Check Engine and VSC Lights On - Toyota Nation Forum : Toyota Car and Truck Forums
Sienna 2nd Generation (2004-2010) Discussion area for the second generation Toyota Sienna.

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post #1 of 13 Old 07-11-2019, 10:01 AM Thread Starter
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Check Engine and VSC Lights On

20014 Sienna XLE LTD with 109,400 miles

Timing belt replaced ~96000 miles

While pulling out of a parking spot this morning the check engine light started intermittently flashing orange followed shortly by the Variable Speed Control light saying the system was off. Engine started running a little rough as well.Made it home and turned the engine off. Waited about five minutes and started the engine again and both warning lights are on again with the Check Engine Light constantly on (not flashing as when it first came on while driving earlier).Engine still seems to have a rough idle as well.

Any thoughts as to the most likely reason(s) before I go spending money on unneeded repairs?



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post #2 of 13 Old 07-11-2019, 10:06 AM
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Have the plugs ever been changed and if so do you know which plugs were used?

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post #3 of 13 Old 07-11-2019, 11:01 AM Thread Starter
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The three front plugs,easiest to access under the cover, were replaced at ~102k using NGK Iridium IX plugs.Done by myself and stopped trying to access the rear three after removing windshield wipers,wiper cowling etc. but uncomfortable removing additional parts needed to access the plugs easily.
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post #4 of 13 Old 07-11-2019, 11:26 AM
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You need to get the code from OBD scanner. Mine had all 3, check engine light, VSC, Trac off. It turns out it has nothing to do with VSC or Trac off. It was an oxygen sensor for me. I also made the newbie thing with zero point calibration. Which did get rid of the lights, but came back after few weeks. Definitely get the code from OBD to determine the root cause.
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post #5 of 13 Old 07-11-2019, 12:04 PM
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VSC and TRAC OFF are sympathetic to any codes which may affect engine power output, as the traction control systems modulate engine power output to get their job done (and so need to be able to predict engine power accurately).

If it was flashing steadily, that is an OBD-standard indicator that the engine is misfiring badly enough to damage the catalytic converters (or so the ECU thinks). I bet you have misfire codes set, and given the age, +1 on needing the rear spark plugs done. Whenever you get a check engine light, have the codes read and post them so we can give you a hand, since the CEL can be many things. In fact, invest in a cheap scanner or a Bluetooth OBD scanner for your phone so you can do it yourself, handy thing to have for modern cars.

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post #6 of 13 Old 07-11-2019, 02:35 PM Thread Starter
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So the OBD scanner shows the following codes: P0 304,P0 354 and P0 304 Pd.
If I am correct these are all associated with cylinder number 4 and either the spark plug or more likely a coil. If I am looking at the correct cylinder order for my particular engine,which is VVT-i 3.3L V6,cylinder number 4 is the center cylinder closest to the front of the engine compartment.As I said in my initial post I changed the 3 spark plugs closest to the front of the engine which should be cylinders 2,4 and 6 from left to right. Would I be guessing in the dark if i were to change the coil for cylinder 4 to see if that solves the problem?And i will also go ahead and change the coils for cylinders 2 and 6 so that both plugs and coils will be new. And if that does indeed solve the current problem I will have to pay the piper and take the van to a shop for replacement of plugs and coils for cylinders 1,3 and 5. Unless of course someone here on the forum has done so and has tricks for accessing them without removing too many parts.

Thanks for any replies.
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post #7 of 13 Old 07-11-2019, 02:55 PM
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One thing you can try is swap the coil/spark plug from cylinder 4 to cylinder 2. Run the OBD scanner again. If it is throwing code for cylinder 2 then you know the coil and/or spark plug is bad. The ones in the back 1, 3, 5, very tough if you try to DIY.
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post #8 of 13 Old 07-11-2019, 02:59 PM Thread Starter
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Believe it or not I was considering that but wanted to wait until someone with definite knowledge confirmed I am correct in where I believe cylinder order and location are.
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post #9 of 13 Old 07-11-2019, 06:21 PM
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Yes, cylinder 4 is the front center... move cylinder 4 coil to somewhere else and change all the plugs using NGK 4589 or Denso 3297... if the misfire persists read the codes again and see if the code moved to the cylinder you put the coil on. If it did not move then you have some other problem with cylinder 4.

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post #10 of 13 Old 07-12-2019, 02:33 AM
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Quote:
Originally Posted by pcvrx660 View Post
One thing you can try is swap the coil/spark plug from cylinder 4 to cylinder 2. Run the OBD scanner again. If it is throwing code for cylinder 2 then you know the coil and/or spark plug is bad. The ones in the back 1, 3, 5, very tough if you try to DIY.
^this. Real easy to check this, your code should change to P0352/P0302 soon after
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02 Insight 178k DC-DC BELLY-UP

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01 Viggen 112k 400 FWHP
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post #11 of 13 Old 07-12-2019, 09:01 PM
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No matter what happens you do need to get those rear plugs replaced at some point, either by you or someone else. Even if they aren't causing an issue now they will sooner or later down the line.
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post #12 of 13 Old 07-13-2019, 11:10 AM Thread Starter
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dandaman,completely agree with needing to get the rear plugs replaced and sooner than later because my luck will have them fail sooner. Will plan to replace the coils and clean the throttle body at the same time since they will both be easily accessible when changing the plugs. As for my current issue,I am attaching a picture showing what happened when I plugged the wiring harness clip back onto a replacement coil for cylinder 2. This is what happens when I try to handle repairs myself. My question is,is there any possibilty of arcing/shorting of the wire leads inside the clip with the small boots not seated.I am puzzled why three of the four came out when I plugged the clip back onto the coil. Any suggestions as to how I can get them reseated fully inside the clip?
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post #13 of 13 Old 07-14-2019, 08:29 PM
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Those are very easy to fix.

Amazon Amazon

When you get the new ones you pull out the retainer which is the white part of the business end of the plug in the photos on thatlink. You can then use a paperclip to release each individual wire from the new plug and then put the old wire into the new one. It sounds hard but is very easy, if a little tedious. So far I'm 2/10 between the Sienna and Camry for breaking those.
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