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Z31 Fuel Injector, 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.

Z31 Engine Control Computer System (ECCS) Interchange Information

Year(s)	Type	Fuel Injector Impedance	Fuel Injector Feed Style	Oxygen Sensor Type	Oxygen 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

Note: This chart applies to U.S.-market Z31 models only. Verify part numbers before purchase.

ECCS Location

The ECCS or Computer for the Z31 is located behind the passenger's kick panel. This is the small panel on the outer wall right below the glovebox. You will need to remove 2 screws to get the panel off.

There are three connectors that plug into the ECCM. These connections can sometimes corrode and cause Driveability issues. Cleaning these will resolve some problems but sometimes for Diagnostic procedures you will need to check the pinout on sensors.

ECU Lookup

To lookup your ECU or interchange for ECU, O2 sensors, or Fuel Injectors, complete one of the search boxes and click submit. 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 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.

ECU/Fuel Injector/O2 Sensor Interchange Information

There is absolutely no difference between a regular 1988 Turbo ECU and an “88SS” ECU. The “88 Shiro” branding is purely marketing and does not affect performance.

!Top Feed Fuel Injectors

!Side Feed Fuel Injectors

NA injectors:~180cc/minTurbo injectors:~260cc/min- ECUs are programmed accordingly.

High impedance ECU with low impedance injectors: You must install six 6–10Ω 10W dropping resistors to avoid damaging the injector drivers. If you add dropping resistors, the fuel injectors must be rewired to factory spec (pre-service campaign).

Low impedance ECU driving high impedance injectors: This setup should operate normally.

Feed type does not matter to the ECU. What matters are impedance and flow rating. However, the lower intake manifolds differ; you may need to shave or shim the injector mounting area if swapping between types.

Oxygen Sensors

TitaniaandZirconiumsensors are not interchangeable.- Zirconium sensors output a 0–1V signal. - Titania sensors vary resistance for ECU feedback.

To use an 86–89T ECU with a different sensor type, you must rewire the harness and change the O2 sensor bung (Titania = 17mm, Zirconium = 22mm).

ECU Interchange Notes

California and Federal ECUs:Fully interchangeable. CAL units include an EGT sensor.88–89 ECUs:PROM chips are swappable between NA and Turbo models. This allows you to use a Zirconium sensor with an NA ECU by installing the Turbo PROM.Turbo ECUs:Feature a detonation sensor daughter-board (NA ECUs do not).Idle control:Turbo and NA use different systems, but cars can run fine with idle devices removed.

Additional Technical Notes

• 88–89 Turbo ECUs use a timing map optimized for the smaller T25 turbo at 4–5 PSI boost.
• 84–85 ECUs (all) may have a slight lean surge during cold start (first 30 seconds). Switching from CHTS to FTS during startup can fix this.

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

Europe had different emission standards for different countries at the time, hence the difference in part numbers for countries

Sources Used

1984-1988 Nissan 300ZX Factory Service Manual

• Z31 parts Fiche
• redz31.net (Jason Butts)
• Euro and JDM ECU part numbers researched by: NissanEgg of Z31performance.com