low voltage at purge solenoid

[bluecalypso]

Hello.

I have a 94 SVX LSi AWD. It has a 4.44 tranny in it now. I also have the EcuTune Stage 1Av1 and the TCU computer. My check engine light is on for the purge solenoid valve. I have checked the voltage at the plug and coming from the ecu and it is 3.7 volts constant wether the CEL light is on or not.
I do not have the wire from the 1Av1 connected.

Any ideas why I'm only getting 3.7 volts?

This is my second SVX. My first one was a 92 LSL?( Been 10 years) It was 2 tone silver and black.

[oab_au]

Originally Posted by bluecalypso

Hello.

I have a 94 SVX LSi AWD. It has a 4.44 tranny in it now. I also have the EcuTune Stage 1Av1 and the TCU computer. My check engine light is on for the purge solenoid valve. I have checked the voltage at the plug and coming from the ecu and it is 3.7 volts constant wether the CEL light is on or not.
I do not have the wire from the 1Av1 connected.

Any ideas why I'm only getting 3.7 volts?

This is my second SVX. My first one was a 92 LSL?( Been 10 years) It was 2 tone silver and black.

The Purge solenoid should only get a voltage to it, when it is to work, and that will only be when the engine is at normal temp, running at a steady speed in 4th gear.
The voltage that is sent is a Duty Cycle, that won't be a constant Voltage.
The code says that the wiring to it is either open or shorted, or the solenoid is not responding to the signal.

Harvey.

[bluecalypso]

So the solenoid , when it is supposed to turn on , should be getting the 12+ volts it's supposed to. If I'm only getting 3.7 volts constant wether I'm idling or driving then my ecu is messed up, correct? Just to clarify, I'm getting the 3.7 volts with my car at normal temps.

[92snowmachine]

you could be measuring the voltage drop over a corroded wire. check the voltage at the computer itself.

[oab_au]

Originally Posted by bluecalypso

So the solenoid , when it is supposed to turn on , should be getting the 12+ volts it's supposed to. If I'm only getting 3.7 volts constant wether I'm idling or driving then my ecu is messed up, correct? Just to clarify, I'm getting the 3.7 volts with my car at normal temps.

It has battery voltage to the solenoid, 10V min.
From the other side of the solenoid to ground you should get 7V min. This just checks the power supply, and the solenoid winding.
The actually signal level when operating varies from 10V to zero.
It only works when the car is cruising, on a light throttle, as it is sucking fuel fumes into the engine.

Harvey.

[bluecalypso]

Ok. I will look into it more this weekend . Just one more quick question. What pin number is the blue/red wire when it goes into the ecu at the yellow connector b61? It's 1 thru 16 I just don't see a blue/red wire on it.

Thankyou for the help so far guys!

[oab_au]

Originally Posted by bluecalypso

Ok. I will look into it more this weekend . Just one more quick question. What pin number is the blue/red wire when it goes into the ecu at the yellow connector b61? It's 1 thru 16 I just don't see a blue/red wire on it.

Thankyou for the help so far guys!

It looks like it is plug B62, pin 6, and it is a white/red wire.

Harvey.

[bluecalypso]

Originally Posted by oab_au

It looks like it is plug B62, pin 6, and it is a white/red wire.

Harvey.

Ok. I think I know what I did wrong when I was checking the voltage. I will re-check it as soon as I can and chime back in.

Thanks!

[oab_au]

Originally Posted by bluecalypso

Ok. I think I know what I did wrong when I was checking the voltage. I will re-check it as soon as I can and chime back in.

Thanks!

OK if you check the voltage on that wire to ground, you should get the 7V min.

Harvey.

[bluecalypso]

Sorry about lapse of time, but I finally got to checking things out. It looks like it may be my ecu that is the problem. I'm going to get ahold of another one in a bit and then I'll know for sure.

[bluecalypso]

It was definately the ECU. Hard to ignore the smell of burnt electronics. The new ECU works great. Thanks for the help.!!

[oab_au]

Thank for letting us know.

Harvey.