Hey guys,

Back from a 4 months trip, my V70 2005 non turbo will crank but not start.
I own this car for several years but I never had that no start problem before, it's the 1st time. This car has been a fairly reliable so far. I used to own several 850s and S70 in the past and I was able to troubleshoot most problems easily but I'm a lot less familiar with this model and don't know much of it.

The only thing I did is to spray some starting fluid into the intake hose, the engine started a bit but failed to continue running meaning that the ignition system, i,e: plugs, coil packs are OK. I've sprayed a second time, same thing.

Does someone knows where to start my troubleshooting?

Thanks a bunch
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Dennis

Hi Dennis,

Step 1: We can rule out an empty gas tank. :-)

Step 2: Check fuse 8

Step 3: Try to start it, THEN check for fuel pressure at the Rail.

IF You Have pressure: suspect the main relay, 2/32(enables the injectors)



IF You have NO Pressure: It is likely the fuel pump and/or
fuel pressure controller/PEM



Good luck, Bill

Hey Bill, Is the PEM mounted behind the interior panel on the starboard side rear quarter ? My V70 does the same, no start, no fuel at the rail. Always seems to happen after a soaking rain. This is AWESOME info ! -Rich
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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

You have a 2004, so it is outside, in the elements. Right rear, above the tank, same as Bill's.
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Keeping it running is better than buying new

I found it and took out the machine screw attached to what was the hold down bracket. It won't budge, please tell me I don't have to drop the tank to get at or at least release the connector. PIMA just getting the connector apart or the module out so I can inspect it. HELP.
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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

https://www.youtube.com/watch?v=NEQeoCnwOu0

You do know that Volvo moved the module to the inside of the cars. On the V70, someone moved the module to rest under the right rear seat (inside) as the wires were just long enough.
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Keeping it running is better than buying new

Hey Klaus, this YT Video is perfect, exactly what I had been looking for. Yes, mine is mounted on top of the gas tank just like in the Video. I will report back after I wiggle this out of the slide like he talked about in the video. Exactly what I as looking for Klasu, thank you !
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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

The video was perfect Klaus, I was able to get the module out. EXCELLENT ! Thank you again Klaus !
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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

I douched it out with electrical contact cleaner and applied the dielectric grease. Still no fuel at the rail.

The car still won't start. I am very new to the V70s. Lots of B230 experience this vehicle is new to me.

No change after cleaning and dielectric grease. No pressure at the rail.

Do you know how I can tell if the fuel pump is even turning on or not ?

Which relay is the Fuel Pump relay do you guys know ? I may need to loo at the relay as the culprit.

Or way to jumper the PEM out of the equation and apply +12 VDC to the pump to see if the module itself has gone bad ?

It may be the pump itself that has finally shit the bed. Fuse #4 is good. I just pulled it and checked it.

And I want to check the fuel filter to see if it is clogged or not. It's also a possibility.

Can you guys tell me how to verify the fuel pump is turning on or not ?
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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

You can listen for the fuel pump running when you first turn the key.
That only tells you if the motor is running- NOT if it's pumping.
No you can't run the fuel pump from +12VDC
The fuel pump is run by chopped DC from the PEM
It's unlikely the fuel filter unless someone poured cement in your tank.
You likely have a dead PEM. Try a bone yard or ebay for a replacement.
It can be the fuel pump, but I'd start with the PEM.

Bill

I am mostly deaf in my left ear from Naval Service, I can't hear shit anymore. LOL !!

The old B230s made a nice hum when the key was turned on, I can't hear anything going on except a relay clicking somewhere under the dash.

Does this 2.4 fuel management system use a F1 (Fuel Pump) relay or similar to supply voltage and signal paths ?

If there is one do you know where it is ? Maybe under the engine bay fuse box ? There may be a relay rack under the fuse box ?

Thanks,Rich
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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

A little birdie told me that unplugging the fuel pressure sensor will force the fuel pump to run at maximum. It will also turn on the CEL.

The only other way is to remove the seatback and access the fuel pump. Then supply 12V to the pump.

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Keeping it running is better than buying new

Excellent Klaus, I like it.

I am a B230 guy, this 2.4 is new to me so I am trying to navigate without being too annoying.

When the hood is open and looking at the motor from the front is the electronic sensor or transducer mounted on the right end of the fuel rail the replacement FPR for this 2.4 model and this supplies a varying voltage back to the PEM and then used modulate the fuel pump when the system calls for fuel ? That is what I see in front of me. And it is the way I understand it, or try to at least.

So do I need to disconnect that sensor at the right side of the fuel rail and see if I get fuel to the rail ? Obviously turn the key on. then see if I have any pressure on the schrader valve ? Correct ?

Rich


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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

Yep. With no reading from the fuel pressure sensor, the PEM is supposed to tell the fuel pump to try harder - more juice. That will only happen when trying to start the engine, flips the rear seat forward and try to hear the pump.

The PEM is easier to replace than the fuel pump.

My ears are also gone, but some noises are better than other. There are no fuel pump relays anymore, just the PEM. Look on Ebay.
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Keeping it running is better than buying new

You're awesome Klaus, we're speaking good Volvo language right here. This is awesome !

Thanks again and of course I will follow your instructions to the T.

I'll report back - Thank You Klaus !

Rich


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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

Hi Klaus and thanks for our note. I am having the same problem with my 2004 V70. I just put the car up on the floor jack and I found the PEM. The connector is plugged in as it should be, are there some clips or something that mount the PEM to the top of the tank ? I would like to pull the module out and inspect it for corrosion etc. Then reassemble after a coat of dielectric compound. I would rather just unplug the male/female connector if possible but it is wedged in there tight and I don't want to damage any wiring by yanking on it. Is there a release clip for the connector itself that you know of ? This is not a difficult fix I just need to get this connector off so I can reseat it after a good cleaning. -Rich
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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

Hi Bill,

Fuse #8 is OK, verified with a continuity tester.
Checked the main relay 2/32, coil & contacts. Everything is fine with it.

Checked fuel rail test port and almost nothing came out, just a little.
Seems it's the fuel pump or the fuel pump control module.

Now, how can I determine which one is causing the problem without
having to replace both parts?

For the fuel pump control module, do I have to remove the trimming
inside to have access to it?

Many thanks
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Dennis

Hi again Dennis,

You've narrowed it down some by finding no fuel pressure at the rail.

Some people listen for the pump when the key is put into RUN position,
if you don't hear anything you might first suspect the PEM and see if you can
get at the fuel pump connector to verify power. Here's the fuel pump diagram from the V70 wiring diagram that you should get. Brickboard timed out before
I could include this with the original email.



The Fuel pump circuitry is complex and not as straight-forward as you think
The Fuel pump is driven by Pulsed DC in order to achieve longer live for the pump
and higher fuel efficiency. I have yet to see a Volvo Circuit theory discussion in print. My sense is that the PEM is the culprit, but the pump
is always a possibility. Maybe someone knows a good way to tell without substitution?

Bill

Thanks a lot Bill and everyone for the replies.

I should be able to locate the problem with that info.

I'll let you know when it'll be fixed.

Thanks mucho
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Dennis

Hi again Dennis,

It's probably the PEM , and I saw a used one on Ebay for $30 shipped,
if you can't find one in a junk yard.

Please save the old PEM, the prices are so crazy that maybe it can be repaired.
An Autopsy of a dead PEM might find that there's maybe a TRIAC that failed and its
easy to repair.

Maybe some Volvo service jocks have tried before and will chime in ?

Bill

I've ordered one on eBay, $45 shipped. Should receive it on wednesday the latest.

I'll save the old one, a friend a mine who's an electronic tech will have a look
at it. Maybe it can be fixed otherwise I'll ship it to you if you're curious
enough to troubleshoot it!

One last question, do you know if that PEM is located inside or outside the car?
I've checked on the internet but the info is not very clear and/or contradictory.

Thanks a lot Bill

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Dennis

Hi Dennis,

I asked at the local parts place and the PEM is not available. What's the tariff for the PEM at the dealer ? (I've taken a sedative to be prepared for the answer)
Maybe your friend can find a discreet part that has crapped out, and you can be sainted by the Volvo fraternity for inventing a cheap fix for a common problem?

Some cars the PEM is outside and some inside, you can start by the gas filler and rear wheel well and look underneath, before pulling trim or whatever on the inside. Double check Youtube for videos.

Bill

Found the problem!

It wasn't the PEM finally, it was just the connector contacts that was corroded.
On my car, the PEM is located on the top of the fuel tank exposed to the elements.

As per my friend's advice who's an electronic tech, I've sprayed some 'DeoxIT D5'
into the PEMs connectors and the car started right away without hesitation.
The contacts has become oxidized after 4 months of inactivity, hence the problem.

I'll keep the other PEM that I've just bought as a spare.

Thanks all
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Dennis

You probably need to contort yourself one more time and smear the contacts with di-electric grease to keep the humidity at bay.

First, drive the car around a bit and put a smile on your face for finding and fixing the problem!! Well done!!
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Keeping it running is better than buying new

I did put some silicone dielectric grease on the contacts as per my friend's advice and your advice. With all that care, it should be trouble free for few years!

Thanks mucho all
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Dennis

Hey Dennis, yes I did that too after I douched it out with electrical contact cleaner.

The car still won't start. I am very new to the V70s. Lots of B230 experience this vehicle is new to me.

No change after cleaning and dielectric grease. No pressure at the rail.

Do you know how I can tell if the fuel pump is even turning on or not ?

Or way to jumper the PEM out of the equation and apply +12 VDC to the pump to see if the module itself has gone bad ?

It may be the pump itself that has finally shit the bed. Fuse #4 is good. I just pulled it and checked it.

And I want to check the fuel filter to see if it is clogged or not. It's also a possibility.

Can you guys tell me how to verify the fuel pump is turning on or not ?

Thanks you in advance for your help. Rich

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'72 P 1800Es Wagon ::'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900

Hey Rich, sorry for the very late reply. Someone passed away in my family lately.
I'm like you, I'm not too familiar with the V70. My experience with Volvos are on 850s/S70s, I've owned 5 of them. The 850s are the best cars I've never had. Still got 2, daughters driving them. For the no start problem on the V70, it was my very first technical problem that needed troubleshooting. If I were you, I'd replace the PEM (fuel pump controller module) there's plenty for sale on eBay. I've already bought one as a spare, apparently it's the common 'no start' problem on the V70s. The fuel pump technology on this car does work like the older Volvos like the 850s, you cannot bypass the controller to test out the pump. Let me know if I can be of any help. BTW: What year your V70?
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Dennis

I couldn't add a second photo with the Edit function, this is new for me.

Here's the simplified wiring diagram, I'd love to have Volvo's circuit theory here. We have many black boxes in this circuit.

Pins A & B from the fuel pump go to the CEM.

Adding to the misery is that the PEM was mounted outside the car on the tank. The PEM ain't cheap so grabbing one at a junkyard is one way to go.

My 2007 has it rerouted into the spare tire well. This was done (likely) because Volvo switched to a steel fuel tank that last year of P2 V70 production and mounting hardware on the fiberglass tank may not have been included on the steel one.

With all their engineering legacy they left it rattling about the spare tire well. I secured it with silicone rubber.
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Our 3rd V70

It sits right above the gas tank, do a You Tube search video

Very clear and thorough. Nicely done, Bill!

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Will I buy another Volvo??? We'll see....

Fuel pump relay is most common no start issue. There are many other possibilities, but that seems to be more frequent on these engines. It's under the hood, in fuse box, drivers side cowl area.

Any codes?

So it will start with difficulty but not stay running? If it cranks but doesn’t start at all I’d check the starter and related wiring. Actually, when the starter went on my 850 it would start fine cold but not start warm. Sounds like you have a different problem though.
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Will I buy another Volvo??? We'll see....