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Start prevented try again, again

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SVO LOU
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Start prevented try again, again

Post by SVO LOU »

Guys,
Bought a non-running 03 xc70 to see if I can get it running for a daughter about to start driving in a few months.
According to the previous owners the car has always been a dream but one day they were driving, came home and car wouldn't start again, currently shows "Start Prevented, try again".
There's only one key and fob and I've tried locking/unlocking 5 times to reset the immobilizer with no help. I have another identical model car and swapped antenna rings and other car still runs and this one still won't crank.
Any other ideas for me to try? I can physically swap the CEM if anyone thinks it'll help but don't know if it has to be re-programmed.
I'm not getting any DTC codes with a foxwell uni-directional scanner I have.
Thank you.
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RickHaleParker
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Re: Start prevented try again, again

Post by RickHaleParker »

They will do that if the battery voltage is too low.
What is the battery voltage?
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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Re: Start prevented try again, again

Post by oragex »

Maybe the antenna ring? Also make sure the battery is charged, alternator is charging fine, all power cables are tight without cracks
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abscate
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Re: Start prevented try again, again

Post by abscate »

DOes start inhibit on P2s stop cranking or result in a crank no-start condition, like P80s?
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SVO LOU
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Joined: Sun Dec 18, 2016 12:50 pm
Year and Model: 01 V70 XC, 06 V70
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Re: Start prevented try again, again

Post by SVO LOU »

RickHaleParker wrote: Fri May 03, 2019 11:06 pm They will do that if the battery voltage is too low.
What is the battery voltage?
Battery voltage is 12.3 but drops to 11.75 when the key is put in position II, guess from the headlights, taillights, and some interior lights on from having the doors open.
oragex wrote: Sat May 04, 2019 3:45 am Maybe the antenna ring? Also make sure the battery is charged, alternator is charging fine, all power cables are tight without cracks
Antenna ring was swapped but no difference.
abscate wrote: Sat May 04, 2019 6:09 am DOes start inhibit on P2s stop cranking or result in a crank no-start condition, like P80s?
Sorry, I should've been more clear. When I turn the key to start I hear the fuel pump prime but it doesn't attempt to crank.

In fact, if I charge the battery with the ground terminal off the battery, I insert the key and turn it to POS II and as soon as I re-connect the battery terminal the "Start prevented try again" shows up on the DIM.
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RickHaleParker
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Re: Start prevented try again, again

Post by RickHaleParker »

SVO LOU wrote: Sat May 04, 2019 6:30 pm Battery voltage is 12.3 but drops to 11.75 when the key is put in position II
Battery is flat dead, 0% charged. Try a known good battery. No sense in doing anything else until this is dealt with.

I suspect the battery has been the problem all along. Focus on the battery.
In fact, if I charge the battery with the ground terminal off the battery, I insert the key and turn it to POS II and as soon as I re-connect the battery terminal the "Start prevented try again" shows up on the DIM.
How are you determining that the battery is taking a charge and what it's State of Charge (SoC) is?

A flat dead battery on a 6A charger would take at least 48 hours to charge, If it does take a charge.
I have brought batteries back from 0%, sometimes it took weeks on the charger. Other times it never happens.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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Re: Start prevented try again, again

Post by oragex »

As above, try a new battery but also make sure quickly if the alternator is charging it properly. You should see at start up in the morning some 14.5V with the engine at idle - it may drop later on once the battery has been topped.

A well charged battery will be near 12.7V, however this should be measure with the engine and all lights and computers off - this car takes exactly 10 min. to shut off all computers after the key has been removed from the ignition www.youtube.com/watch?v=VsrmpXpZGVs

The next test would be to measure the battery before parking the car, then again the next morning before starting it, and see if the voltage has dropped overnight (= parasitic drain)
SVO LOU
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Re: Start prevented try again, again

Post by SVO LOU »

I'll definitely swap in the battery from the other volvo tomorrow and see what happens but from what I've always seen a battery is usually around 12.3V without the vehicle running and about 14.3V when it is. I've been slow charging it (2A) for today only but will try it for longer.

Also, I don't think the alternator is a factor yet since the car won't crank but I guess it could be if it's internally shorted and draining the battery?!?!?!?
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Re: Start prevented try again, again

Post by RickHaleParker »

SVO LOU wrote: Sat May 04, 2019 9:17 pm I've been slow charging it (2A) for today only but will try it for longer.
At 2A it should take at least a week to fully charge from 0% SoC.
The theoretical minimum time is 80 hours @2A for a 160 amp-hour battery but it never charges that quick.
2 amps * 80 hours = 160 amp - hours.

1. Connect battery to charger, let it charge until the charger reads full charge.
2. Disconnect battery from charger for 15 minutes.
Repeat steps 1 & 2 until take it does not take much time to reach 100%
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
SVO LOU
Posts: 23
Joined: Sun Dec 18, 2016 12:50 pm
Year and Model: 01 V70 XC, 06 V70
Location: Greenville, SC
Has thanked: 13 times

Re: Start prevented try again, again

Post by SVO LOU »

After your post I let it charge at 2A overnight then switched it to 6A for half the day then, between one of many tasks on the honey-do list, I swapped batteries. The battery I've been charging, from the no-start car, cranked up the car that already starts. The battery from the car that starts still wouldn't start the car, still shows "Start Prevented try again" when the ignition is turned to position II, before I even attempt to crank it.
Guess I'm still in the same boat...Aargh.
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