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PO741 VSC, 4WD, engine light BUT performance and shifting are no different

1469 Views 10 Replies 7 Participants Last post by  Littlefishy
My 2007 RAV4 is a 4 cylinder 4WD and has 228,000 miles on it, has lights lit on the dash: VSC, 4WD and check engine. The diagnostic code is PO741, However, the engine performance and shifting are no different. I am thinking that the code is due to somewhere in the wiring there is an error keeping the TCC from engaging.

I have parked it and I have been driving my second vehicle. But I am thinking about just driving it with the lights on the dash. Any ideas about how to proceed?

The vehicle and Toyota rebuilt the engine a few years ago at no cost to me due to oil leakage. It has rust and dents. But is has been reliable and cheap to operate.
Advance Auto Parts showed me a solenoid for $383, but it looks like lots of work to get at in and there are four solenoids so which one is the bad one? Too much work for me to take it apart, find the bad one and replace it. I have an independent mechanic I used to replace O2 sensor and some other stuff, but it seems like it could be hundreds of dollars. So far I have noticed anything negative. Should I just drive it till it quits and junk it?
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Discussion Starter · #7 ·
The factory service manual will list the diagnosis tree based on the code you reported. Some codes have a crazy long trouble shooting route, others not so bad. BUT, proper diagnosis is critical, otherwise viva la parts cannon.

I don't think Chilton/Haynes provide the same diagnosis tree.
I spent a few research on the Internet yesterday. PO741 is either Torque Convert Clutch circuit performance OR stiuck in OFF.
One source said "somewhere in the wiring there is an error keeping the TCC from engaging."
 

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Discussion Starter · #9 ·
P0741 codes can be caused by

Low transmission fluid level
Dirty transmission fluid
Faulty torque converter clutch solenoid valve
Torque converter clutch solenoid valve harness or connectors
Torque converter clutch solenoid valve circuit is open or shorted
Transmission internal mechanical problem

Do you know the tranny service history? I would check the tranny oil level and condition first, and if it is low/dirty, change the oil and filter. It could be the dirty oil has clogged the solenoid filter BTW.

I would also do a visual inspection of the harness from the tranny to the ECU - look for damage or green crusties on the wires or connectors.

After this, you are probably looking at internal work
Thanks Bigphil555 that is good advice to start simple things like low fluid level. I know the service history because I have owned it since 74,000. I had the tranny flushed in 2015. Checking the harness is a good idea. I will have to look it to see where it is. THANKS for the HELP
 
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