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 Images

Interchange Information

Z31 Electronic Concentrated Control System (ECCS), o2 sensor, and fuel injector interchange information

Year (s)	Type	Fuel Injector Impeadance	Fuel Injector feed style	O2 Sensor type	O2 Sensor Part number
84-85	Non-Turbo	Low	Top-Feed	Zirconium	22690-09P01
84-85	Turbo	Low	Top-Feed	Zirconium	22690-12P01
86	Non-Turbo	Low	Top-Feed	Titania	22690-19P40
86	Turbo	Low	Side/Dual-feed	Titania	22690-19P20
87	Non-Turbo	Low	Side/Dual-feed	Zirconium	22690-09P01
87	Turbo	Low	Side/Dual-feed	Titania	22690-21P11
88-89	Non-turbo	High	Side/Dual-feed	Zirconium	22690-09P01
88-89	Turbo	High	Side/Dual-feed	Titania	22690-21P11

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.

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ECCU Part Numbers Complete List Posted by Byron on September 10, 1997 at 10:52:28

ECU List from www.redz31.net.



You must be in proper group
Federal turbo or Calif turbo or Federal non turbo
or Calif nonturbo.
Then look under proper transmission.
ECU can have a NMC number or a JECS number the numbers
are listed as NMC/JECS these are interchangeable.

Federal Turbo 5spd NMC/JECS
• 1984 23710-02P02/A18-617370
• 1984 23710-02P03/A18-635374
• 1985 23710-02P60/A18-635650
• 1985 23710-02P61/A18-636654
• 1986 23710-19P02/A18-654M30
• 1986 23710-19P03/A18-654M34
• 1987 23710-21P01/A18-680M90
• 88/89 23710-26P00/A18-A04M94
• 88/89 23710-26P01/A18-A04M46

Federal Turbo Automatic NMC/JECS
• 1984 23710-02P12/A18-618371
• 1984 23710-02P13/A18-636375
• 1985 23710-02P70/A18-636651
• 1985 23710-02P71/A18-636655
• 1986 23710-19P12/A18-655M31
• 1986 23710-19P13/A18-655M35
• 1987 23710-21P11/A18-681M91
• 88/89 23710-26P10/A18-A05M95
• 88/89 23710-26P11/A18-A05M47

California Turbo 5spd NMC/JECS
• 1984 23710-02P06/A18-619372
• 1984 23710-02P07/A18-637376
• 1985 23710-02P65/A18-637652
• 1985 23710-02P66/A18-637656
• 1986 23710-19P07/A18-656M32
• 1986 23710-19P08/A18-656M36
• 1987 23710-21P06/A18-682M92
• 88/89 23710-26P05/A18-A06M96
• 88/89 23710-26P05/A18-A06M96

California Turbo Automatic NMC/JECS
• 1984 23710-02P16/A18-620373
• 1984 23710-02P17/A18-638377
• 1985 23710-02P75/A18-638653
• 1985 23710-02P76/A18-638657
• 1986 23710-19P17/A18-657M33
• 1986 23710-19P18/A18-657M37
• 1987 23710-21P16/A18-683M93
• 88/89 23710-26P15/A18-A07M97
• 88/89 23710-26P16/A18-A07M49

Federal Non-Turbo 5spd NMC/JECS
• 1984 23710-01P00/A18-613500
• 1984 23710-01P10/A18-631504
• 1985 23710-01P60/A18-631660
• 1985 23710-01P60/A18-631660
• 1986 23710-18P02/A18-650M20
• 1986 23710-18P03/A18-650M24
• 1987 23710-21P61/A18-676M80
• 88/89 23710-25P00/A18-A00M84
• 88/89 23710-25P01/A18-A00M42

Federal Non-Turbo Automatic NMC/JECS
• 1984 23710-01P10/A18-614501
• 1984 23710-01P11/A18-632505
• 1984 23710-01P11/A18-632505
• 1985 23710-01P71/A18-632665
• 1986 23710-18P12/A18-651M21
• 1986 23710-18P13/A18-651M25
• 1987 23710-21P71/A18-677M81
• 88/89 23710-25P10/A18-A01M85
• 88/89 23710-25P11/A18-A01M43

California Non-Turbo 5spd NMC/JECS
• 1984 23710-01P05/A18-615502
• 1984 23710-01P06/A18-633506
• 1985 23710-01P65/A18-633662
• 1985 23710-01P66/A18-633666
• 1986 23710-18P07/A18-652M22
• 1986 23710-18P08/A18-652M26
• 1987 23710-21P66/A18-678M82
• 88/89 23710-25P05/A18-A02M86
• 88/89 23710-25P06/A18-A02M44

California Non-Turbo Automatic NMC/JECS
• 1984 23710-01P15/A18-616503
• 1984 23710-01P16/A18-634667
• 1985 23710-01P75/A18-634683
• 1985 23710-01P76/A18-634667
• 1986 23710-18P17/A18-653M23
• 1986 23710-18P18/A18-653M27
• 1987 23710-21P76/A18-679M83
• 88/89 23710-25P15/A18-A03M87
• 88/89 23710-25P16/A18-A03M45

Sources Used on This Page:

• 1984-1988 Nissan 300ZX Factory Service Manual
• Z31 parts Fiche
• redz31.net