Your symptoms are different to your explanation. Shift solenoid issue would create shifting problems ... you would hear the engine over revving when the car should shift to the next gear ... or holding too long in a gear before shifting to the next. If this is what's happening, before going at the trans with solenoids pull the dipstick and check the oil, it should be a clean red color ... if brown or black change the oil ... it may be burnt and not doing it's job correctly causing slip.
Beware of quick oil change places they do not use the correct oil ..especially in Foreign cars.
Hope this helps
Sam
SOURCE: 1990 300 zx transmission problems
I also have a 1990 300zx N/A 2+2, the transmission is computer driven, as is almost everything on the car has different computers.
1st look at the fluid and fluid level, make sure that it is red or pink, not black, smell it and if it smells burnt, you might need to replace the tranny, due to that's a bad sign of internal damage. next I would try a junk yard for the computer and try that, finally I would go to a trusted mechanic and have them diagnose your problem, unless you have a good mechanic that will diagnose the car for around $50, then go there first, due to the complexity of the transmission.
SOURCE: When appling brakes on a 2000 Jeep Grand Cherokee, steeing wheel
New revised calipers. and have the new rotors machined right out of the box before installing
SOURCE: automatic transmission will only shift manually
This is a sensor issue. It can be from a couple of different sensors. The VSS, or vehicle speed sensor is the main one. Loose or faulty wiring can cause it, a faulty PCM can cause it, or the Throttle Position Sensor can cause it.
SOURCE: where is the output speed
Hi.
The problem is either vehicle speed sensor or wiring harness going to sensor. In some case the ECM is defective.
Ensure that you have already replaced the VSS with good ones.
If
you have not replaced them yet, then the sensor can be tested reading
the waveform. This is done connecting both VSS input and output wires to
a machine. The one below is a good VSS wave at 37 mph:
If
the waveform is incorrect, the sensors must be replaced, as the ECM
returns P0722 when VSS output is incorrect, or when there is no output.
A
second test can be done reading the sensor impedance and voltage.
Connect a multi-meter to the sensor. Set first on Ohms reading
(impedance). A good sensor will read 560-680 Ohms at 20C (68F).
Set
multimeter on Volts. Touch rapidly the sensor with a magnet and pull
magnet away. The sensor will emit a weak voltage pulse. If that does not
happen, then the sensor is broken. Ensure that multimeter is on high
volt scale.Voltage will be quite low:
The VSS are located on the wheel shaft. Here a picture:
The VSS is connected to the ECM.
If you have already replaced the sensors you need to check the wiring harness to the ECM.
The wiring harness is tested checking that each wire going to the ECM
has continuity. This is done reading impedance between each connector in
the sensor , and the respective connector in the ECM. Impedance must be
zero or a very low value. If it reads infinity, then the wire is
broken.
A second test is done reading impedance between the two
different wires at ECM connector. Impedance must be the same as at VSS
contacts on sensor. If impedance is zero, then there is a short. Ensure
that you choose a proper Ohms scale while doing the test.
If you
have already replaced the VSS, repair or replace the wiring harness. The
ECM failure returning this code is very uncommon. At most you may have a
defective ECM connector.
Regards.
Ginko
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