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Hi guys I need help I have a 01 civic 5 speed with the 1.7 vtec motor with around 175000 miles. My car is in safe mode and I had it put on a scanner it said it was the vtec solenoid Now I replaced the solenoid did a tune up and oil change and reset the computer with a scanner and it comes out of safe mode I can rev motor to red line but as soon as I start to drive the light pops on and I can’t rev over 4000 rpms Any thoughts or advise of what should be my next step or what else could it be anywhere I call wants me to bring it in and get a dyno test done but want to charge me a arm and a leg to do so Any help would be greatly appreciated

 
Rep Power: 228

Any recent modifications, replaced parts or services?

 
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No just the vtec solenoid and tune up oil change I erased code with a scanner but when I start to drive it goes right back to safe mode

 
Rep Power: 228

The oil is 5w20, and it's in the safe zone on the stick, right, not high or low?

The vtec system is engine oil governed as you may know.

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Also after resetting the codes with a scanner, have you tested the wires to the vtec solinoid for signal?

 
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The oil is 5w-20 at perfect level I haven’t tested the new solenoid how would I go about doing that with a ohm reader right? I am not exactly a mechanic but I’m no dummy either

 
Rep Power: 228

No, if the solinoid if new, from Honda, should be fine.

You should check the wires to the solinoid from ecu, for control voltage.

 
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Yes the solenoid was new I’ll check the wires leading to it is there a certain voltage it should read and I’ll check them get back with you I appreciate your help with this

 
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Ok I checked the solenoid wires I am getting a reading of 12 from ecu

 
Rep Power: 228

The 12v was when you were driving, above 3400rpm, throttle 80%+?

You should not have voltage to the solinoid at idle. I was thinking you would test resistance from solinoid wire to solinoid exterior, and continuity from the wire from ecu yo solinoid.

I'm not 100%, but I think the circuit goes

Battery 12v+--->relays/fuses--->ecu--->vtec control wire--->grounded back to battery via vtec solinoid connection to head.


On a side note, when you replaced the solenoid, you replaced the whole unit right not just the top solinoid but the lower part of the valve? The reason I ask is just to make sure the oil screen is new or clean.


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If all checks out from ecu to solinoid, then the last possibility is that some how a vtec control pin, inside the valve assembly, is stuck (possibly from carbon build up). Though this would be pretty hard to accomplish.

 
Rep Power: 132

New VTEC solenoid is a Honda OEM?