2004 V70R Ignition issue

dmechnic · Post by **dmechnic** » 23 Jul 2020, 20:26

So i just dropped $6500 getting work done on my “baby” and the wife drove it home (mistake). Ends up it was running rough the whole way & threw P0302 and P2302 codes just as she got home. The guy had told me he used some liquid tape to cover some of the coil wires as they were exposed by the connectors. Ok, not the best way but I get it if it’s just a little bit. I open the hood at home expecting a grounding issue on #2 to find a shit show goop and wires. Ends up the insulation is brittle as can be on the first three cylinders so I unplug those as well as the cam sensors (which were marked) and expose everything and wrap each one individually with electrical tape for temporary patch. Got it all back together, covered & wrapped up, plugged everything in and now it seems I have ZERO ignition. The engine isn’t coughing or even attempting to catch, just cranking. I have not looked for an ignition relay/fuse to see if something popped. It is also not throwing any codes at all, so I’m at a complete loss. Any help would be greatly appreciated.

And am I unfortunately correct in that VOLVO integrates the ignition coil wires into the ENTIRE system harness, requiring me to splice in replacements?? Whose dumb idea was that?!?! You’d think they’d know those heads get pretty hot and destroy those wires over time.

Post by **abscate** » 24 Jul 2020, 04:58

Look for 12 volts on the pinoutson one of the coils to see if you are getting supply voltage. The supply fuse takes out both ignition and a bunch of other stuff on these cars

Fewer than 5% of mechanics can actually wire. It’s a plug and replace job, nowadays

Post by **oragex** » 24 Jul 2020, 05:06

Yes, the harness is big and goes all round the engine into the ECM. So it has to be cut - can get the wires on top of the engine from a junkyard quite easily in good condition assuming it's from car with same VVT solenoids. Not all cars get these wires damaged from heat, so pretty easy find at the junkyard

Post by **RickHaleParker** » 24 Jul 2020, 18:11

oragex wrote: ↑24 Jul 2020, 05:06 Not all cars get these wires damaged from heat, so pretty easy find at the junkyard

If one wants new harnesses they can be found at Dave's 240 Turbo.

The 2004 - 2007 S60R/V70R connectors are slightly different. But a non-R can be modified to fit.

: R_Coil_Harness.png (227.04 KiB) Viewed 1004 times

dmechnic · Post by **dmechnic** » 24 Jul 2020, 18:56

So I checked and the fuse was blown, tried a new fuse and it immediately popped so clearly something is shorting out. Stripped everything and there are a couple places that I’m highly suspect of. Going to look into shrink tubing supplies in a roll and try to pull each pin and sheath them all the way back. Gotta YouTube how to pull the pins now.

dmechnic · Post by **dmechnic** » 27 Jul 2020, 12:57

Ordered new plugs with 24” whips and will be splicing/rewiring the 5 plugs. Also adding shrink wrap to the wires running from the main harness line to help protect and maintain them

Post by **darrylrobert** » 28 Jul 2020, 00:33

Use a small nail to pull the pins, ive replaced a few broken connectors on mine

dmechnic · Post by **dmechnic** » 31 Jul 2020, 06:40

New plugs with fresh wiring is in...now come to find there is a P0234 code, there is next to no boost, and the speed sensitive steering isn’t functioning properly. Glad I spent $6500 ($7500 but talked him down $1k) to have it fixed right by a Volvo specialist.

Post by **jonesg** » 31 Jul 2020, 09:18

P0234 code is overboost, check the linkage on the wastegate.
Test the wastegate function, pull the tiny hairpin retainer and actuate the wastegate by hand.

Post by **jonesg** » 31 Jul 2020, 09:22