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Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14324
Experience:  Toyota Master Diagnostic
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Check engine, vsc and 4wd lights stay on my 2006 Toyota Rav4

Resolved Question:

Check engine, vsc and 4wd lights stay on my 2006 Toyota Rav4 V6. Check engine light occasionally flashes. Started just after last gas fill-up. Codes" 300, 301, 302, 303, 304, 305, 306 and 354.
Submitted: 6 years ago.
Category: Toyota
Expert:  Skyvisions replied 6 years ago.

How many miles do you have on this vehicle? Have you had any recent service work done or can you give me any history on the vehicle leading up to this problem?



Customer: replied 6 years ago.
The Rav4 has 55,000 miles. The last oil change was at 51500. No other recent service. When standing at stop light last night, the engine started to surge a little as the check engine light began to flash. The flashing stopped about a minute later after the vehicle was moving again.
Customer: replied 6 years ago.
Battery was changed 2 mos ago and front brake pads replaced about the same time, if that is of any help.
Expert:  Skyvisions replied 6 years ago.

The P0300 through P0306 are all for each one of the cylinder misfires. My main concern at this point would be for the P0354 which deals with the primary circuit of cylinder number 4 ignition coil. This should not affect the other cylinders misfiring however if there is any type of weird short or voltage surges it could potentially create problems with the other cylinders. Cylinder number four is the middle coil/cylinder if you are standing at the front bumper looking under the hood with the large plastic cover removed from the top of the engine. If you do not have any test equipment is difficult to definitively diagnose this. However to pay someone $100 or better to diagnose something is about the cost of one ignition coil. 90% of the time when you get a primary ignition coil malfunction code as you have with the P0354 code. This code normally sets when the computer does not see ignition coil confirmation or the IGF signal. The ignition coil for cylinder number 4 is relatively easy to change one electrical connector and 1 10 mm bolt hold it in place. You could swap it with another cylinder and this would confirm if the coil was bad because you would then get a primary ignition coil malfunction for the cylinder that you swap the two. If the check engine light is flashing you want to try and avoid to drive this vehicle as little as possible because you can cause catalytic converter damaged if the unburned fuel overheats the catalytic converter due to the misfire.



Edited by Skyvisions on 1/8/2010 at 5:03 PM EST
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