Z31 Fuel Injector Differences, ECU and O2 sensor and Interchange Information

This information has been put together for ECU/injector/O2 sensor interchange information. This should be particularly useful for those swapping an 88-89 ECU into their car. As these are the only major differences in the Z31's stock engine management, this should be what you need to figure out if a particular configuration will work for you.

Fuel Injector http://www.xenonzcar.com/z31/images





Interchange Information

Z31 engine control computer system (ECCS), o2 sensor, and fuel injector interchange information

There is absolutely no difference between a regular 88 Turbo ECU and an "88SS" ECU. There is nothing special about a ECU branded "88 Shiro" or otherwise, it's a marketing ploy to make it SEEM more desirable.

All NA injectors are ~180cc/min and all Turbo injectors are ~260cc/min, the ECUs are programmed accordingly.

High impedance ECU on a low impedance injector will require installing six 6 to 10ohm 10W dropping resistors to keep from frying the injector driver units. If dropping resistors are to be installed, the fuel injectors must be wired back to the factory (pre-service campaign) wiring

Low impedance ECU driving a high impedance injector should operate normally.

Feed type does not matter to the ECU as impedance and flow rating do, however the lower intake manifolds are different and will require shaving/shimming the injector mounting area for fitment if your engine came with the other type of rails/injectors.

Titania-type oxygen sensors are not compatible with zirconium type, and vise versa. Zirconium sensors relay a 0-1v signal and Titania sensors vary resistance to give the ECU its mixture feedback data. If you wanted to switch sensors to accommodate a 86-89T ECU, the wiring in the engine wiring harness would need to be changed, as well as the oxygen sensor bung (Titania are 17MM and Zirconium are 22MM).

CALifornia and FEDeral ECUs can interchange. The only known physical difference in the CAL version is the presence of an EGT sensor.

The PROM chip on 88-89 NA and turbo ECUs can be swapped. That is, if you want an 88-89 ECU and would like to use a Zirconium type oxygen sensor you can put the turbo PROM in the NA ECU. This should save a lot of time in swapping out the sensor bung, sensor, and re-wiring. Hence, the desirable unit for 84-85T cars would be an 88-89NA ECU, and the desirable unit for 86-89T cars would be the 88-89T ECU.

The Turbo ECU has a daughter-board for the detonation sensor, Non-turbos do not. (Note: the TP/RPM feedback region for the detonation sensor is very small, it is not even used under boost or at any time above 3000RPM.)

The Turbo and Non-turbo cars do not use the same type of idle control. The wiring in the engine harness is also different for these controls. Not really an issue: I, and many others have perfectly running cars with all idle control devices removed.

88-89 Turbo ECUs have a timing map that runs more timing under boost on account of the smaller (T25) turbocharger only running 4-5PSI boost pressure. Keep this in mind if swapping.

84-85 ECUs (all) have been reported to have a small lean surge problem during the first 30 seconds or so of engine warm up. This is most likely an issue with the cold-start enrichment and can be remedied by switching from CHTS to FTS signal during startup.



ECCU lookup


To Lookup your ecu or interchange for ECU,O2, Fuel Injectors, Complete one of the search boxes and click submit. Only one search below can be run at a time.
Search By NMC number

Search By JECS number


Search By Model


ECU can have a NMC number or a JECS number the numbers
are listed as NMC/JECS these are interchangeable.



Non USDM ECUs

If your ECU is not listed above you will have a Euro Or JDM ECU.

Below is a chart of these ECUs

If it has an alternate part number, that means the part interchanges between the two and vice versa.

These numbers are strictly pulled from the Euro and JDM FAST parts catalogs. It does not list the JECS number, only the Nissan part number.

  • 23710- is the first part of the part number for all factory ECUs.
  • 2371M- indicates Nissan remanufactured part number.
  • END means the end of the model run.
  • ??? means FAST does not specify which transmission combination.

  • JDM Z31 ECU part numbers

    Part Number

    Date Range

    Engine

    Transmission

    Alt Part Number

    12P01

    9/83 - 10/86

    VG20ET

    5 speed manual

    N/A

    12P11

    9/83 - 10/86

    VG20ET

    Automatic

    N/A

    15P00

    9/83 - 10/86

    VG30ET

    5 speed manual

    N/A

    15P10

    9/83 - 10/86

    VG30ET

    Automatic

    N/A

    20P01

    10/85 - 10/86

    RB20DET

    ???

    N/A

    20P60

    10/86 - 7/87

    RB20DET

    5 speed manual

    20P61

    20P61

    7/87 - END

    RB20DET

    5 speed manual

    N/A

    20P70

    10/86 - 8/87

    RB20DET

    Automatic

    20P71

    20P71

    8/87 - END

    RB20DET

    Automatic

    N/A

    22P00

    10/86 - 7/87

    VG30DE

    5 speed manual

    22P01

    22P01

    7/87 - END

    VG30DE

    5 speed manual

    N/A

    22P10

    10/86 - 8/87

    VG30DE

    Automatic

    22P11

    22P11

    8/87 - END

    VG30DE

    Automatic

    N/A

    22P72

    10/86 - END

    VG30ET

    Automatic

    N/A


    EURO Z31 ECU part numbers

    Part Number

    Date Range

    Engine

    Transmission

    Alt Part Number

    Country

    06P00

    1/84 - 7/85

    VG30E

    5 Speed Manual

    06P01

    N/A

    06P01

    7/85 - END

    VG30E

    5 Speed Manual

    N/A

    N/A

    06P05

    1/84 - 7/85

    VG30E

    5 Speed Manual

    N/A

    Switzerland/Sweden

    06P06

    7/85 - 2/87

    VG30E

    5 Speed Manual

    N/A

    Switzerland/Sweden

    06P10

    1/84 - 7/85

    VG30E

    Automatic

    06P11

    N/A

    06P11

    7/85 - END

    VG30E

    Automatic

    N/A

    N/A

    06P16

    7/85 - 2/87

    VG30E

    Automatic

    N/A

    Switzerland/Sweden w/anti-pollution controls

    07P00

    1/84 - END

    VG30ET

    ???

    N/A

    NOTE 1

    23P00

    2/87 - END

    VG30ET

    ???

    N/A

    NOTE 2


  • NOTE 1 - for Europe except West Germany, Holland, Switzerland, and Austria
  • NOTE 2 - for West Germany, Holland, Switzerland, and Austria
  • Europe had different emission standards for different countries at the time, hence the difference in part numbers for countries


    Sources used on this page: