Liam2ZZ Posted July 3, 2020 Report Share Posted July 3, 2020 Hi guys, I've got a Toyota Corolla with the 2ZZ-GE in it and i'm running it on a Link G4 Monsoon. It's an all out race car so no need for the creature comforts etc. My problem is that I cannot get the 'VVT Timing' to work on Aux 1. 'VVT Lift' is assigned to Aux 4 and works. If i do a manual test of the OCV solenoid (Oil control valve) it clicks away happily and you get the 'ON' status, but when you run the car it stays off. The target varies due to throttle position but actual cam position doesn't change. I've tried 3 different solenoids, tried 2 VVT actuators in case the engine builder had left it locked when installing on the cam. The 2zz trigger set up works on the 2nz-fe, I've tried the VVT set up with the 1zz option and still doesn't work. Help as it's driving me nuts. All the best, Liam. monsoon2zz.pclr 2zznovvt.llg Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 3, 2020 Report Share Posted July 3, 2020 6 hours ago, Liam2ZZ said: it clicks away happily and you get the 'ON' status, but when you run the car it stays off. The aux output runtime will always show off for PWM functions. The on/off status only works for basic on/off functions like fuel pump etc. I assume you have already done the cam angle test to check your offset? If not start by doing that to ensure the reported position is correct. But I suspect your cam is mechanically stuck. You can see in the log the ecu is sending max DC to the solenoid the whole time, then towards the end of the log the cam position suddenly jumps up to 42deg and the RPM changes. The ecu then drops duty cycle trying to pull the cam back to minimum and it doesnt return immediately either. One test you can do is run the engine at idle or just above, the set aux 1 to test pwm, if the RPM and note doesnt change then your cam is not moving. Quote Link to comment Share on other sites More sharing options...
Liam2ZZ Posted July 3, 2020 Author Report Share Posted July 3, 2020 Hi Adam, I initially thought the vvt actuator was stuck so I removed it and refitted it using the unlock / locking procedure. I've tried the test with engine running on 'test' but not pwm test, and the revs pick up. I'll try the pwm test in the morning. I know the values in the vvt table aren't correct but it was populated to see if the cam would move at all. The cam angle test came back at 51.3 deg but the tuner had put 50 deg in there so I've not changed that. At the end of the log is when I put aux 1 onto 'test' Cheers. Quote Link to comment Share on other sites More sharing options...
Liam2ZZ Posted July 4, 2020 Author Report Share Posted July 4, 2020 OK, I've changed the vvt actuator on the front of the cam. I put AUX 1 into 'Test PWM' and the status light comes on and the revs change. Turn off / back to vvt solenoid and the revs drop. I changed the solenoid frequency setting to 250 hz and it started working, then it stopped, changed back to 300hz and started working again then stopped, went to 275hz and started working again. Unfortunately I don't have any info on the factory frequency of the solenoids. I'll check again later to see if it still operates or not. Quote Link to comment Share on other sites More sharing options...
Liam2ZZ Posted July 5, 2020 Author Report Share Posted July 5, 2020 What I've got happening now is when I run the car, vvt doesn't work. I change the solenoid frequency and vvt works. I turn the car off and when I put it back on the vvt stops working until I change the solenoid frequency again. The whole thing repeats on and on and on. I've done a store to ecu every time I change the frequency. Why is this happening? Bit of an odd one. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 5, 2020 Report Share Posted July 5, 2020 Oh, I see the problem. You have both Aux 1 and Aux 4 set to L/H Inlet VVT cam solenoid. Your label on aux 4 was hiding that. So Aux 4 is not a VVT solenoid, this should be set to "Cam switched". Quote Link to comment Share on other sites More sharing options...
Liam2ZZ Posted July 5, 2020 Author Report Share Posted July 5, 2020 OK I'll try that, I assume that's in the drop down box in the aux 4 set up? The solenoid on Aux 4 that controls 'Lift' is identical to the solenoid the controls vvt on Aux 1. I'll report back once I've had a look. Quote Link to comment Share on other sites More sharing options...
Liam2ZZ Posted July 5, 2020 Author Report Share Posted July 5, 2020 OK it seems like that has done the trick! Car runs like crap now as its been tuned on the high lobe lol, But vvt is working for now and lift point has been set to 5750 rpm so fingers crossed all will be well! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.