Question about 2000 Volvo S80

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How to replace PCM

Alternator is new battery is new too. We bought before 2-4 days. Control light for battery is on.

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  • Dada Miljakovic May 08, 2014

    Mechanic recomended to chek PCM but he has no tool for that. His computer can not do that. Other things was OK.

  • Vincent Competello
    Vincent Competello May 08, 2014

    Your mechanic has a child's toy, not a computer. Go to someone that knows something because having the battery light on is a simple fix!

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  • Volvo Master
  • 354 Answers

Why do you think it's the PCM?

Posted on May 07, 2014

  • Vincent Competello
    Vincent Competello May 08, 2014

    Your mechanic does not have a computer. He has a child's toy!! If your mechanic cannot diagnose a simple problem such as yours, you have to go to someone that can.

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99 Blazer V6 4x4 Intermittent start problem New battery Alternator? good Start a few times then won't, no sounds/lights Voltage read low Charge battery and it's good for a few days Any suggestions


When the vehicle is running check voltage at the battery . should be 13.1 to 14.1 volts , if not the alternator isn't charging . Doesn't matter if the alternator is new , has to have B+ voltage on the heavier wire connected to back of the alternator . The other wire connected to the alternator comes from the PCM/ECM . Is the Battery symbol light on when vehicle is running ?
The powertrain control module (PCM) or vehicle control module (VCM) turns the generator ON or OFF, by applying voltage to the generator control/monitoring circuit 225 (RED). The regulator in the generator also requests the charge indicator located in the instrument panel cluster (IPC), using the same circuit. When the regulator monitors that either a voltage high or voltage low condition exists with the engine running, a ground path to the PCM/VCM will be provided through the generator control/monitoring circuit 225. The PCM/VCM then sends a serial data message to the IPC requesting the charge indicator to be turned ON. The IPC monitors serial data messages from the PCM/VCM, and turns the charge indicator ON when requested. It mite be best if you take your vehicle to a qualified repair shop , unless you like making parts stores rich , buying unneeded parts .

May 18, 2016 | Cars & Trucks

4 Answers

I have a 2002 Jeep Liberty Sport the battery light comes on. Can not figure out the cause.


on driving, and it idle parked? hot and cold engine fails?
is hot idle at 800 or more rpm.
is fan belt slipping?
that battery light is charge system failure light
the regulator EVR discovers that fact and then glows the light.
what engine.? we cant help if you can not say what driveline is in this Liberty. the 4 banger 2.4 or the V6? 3.7L
the electrics are different on different engines..so....................?????
did you scan the PCM yet to see if there are DTC errors
after checking all fuses? related. (fsm shows related.. for sure)



now read this first.(quoting FSM)
The Electronic Voltage Regulator (EVR) is not a separate component.
It is actually a voltage regulating circuit located within the Power train Control Module (PCM). The EVR is not serviced separately. If replacement is necessary, the PCM must be replaced.
nor is it located in the alternator. as older cars have.
that top pin, is the Fusable link, must be 12vdc here, this is the LARGE wire, it must be good and the fuse LINK not BLOWN !!! is this clear?
this part (wire) i like all old jeeps, (no surprises)
and 13.3 to 15vdc running. is it?
the bottom pins below, are clear. as day. PCM controlled.

25820427-l14j4fdleibzw1xgq2q0eyq3-2-0.jpg

Aug 13, 2015 | Jeep Cars & Trucks

1 Answer

Alternator output 11.9vdc to 12.4vdc. Replaced with new alternator, same output as old. Car will not stay running due to battery running car. Any ideas?


Is there battery voltage at the bigger gage wire on the back of the alternator ? The other wire in the connector is a control feed from the PCM - engine computer , It is marked L ,if you hook a test light to positive battery terminal an touch the other point end to the L terminal an it starts to charge your alternator is not being turned on by the PCM ! Could have open circuit or bad PCM !

Jul 26, 2015 | 1994 Cadillac DeVille

2 Answers

I have 2003 Saturn Ion and I have bought a new


test the battery voltage while the engine is running, (you'll have to jump it again)
if you know the battery, voltage regulator and alternator are good, you may have to check all the fuse-able links on the car, all the vehicle grounds, and the fuses and relays.
if you put your battery on charge until it is fully charged and let the car sit over night and it is dead, either the battery is internally shorted or the vehicle is drawing far to much current and each circuit tested to find the short.

Oct 01, 2014 | 2003 Saturn ION

1 Answer

We bought two new battery's a new alternator checked all fusible links from alternator to battery. Truck only runs for a few days with battery light on then we have to charge the battery. It's an 2004


open or shorted alternator circuit (control wire)
let your auto store test the alternator charging
on and off the truck.
inspect 3 wire connector for burn or lose connection
disconnect 3 pin wire and start the engine.if the light stay on you have shot to ground.

Mar 25, 2014 | Ford Cars & Trucks

1 Answer

I have 91 Previa and about a week ago I was at a stoplight and the battery light flickered on and then my van lost power and died. I bought a new battery and all seemed well until 2 days later when


Hi

Yes it sounds like the alternator voltage regulator is wearing down and needs to be changed or replaced.

If you can get your hands on a 12 volt multimeter, turn the setting to 20 dc and place the negative wire on the negative battery post and the positive wire on the positive battery post.


The battery with motor off should be 12.6 volts and higher, start the the car the read out should be 14.,2 or higher.


You can turn the lights and heater on to see if the alternator can cope with the load.


if read out is less then you need to change or replace it.

Cheers

Nov 21, 2012 | Cars & Trucks

1 Answer

Oldsmobile alternator doesn't work after starting car.. Replaced both alternator and battery atleast 2 times already.. Don't know what the problem is. Checked all fuses, wires, stereo, grounds, etc. Read...


THE RED SMALL POSITIVE BATTERY FEED WIRE COULD BE BROKEN THAT GOES TO BACK OF ALTERNATOR.CHECK TO SEE IF POWER GOING TO THE WIRE.IT NOT POSITIVE BATTERY SMALL FEED CABLE BROKEN.OR YOU HAVE BLOWN FUSE LINK.IF ALL IS GOOD YOU COULD HAVE PCM PROBLEMS YOUR FIELD CONTROL CIRCUIT PART OF THE PCM CIRCUIT.HAVE VECHICLE SCANNED TO LOOK FOR ALTERNATOR PCM FAULT. AFTER YOU INSTALL NEW ALTERNATOR DONT CRANK THE CAR UNTIL YOU GET A SCANNER AND ERASE TROUBLE CODE FIRST BECAUSE THE PCM THINK OLD ALTERNATOR STILL IN VECHICLE AND WILL CAUSE CHARGING PROBLEMS.

Dec 29, 2010 | 2003 Oldsmobile Alero

2 Answers

Can not solve Battery charging fault on my Xzara Picasso.? The battery on my Xzara went flat and " Battery Charging Fault" message came up and the battery charging light stayed on.. The garage...


If the regulator in the alternator has no feedback from the battery voltage, it will overcharge the battery OR the alternator is faulty. If the alternator is spun and a 12volt current source is put on the field terminal, it should produce 14.5Volts and no more without anything else to control it. I reckon the alternator is faulty.

Mar 18, 2017 | 1986 Chevrolet Cavalier 2 Door

1 Answer

My husband replaced the alternator in our 2005 Dodge Stratus but the check engine light is still on. How do we get the light to turn off if there isn't any other problem?


scan it .to get code. when you replace alternator on most new cars.by the alternator being PCM CONTROL you have to erase the code before putting in alternator.because they wont charge.if you dont erase code.the PCM still thinks the old alternator.still in car.also make sure your battery is good also cables good.drive belt not slipping.and the alternator connectors not damage.

Jul 09, 2009 | 2004 Dodge Stratus

3 Answers

2002 kia sedona van


Hi,

There has been known issues with the alternator on several year/versions of this car. If memory serves me right, there was a TSB for the alternator either over or undercharging.The TSB (Technical Service Bulletin) specifies replacing the alternator and re-flashing the PCM.(Powertrain Control Mudule).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 19, 2008 | 2002 Kia Sedona

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