PM
Tiny
JERRY BETZ
  • MEMBER
  • 24 POSTS
OK thanks I will check it out tonight when I get home
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Wednesday, December 7th, 2016 AT 1:13 PM

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