93 trooper weird tranny slipping problem

[s_neiss]

Hello~

I've got a '93 trooper and the transmission is slipping out when I come to a stop. The problem appears to happen randomly. We just relocated to a new state, and I left my old mechanic (who I trusted completely) behind. I took it in, and was told my force motor control solenoid was going out. It was replaced, and we thought we'd be all set, but the problem has not gone away, but the frequency has diminished. Any ideas? I was told the transmission itself looked fine.

Any help would be GREATLY appreciated!

Thank you.

[trooperbc]

can you call your old trusty mechanic for his long-distant opinion, since he has some history on the vehicle?

i can tell you that slipping is something to get on, because it only leads to more problems. did the current shop mention the condition of the fluid and/or filter. i assume they changed both, which would be the first step.

AND for the record, how many miles on the odometer? thanx

//bc

[s_neiss]

I've already called my old mechanic, but fortunately (unfortunately?), my trooper had never had a transmission problem prior to this, so he couldn't do more than verify the code that the new guy said he got from the diagnostic. And, for the record I've got 147,000 miles on it... & it's been a terrific vehicle up to this point for us.

The new guy checked to make sure I didn't have any metal in the pan prior to replacing the solenoid and replaced the fluid/filter.

[trooperbc]

ok.....what was the code?

//bc

[s_neiss]

Code 33.

[atfdmike]

1993 Isuzu Truck Trooper (4 Door) V6-3165cc 3.2L SOHC (6VD1)

Vehicle Level Transmission and Drivetrain Transmission Control Systems Testing and Inspection Testing and Inspection Procedures Trouble Code Diagnostic Charts Code 33 Code 33CIRCUIT DESCRIPTION
The force motor solenoid is a variable position solenoid whose plunger moves in relation to the current received from the TCM. The TCM uses the force motor solenoid to control line pressure. By changing the line pressure, the TCM controls gear shifts. The TCM determines the proper gear by using electronic inputs to read engine load, engine speed, and vehicle speed. As operating conditions change, the TCM changes the plunger's position by varying the amount of current (amperage) sent through the solenoid.

Line pressure can vary from less than 50 psi to more than 200 psi. The line pressure varies inversely to the amount of current. High current causes low pressure and low current causes high pressure.

TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.

1. This test determines if the solenoid windings or wires to the solenoid are open.
2. This test determines if the wiring to terminals 40 and/or 41 of the TCM connector are shorted to voltage.
3. This test determines if the wire between terminal 40 of the TCM connector and the adapter case connector is shorted to voltage.
4. This test determines if the wire at terminal 2(B) of the adapter case connector is shorted to voltage.

DIAGNOSTIC AIDS
Trouble Code 33 sets when the TCM detects a current draw greater than 1.5 amps between terminals 40 and 41. In the event of an electrical failure, the force motor solenoid is turned off, allowing maximum fluid pressure.

CIRCUIT DIAGRAM
Force Motor Solenoid Circuit

CODE 33 DIAGNOSTIC CHART
Code 33 Diagnostic Chart

[janice_budd]

not sure myself but mine does the EXACT same thing....would also love to know why