Tony240ZT Posted July 30, 2002 Share Posted July 30, 2002 I need all the information that I can get on the Z31's mass air flow meters. I'd like to know how much voltage is supplied to each pins, and which ones are used to read voltage levels (by the ecu). Also is one of the pins dedicated to cleaning the MAF? I've done searches on Bosch MAF meters on the web with little results on details. It would help if I had the engine wiring harness for a Z31. The harness is not in the Haynes manual, is there a conspiracy against knowlege? Quote Link to comment Share on other sites More sharing options...
DAW Posted July 30, 2002 Share Posted July 30, 2002 Don't exclude other sources for MAF (BMW, Volvo, Saab, Mitsubishi, etc.), many of these use Bosch circuitry like the Nissan systems and may be adaptable. DAW Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted August 2, 2002 Share Posted August 2, 2002 OK - Here goes - from the Nissan service manual. AFM pin - purpose - connects to Pin A - Variable resistor - eccs pin 30 Pin B - Output Voltage - eccs pin 31 Pin C - Ground - ground Pin D - Ground - ground Pin E - Battery source - EFI relay Pin F - Self clean - eccs pin 12 That's it - FYI - the self clean needs a vehicle speed sensor to work if you use the stock ECCS. This is page EF & EC - 14 from an 86 300zx manual There is a very good section on the EFI system in the factory manual. Are you using a factory 300 ecu on an l28? This is a project I'm doing for a friend right now. I need some help on which systems I can get rid of for the L28 - cheers - Doug Quote Link to comment Share on other sites More sharing options...
Tony240ZT Posted August 4, 2002 Author Share Posted August 4, 2002 Thanks a bunch!! That's EXACTLY what I was looking for. I'll let you know how it goes. I'm actually adapting the z31 mass air to a 280ZX Turbo system using a PIC microprocessor, a few analog to digital chips and a few digital to analog chips. Hopefully will be able to get a package deal out for the L28ET guys who want to rid of their door type AFM. I will be controling the cleaning cycle myself, am not sure exactly how long the wire should be heated, but will not be using a speed sensor, will simply do the cleaning if rpm is taken above a certain amount. Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted August 4, 2002 Share Posted August 4, 2002 Glad I could help - the nissan manual covers the self-clean process. It turns on for 1 sec to clean the wire (1000 deg C), five seconds after shut-down. It doesn't clean if engine speed didn't exceed 1500 rpm on the run, or if the VSS doesn't exceed 12 mph. Water temp has to be less than 239 deg F and the key has to be OFF. Hope this helps out - Doug Quote Link to comment Share on other sites More sharing options...
fl327 Posted August 5, 2002 Share Posted August 5, 2002 i have remapped ecus. Quote Link to comment Share on other sites More sharing options...
fl327 Posted August 6, 2002 Share Posted August 6, 2002 i havent remapped it really, i learned from a good source how to rework the motherboard to run with a z31 maf on an l28et, its a delicate process, but the results are instantly noticeable. Quote Link to comment Share on other sites More sharing options...
Tony240ZT Posted August 6, 2002 Author Share Posted August 6, 2002 InitialZ do you program them yourself? If so I'd love to learn more about the hardware and code. If you can share any info I'd be very greatful. Lots of info out there on GM hardware, but close to none on the Nissan stuff. Quote Link to comment Share on other sites More sharing options...
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