Nissan 6303, 6802 installation manual Upgrading ECU MAF hardware, 1984-1986 CR31/Z31/VLT

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9. Upgrading ECU MAF hardware

Early model engine control units such as Z31, R31, most HR31 (1985-1988) and VL Turbo use a 2 -7 volt hotwire airflow meter. These air flow meters then have their voltage converted to 0 - 5 volts for the internal microprocessor using what is known as 'opamp' circuitry.

The later model ECUs and airflow meters all work on 0 - 5 volt circuitry.

When installing a later model mass airflow meter from a later model vehicle to one of these earlier model vehicles, it is necessary to modify the ECU hardware to handle the difference in air flow meter voltage.

This is done by either altering or removing the circuitry path via the opamp, and then limiting the maximum voltage using a zener diode. These instructions details the steps to take when modifying the ECU

Further instructions regarding MAF pinouts are available in the Software Users Manual.

1984-1986 CR31/Z31/VLT

1.Locate the op amp surface mount board in your ECU as pictured below

2.Remove pin 14 on RHS of mini board

Do this by applying heat to the top of the connector and then pushing away from the mini board with a flat blade screw driver. Then using tweezers to hold the connectors, heat the opposite side of the circuit board to remove the connector completely.

5.Install the Zener diode to the reverse side of the ECU. Zener diode is available from us or from Altronics (Australia) or Dick Smith (Australia) as well as other electronics components shops worldwide: http://www.altronics.com.au/index.asp?area=item&id=Z0314

Pictured below with banded end of the zener diode facing the installed AFM signal jumper wire. The other end is connected to the ground pin of the mini board. This will limit the voltage from the AFM to 5.1 volts

NIStune Type 1 Hardware Installation

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Contents TYPE#1 Introduction Terms and Conditions Warranty NIStune Type 1 Hardware Installation Table of Contents Removing the ECU Opening the ECU Dual Board Dual ROM ECUs Resocketing the ECUPage Page Vehicles Z31 300ZX VG30 1986-1987, CR31 / VL / VLT RB30 Single Board Dual ROM ECUsPage Vehicles Z31 300ZX VG30 1987, VL RB30 Single Board Single ROM ECUs1989 Z31 VG30E/ET Single Board Single ROM Header Connector ECUsS13 CA18DE/DET A31 RB20DE/DET EK10 MA09ERT / S13 KA24E CPU Header Connector Installation Early Model ECUs 1989 Z31 300ZX Later Model ECUsS13 CA18 / S13 KA24E J30 MaximaHR31 RB20 A31 RB20USB Connector Installation Page Inserting The Board HR31 HR20 Installation NIStune Type 1 Hardware Installation Securing The Board Installing In The Vehicle 1984-1986 CR31/Z31/VLT Upgrading ECU MAF hardware1987 1989 Z31 1986-1988 HR31 RB20DET ECU Type a Reading the factory ROM imageECU Type B ECU Types C, DCAR Modelenginenissan PART#YEARTYPEDESCRIPTION Revision History

6303, 6802 specifications

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In summary, the Nissan 6802 and 6303 are remarkable vehicles that showcase the brand’s dedication to innovation, performance, and safety. With their distinct characteristics and technologies, they cater to a wide range of drivers, enhancing the Nissan experience in different segments of the market.
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