maybe i misunderstood you when you were explaining the switch to voltage you said when the switch is closed you would get 0 volts showing then when you did the actual test when you energized it it showed actual voltage so i gues my question is how to you get voltage on same polarity when switch is open there is no ground and the way you showed it on the board you would never show voltage on meter
@zachattack42289 With no oil pressure the VTEC switch is closed which pulls the signal voltage to ground. When the VTEC solenoid is energized, the oil pressure opens the switch and signal voltage goes high (12 in this case). Don't get the solenoid and switch mixed up. When the solenoid is "on", the VTEC switch is open (12v signal). When the solenoid is "off", the VTEC switch is closed (0v signal). Hopefully I cleared that up, let me know
Hi, I have a question about my vtec operation, that maybe you can answer , about my 1998 Honda Accord EX V6.
I havent owned the car very long, but when I hit the throttle to kick in the Vtec, it stalls..
I have to go thru all of these checks but the first thing i noticed is that my voltage is over 15 volts . do you think that that could be too much voltage for the solenoid ?
@jlawrodgers Over 15 volts is not good at about 15.5 volts you will start to cook the battery. What is voltage at the battery at 1500-2000RPM in park?
Does is stall like someone shut the key off or does it bog and then stall?
@jlawrodgers Ok, system voltage sounds good. You need to shift your focus away from the V-Tech system and check your fuel pressure and exhaust backpressure. It sounds like you may be either starving for fuel or you have a restricted exhaust. Of course it could be other things too, but I would start there. BTW both of these testing methods are in my book. Fuel pressure should not drop under load (when you hit the throttle) and exhaust backpressure should = no more than 2psi@3000rpm
if Vtec system malfunction will it cause the RPM to Flush while driving and Stall? And did you say if there oil in the Vtec solenoid connector , should i change the solenoid? this happen on my 04 honda accord .....
Just to clear this up and correct me if I'm wrong the VTEC oil pressure switch only sees oil pressure when the VTEC solenoid is activated.
The 12V supply with the VTEC solenoid off is being pulled to ground by the normally closed switch (no oil pressure) so you read 0 volts on the signal wire.
When the solenoid is activated the switch is exposed to oil pressure which opens the switch disconnecting the path to ground allowing the 12V supply to come back up.
So how was it getting the bottom bolt out of the solenoid body?
I remember my first time doing that on an Accord with a leaky gasket between the head and the valve body. I had done it a few times on Civics prior and thought it would be cake. Not on an Accord it was an F22B1 engine just like that one.
It seems some engineer thought it would be funny if you had to remove the coolant inlet to get at the bottom bolt and even then you need a U joint to get a socket on it.
hello i have honda civic 1999 ex and i want to know when i start my car it feels like my exhaust is backfireing and my solenoid is leaking.
phine009 2 weeks ago
WOW! This is an excellent video. Very informative!
contagiousFX 4 weeks ago
maybe i misunderstood you when you were explaining the switch to voltage you said when the switch is closed you would get 0 volts showing then when you did the actual test when you energized it it showed actual voltage so i gues my question is how to you get voltage on same polarity when switch is open there is no ground and the way you showed it on the board you would never show voltage on meter
zachattack42289 1 month ago
@zachattack42289 With no oil pressure the VTEC switch is closed which pulls the signal voltage to ground. When the VTEC solenoid is energized, the oil pressure opens the switch and signal voltage goes high (12 in this case). Don't get the solenoid and switch mixed up. When the solenoid is "on", the VTEC switch is open (12v signal). When the solenoid is "off", the VTEC switch is closed (0v signal). Hopefully I cleared that up, let me know
ScannerDanner 1 month ago
Hi, I have a question about my vtec operation, that maybe you can answer , about my 1998 Honda Accord EX V6.
I havent owned the car very long, but when I hit the throttle to kick in the Vtec, it stalls..
I have to go thru all of these checks but the first thing i noticed is that my voltage is over 15 volts . do you think that that could be too much voltage for the solenoid ?
thanks for any help.
jlawrodgers 1 month ago
@jlawrodgers Over 15 volts is not good at about 15.5 volts you will start to cook the battery. What is voltage at the battery at 1500-2000RPM in park?
Does is stall like someone shut the key off or does it bog and then stall?
ScannerDanner 1 month ago
@ScannerDanner The Voltage at idle is 15.04 .at about 1500-2000 ,it actually drops to 14.78 .
as far as the vtec problem,when I hit the throttle , it bogs down,and then stalls, then comes back to "life" when I back off the throttle.
besides that ,it runs just fine.
thanks ,again for your input
jlawrodgers 1 month ago
@jlawrodgers Ok, system voltage sounds good. You need to shift your focus away from the V-Tech system and check your fuel pressure and exhaust backpressure. It sounds like you may be either starving for fuel or you have a restricted exhaust. Of course it could be other things too, but I would start there. BTW both of these testing methods are in my book. Fuel pressure should not drop under load (when you hit the throttle) and exhaust backpressure should = no more than 2psi@3000rpm
ScannerDanner 1 month ago
@ScannerDanner
I had to pull the intake to fix an egr blockage problem and since then, it has been running good..
thanks for the replys and help !
jlawrodgers 1 month ago
im getting the same code p1259 on a 2001 honda civic ex
hp11208 1 month ago
if Vtec system malfunction will it cause the RPM to Flush while driving and Stall? And did you say if there oil in the Vtec solenoid connector , should i change the solenoid? this happen on my 04 honda accord .....
vietcong4u 1 month ago
Just to clear this up and correct me if I'm wrong the VTEC oil pressure switch only sees oil pressure when the VTEC solenoid is activated.
The 12V supply with the VTEC solenoid off is being pulled to ground by the normally closed switch (no oil pressure) so you read 0 volts on the signal wire.
When the solenoid is activated the switch is exposed to oil pressure which opens the switch disconnecting the path to ground allowing the 12V supply to come back up.
Bushougoma 4 months ago
@Bushougoma That was a great description and exactly correct. Nice job
ScannerDanner 4 months ago
So how was it getting the bottom bolt out of the solenoid body?
I remember my first time doing that on an Accord with a leaky gasket between the head and the valve body. I had done it a few times on Civics prior and thought it would be cake. Not on an Accord it was an F22B1 engine just like that one.
It seems some engineer thought it would be funny if you had to remove the coolant inlet to get at the bottom bolt and even then you need a U joint to get a socket on it.
Bushougoma 4 months ago
first step check oil level in engine
ant1986fel 6 months ago
@ant1986fel good point! forgot to add that thanks
ScannerDanner 6 months ago
Love the video very helpfull
Joseq140 7 months ago