wire diagram 89 trooper t.c.u. HELP

I Have The Not Shiftproblem I Found The T.c.u But Need A Wire Diagram To Check Circuits Grrrrrrrrrrrrrrrr Any Help Would Be Apreciated

1989 Isuzu Truck Trooper II V6-2827cc 2.8L

Vehicle Level (http://library.alldatapro.com/alldata/LIB~C23945~R0~OD~N/0/34870075/56622299/56623602/56623604/34853741) http://library.alldatapro.com/images/a_003366.gif Technical Service Bulletins (http://library.alldatapro.com/alldata/LIB~C23945~R0~OD~N/0/34870075/56622299/56623602/56623604/34853741/34850750) http://library.alldatapro.com/images/a_003366.gif All Technical Service Bulletins (http://library.alldatapro.com/alldata/LIB~C23945~R0~OD~N/0/34870075/56622299/56623602/56623604/34853741/34850750/42063452) http://library.alldatapro.com/images/arrow1.gif A/T - Engine Vacuum Testing (http://library.alldatapro.com/alldata/LIB~C23945~R0~OD~N/0/34870075/56622299/56623602/56623604/34853741/34850750/42063452/119297925) http://library.alldatapro.com/images/arrow2.gifThe TCU is solid state and I would recommend NOT messing with it, as it is easily damaged. As you suspect, I would look for other causes. Here are a couple more Bulletins on your vehicle for the V6 engine. Does your gearshift selector and dash indicator lights both show the same position? Sometimes the transmission position switch becomes dried out or mis aligned. YOu could carefully remove and check connection, and internals for cleanliness and lightly grease then reinstall in correct position. Hope some of this helps or gives you ideas to fix. Good luck.http://library.alldatapro.com/images/blnk_spc.gif
Make sure the bulletin applies to your particular vehicle before trying it out.


A/T - Engine Vacuum TestingBULLETIN: # 028
DATE: October 1990
SUBJECT: Engine Testing With A Vacuum Gauge
TRANSMISSION: All
Engine Testing With A Vacuum Gauge
ENGINE/TRANSMISSION RELATIONS
An important part of transmission diagnosis is to make certain the engine operates properly. If the engine performance is incorrect, the transmission will receive the wrong information.
The engine sends signals to the transmission through a vacuum line, throttle cable or both. These signals basically synchronize torque with transmission line pressure, shift feel and shift timing.
Malfunctions in items like the air filter, spark plugs, EGR valves and other parts of the fuel, electrical and emission systems could result in improper transmission performance.

TSB 89-24 (Sept.)
SUBJECT: TOYOTA A-140E
PROBLEM:
Early, stacked shifts at medium to heavy throttle, Wrong gear (http://library.alldatapro.com/alldata/LIB~C23945~R0~OD~N/0/34870075/56622299/56623602/56623604/34853741/34860071/56233126/56234061) starts at medium to heavy throttle. (Works normal at light to medium throttle)
CAUSE: Solenoids may be partially restricted
SOLENOID TEST:
An easy way to test the solenoids is to raise the drive wheels, run the car with the gear (http://library.alldatapro.com/alldata/LIB~C23945~R0~OD~N/0/34870075/56622299/56623602/56623604/34853741/34860071/56233126/56234061) selector in 2nd (both solenoids are energized), and then pull the TV cable all the way to maximum pressure.
(Note: Anytime you are checking maximum pressures, make sure engine rpm's are at least 1,000 to 1,200 rpm's).
After pulling the cable, if the transmission shifts to first gear (http://library.alldatapro.com/alldata/LIB~C23945~R0~OD~N/0/34870075/56622299/56623602/56623604/34853741/34860071/56233126/56234061), then the # 2 solenoid is restricted.
If it shifts to 3rd, then the # 1 solenoid is restricted. If it shifts to 4th, then both solenoids are restricted.
The # 1 solenoid is the one with one mounting bracket, and it is connected to the white wire.
The # 2 solenoid is the one with two mounting brackets, and it is connected to the black wire.
Note This procedure also works with the A43DE, the A-340E and the A240E.



VACUUM GAUGE ENGINE PERFORMANCE TESTING
A vacuum gauge shows the difference between outside atmospheric pressure and the amount of vacuum present in the intake manifold.
The pistons in the engine serve as suction pumps and the amount of vacuum they create is affected by the related actions of:
^Piston rings
^Valves
^Ignition system
^Fuel control system
^Other parts affecting the combustion process (emission devices, etc.).
Each has a characteristic effect on vacuum and you judge their performance by watching variations from normal.
It is important to judge engine performance by the general location and action of the needle on a vacuum gauge, rather than just by a vacuum reading. Gauge readings which may be found are as follows:
NORMAL ENGINE OPERATION
http://library.alldatapro.com/alldata/LIB~C23945~R0~OB0~P3R0H~N/0/34870075/56622299/56623602/56623604/34853741/34850750/42063452/119297925/42079339/41765147
At idling speed, an engine at sea level should show a steady vacuum reading between 14" and 22" HG. A quick opening and closing of the throttle should cause vacuum to drop below 5" then rebound to 23" or more. See figure 1.
GENERAL IGNITION TROUBLES OR STICKING VALVES
http://library.alldatapro.com/alldata/LIB~C23945~R0~OB0~P3R0H~N/0/34870075/56622299/56623602/56623604/34853741/34850750/42063452/119297925/42079339/41765148
With the engine idling, continued fluctuation of 1 to 2 inches may indicate an ignition problem. Check the spark plugs, spark plug gap, primary ignition circuit, high tension cables, distributor cap or ignition coil. Fluctuations of 3 to 4 inches may be sticking valves. See figure 2.
INTAKE SYSTEM LEAKAGE, VALVE TIMING, OR LOW COMPRESSION
http://library.alldatapro.com/alldata/LIB~C23945~R0~OB0~P3R0H~N/0/34870075/56622299/56623602/56623604/34853741/34850750/42063452/119297925/42079339/41765149
A vacuum reading at idle much lower than normal can indicate leakage through intake manifold gaskets, manifold-to-carburetor gaskets, vacuum brakes or the vacuum modulator. Low readings could also be very late valve timing or worn piston rings. See figure 3.
EXHAUST BACK PRESSURE
Starting with the engine at idle, slowly increase engine speed to 3000 RPM, engine vacuum should be equal to or higher than idle vacuum at 3000 RPM.
If vacuum decreases at higher engine RPM's, an excessive exhaust back pressure is probably present.
CYLINDER HEAD GASKET LEAKAGE
http://library.alldatapro.com/alldata/LIB~C23945~R0~OB0~P3R0H~N/0/34870075/56622299/56623602/56623604/34853741/34850750/42063452/119297925/42079339/41765150
With the engine Idling, the vacuum gauge pointer will drop sharply, every time the leak occurs. The drop will be from the steady reading shown by the pointer to a reading of 10" to 12" Hg or less. If the leak Is between two cylinders, the drop will be much greater. You can determine the location of the leak by compression tests. See figure 4.
FUEL CONTROL SYSTEM TROUBLES
All other systems in an engine must be functioning properly before you check the fuel control system as a cause for poor engine performance. If the pointer has a slow floating motion of 4 to 5 inches - you should check the fuel control.
BULLETIN RECAP
^Engine problems can affect transmission performance.
^If you suspect an engine problem, connect a vacuum gauge to the intake manifold.
^Note the location and action of the vacuum gauge needle.
^Use the information in the bulletin to determine the engine problem.
^Correct the engine problem before doing extensive calibration work on the transmission.