You can look at the pulse-width of the sensor and line pressure. If the
sensor isn't showing 1psi per mph from 0-30mph, it's bad (very common
problem). As for using the HVAC gauge, I wouldn't run ATF through that
gauge. You can use a fuel pressure gauge (0-100psi) and use the line taps
on the side of the transmission.
- Bernd
-----Original Message-----
From: Steve Preston [mailto:steveophonic@yahoo.com]
Sent: Friday, July 20, 2007 8:37 PM
To: dakota-truck@dakota-truck.net
Subject: DML: Checking transmission line pressure
Sup!
I need to determine which is bad: the governor
pressure sensor,or the solenoid. I'd hate to spend the
considerable sum for a part that I don't need,if only
one of them is bad. I've read that if the line
pressure doesn't equate to 1 psi per mph as I
drive,the transducer is bad,and if the pressure is
right,the sensor is causing the problem. This is on my
work truck (2003 3.9 CC 42RE)
that runs crappy (feels like engine miss and doesn't
want to upshift unless I back off the gas.) I spent
this afternoon checking the ignition system,and I'm
fairly sure the engine isn't causing it.
First off,what's a wet gauge? I assume it measures
transmission fluid pressure? Does anyone know if an
HVAC suction side pressure gauge would work?
I want to do some actual troubleshooting and track
this problem down. Unfortunately,my scanner doesn't do
anything but engine sensors,and I haven't been able to
find anything wrong there.
Thanks,
Steve P.
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