1999 Volvo S70 Electrical question re: CVVT solenoid

denraden03 · Post by **denraden03** » 15 Feb 2016, 10:21

I purchased a new CVVT solenoid because the old one had an open circuit with code P0013. However, during my diagnostic tests with the key 'ON' I am seeing 12v at one wire (looks like green/w red tracer) at the 2 pin connector and 2v at the other wire (tan). Is that normal? I do not want to connect the new solenoid and "FRY" it. Would appreciate it if anyone can check their wiring and let me know.
Thanks.

Post by **abscate** » 15 Feb 2016, 16:04

You cant test wiring on the solenoid easily.

One side should have 12VDC but the other is internally grounded in the ECU to position the solenoid

Post by **precopster** » 16 Feb 2016, 04:54

It's quite normal for both leads to have a potential voltage. Only one terminal has to drop down to ground as abscate mentioned via the ECM to create movement of the solenoid.

denraden03 · Post by **denraden03** » 16 Feb 2016, 06:19

@abscate and precopster: I disconnected the CVVT solenoid and connected my DVOM to the (tan) wire which had 2 volts. Started the engine and the voltage drops to 0 volts when you accelerate the engine. The voltage on that wire fluctuates, causing the solenoid to energize and de-energize so the ECM is responding to the other engine parameters to activate the CVVT solenoid. I installed the new CVVT solenoid and took it out on the highway for a test run. Did about 10 miles and the CEL did not come on. No codes. So, hopefully that resolves the code P0013.
I am still having the "prolonged cranking" issue. I never had this problem prior to the engine overheating. This engine overheated to the point where the plastic cover over the coils melted. I am wondering whether the overheating messed with any of my sensors. Maybe my coolant sensor? Fuel pressure is good, 5 new coils and timing is good. So now it's a process of elimination. I will keep you informed as to my progress.
Thank you all on this forum for your help in making me understand a little more about this car.

Post by **abscate** » 16 Feb 2016, 06:51

Which side was your CVVT solenoid on, intake or exhaust?

denraden03 · Post by **denraden03** » 16 Feb 2016, 10:07

exhaust side

Post by **abscate** » 16 Feb 2016, 17:03

As soon as I remember why I asked that I'll add something useful

denraden03 · Post by **denraden03** » 17 Feb 2016, 07:03

I removed and checked my CTS this morning and here are the results:
DVOM set at 20K
@32 F ---- 6.66 K
@212F----0.21k
As per the specs on this forum
Old Sensor
On the low temp range it is close to the 7300k spec
On the high temp range it would seem to out of the 150K range. This might account for my hard start when hot
New Sensor
@32 F ---- 6.47K
@212F ---- 0.23K
Pretty much no difference, but still out of range on the hot end.
What do you guys think?

Post by **abscate** » 17 Feb 2016, 08:57

Pretty close for resistance measurements, unfortunately there are no tolerances given on these specs.

did you try to monitor the resistance as the sensor cools to see if varys smoothly??

denraden03 · Post by **denraden03** » 17 Feb 2016, 13:06

@abscate>>> yes I did and the resistance decreases and increases nice and smooth. I did not do this with the old sensor, because the readings for both the old and new sensors were very close, I opted to install the new sensor. I'll keep the old sensor as a spare. I did new sensor, thermostat and upper radiator hose.
BTW, Took the car out on the highway and the P0013 did not come back, so I'd say the CVVT issue has been resolved.
I am going tp let the car cool down and see if the prolonged cranking to start also goes away. I will post the results when I check that out.
What's with the Trini flag??? I just noticed it today, even though I have been on the forum for a while. I kinda had blinders on.