Transmission
Automatic

Auto Transmission Diagnostics
If your automatic transmission is acting erratically, be it shifting too hard, shifting too late, shifting too early, etc. try the diagnostic to isolate the problem. The diagnostic, like the main computer diagnostic, may show an error code if it reads a sensor or circuit that is not within factory specification.

Auto Control Unit Part Numbers
A transmission control unit or TCU is a device that controls modern electronic automatic transmissions. A TCU generally uses sensors from the vehicle as well as data provided by the engine control unit (ECU) to calculate how and when to change gears in the vehicle for optimum performance, fuel economy and shift quality.

Torque Converter Stall Test Notes
If the torque converter stators one way clutch is suspected of slipping or being seized, a torque converter stall test should be performed before bench testing the converter. Always check with the vehicle’s manufacturer before performing this test.

Gearbox Install Torque Settings
Ensure all bolts are torqued correctly when installing an automatic gearbox.

RE4RO3A  Transmission
The RE4R03A is an electronically controlled transmission. That is, a separate transmission control unit (TCU) is required to facilitate transmission operation. This TCU determines the optimal shift timing based on input data from various sensors (i.e. vehicle speed, engine speed, throttle position).

Manual

General

Speed Sensor
​A lot of owners have issues with the speedometer, power steering, auto box change etc. 
All of these are related in as far as they are part of the speed sensor circuit.

Electrical
Wiring and Diagnostics

300zx ECU Codes
How to enter diagnostics mode and the meaning of the codes.

Auto Climate Control Diagnostics
One of the more complex subsystems in the Z32 is the climate control. The on-board diagnostics actually allows full readout of its data and adjustments to how it functions besides just returning error codes.

Ignition Wiring
A description of the ignition wiring for each manufacturing year.

Engine
General

Rear Crank Seal Replacement
It's recommended to replace this part as routine maintenance when the transmission is out for a clutch replacement, etc.

Timing Belt
The Timing Belt Service is perhaps the most vital and significant maintenance job for the 300ZX. Because the VG30DE(TT) is an interference engine, maintaining the timing belt system is essential.

Hydraulic Valve Lifters
Lifters can cause loud ticking noises if they fail. It is also a good idea to replace lifters during a rebuild.

Fuel Injectors
The Z32 uses high-impedance, side-feed fuel injectors. New fuel injectors ohm test at approximately 11.4 ohms. Operating range is between 10 and 14 ohms.

Axles, Suspension and Steering
Steering

HICAS Diagnostics
Turbos come standard with a 4 wheel steering system, High Capacity Actively Controlled Suspension.
​There is a visual diagnostic mode to check for problems in the HICAS functions.