Hey all!

First, I have misplaced my book 2 of the FSM, which might yield the answer to my inquiry. One reason I post this is because I'll probably find it after getting the answer and won't need it (for now) anymore!

I've have/had Code H26 for a while now. Clear it and it'll be back on within a minute after starting the car. I checked (after breaking one of the stems for the hoses) the old solenoid and it would not click/open even with direct battery connection. So I purchased a new one and thought that to be an easy fix. Installed and within a minute the light is on. I checked it and it clicks/opens with a direct battery feed. So then I check the wiring plug and it gives ~12 V with the switch on. I plug it into the solenoid and nothing, no click. I then strip the wires and with the harness unplugged I get the 12 V; however, as soon as I plug it into the solenoid voltage drops quickly to zero. I then cut the green (ground) and left the red + wire attached. I then took the green wire plugged into the solenoid and attach it to ground and the solenoid clicks/opens properly getting + from the harness and - from ground. I drive it and the code still is thrown, I guess due to the green (ground) not being connected; however, I do believe the solenoid is working as I no longer smell gas after driving it.

Anyone care to take a stab at this?

Thanks!

 

The PCM grounds the Dark Green/White wire to enable the solenoid.

A PCM circuit monitors the voltage of the Dark Green/White wire.
When the solenoid is not enabled the voltage on the Dark Green/White
wire will be close to 12 volts.

When the PCM grounds the Dark Green/White wire the voltage will be
close to zero. The Pink wire will always have 12 volts on it when
the ignition switch is in run or start.

The solenoid is only enabled under certain conditions which are
listed in the second diagram. If you manually ground the solenoid
DTC 26 will set because the PCM does not expect the Dark Green/
White wire to be grounded.

 

Thanks Hooked on Vettes!! I got your reply yesterday evening and disconnected my manual ground and wired the dk. green/white wire back up correctly. I was not going out anymore yesterday so i went inside, moved a pile of clothes for laundry and there was Book 2 FSM!

Anyway I drove the 22 miles to work this morning and the H26 did not set. I suspect when it set Saturday after installing the new solenoid was due to a bad connection, the locking tab broke off many years ago.

Again thanks and now I need to tackle H44 and H32. It get to travel 2 minutes/miles before the SES illuminates now!