Zongshen RX3 (ZS250GY-3): Delphi Multec EFI
 

The Zongshen RX3 employs Delphi Multec Electronic Fuel Injection, which is documented at the Delphi website.

http://www.delphi.com/manufacturers/...wertrain/small

http://www.delphi.com/docs/default-s...f.pdf?sfvrsn=0

http://i442.photobucket.com/albums/q...ps725214a5.jpg

Single cylinder motorcycles, such as the Zongshen RX3, employ a system using the MT05 engine control module (ECM).

http://www.delphi.com/manufacturers/...owertrain/mt05

http://www.delphi.com/docs/default-s...f.pdf?sfvrsn=0

This ECM receives information from a number of sensors.

Zongshen provides the crank sensor, which is located inside the Zongshen NC250 engine.

The engine temperature sensor measures coolant temperature, and is located in the thrermostat housing under the fuel tank.

The oxygen sensor is attached to a bung on the exhaust header.

http://www.delphi.com/manufacturers/...in/mini_swh_ox

http://www.delphi.com/docs/default-s...f.pdf?sfvrsn=0

The manifold absolute pressure (MAP) sensor, manifold air temperature (MAT) sensor, and fuel injector are attached to the intake manifold.

The throttle position sensor is incorporated in the Delphi throttle body.

http://www.delphi.com/manufacturers/...rain/etc_tb_sm

http://www.delphi.com/docs/default-s...f.pdf?sfvrsn=0

A fuel pump, which provides pressurized fuel to the fuel injector, is located inside the fuel tank.

http://www.delphi.com/manufacturers/...rain/sm_eng_fm

http://www.delphi.com/docs/default-s...f.pdf?sfvrsn=0

The Delphi Small Engine EMS Service Manual is located at the following link.

http://www.huntermotorcycles.com.au/...l%20Manual.pdf

Many Harley Davidson motorcycle employ the Delphi Multec EFI system. The following link describes how Delphi EFI systems work in the multi-cylinder HD engines.

http://www.nightrider.com/biketech/m...asics.htm#null

Many Yamaha motorcycles also employ electonic fuel injection. Although the Yamaha EFI systems are different from the Zongshen EFI system, one can learn many troubleshooting techniques by watching the following Yamaha videos. ;)

https://www.youtube.com/watch?v=fujeAFAjb4A

Here are a several videos showing how to clean a fuel injector.

https://www.youtube.com/watch?v=rLuAVhVp44Y

I'm geeking out over this stuff.

I was surprised (and impressed) to learn that Delphi offers a stepping motor throttle body, rather than a throttle cable. That would create drive by wire that is so common in cars now.

I don't want that level of complexity on my bike, but it's cool nonetheless.

The stepper motor in this case is likely for idle speed . I think it would still use a throttle cable for throttle input. Idle steppers allow air to bypass the throttle blade and maintain idle throttle position sensor voltage

Thank you for your input, Racer. :) I'm pretty sure you are correct regarding the stepper motor being employed only for idle speed of the RX3.

The Multec MT05 webpage indicates this ECM employs idle air control (IAC), which undoubtedly utilizes the stepper motor.

http://www.delphi.com/manufacturers/...owertrain/mt05

http://www.delphi.com/docs/default-s...f.pdf?sfvrsn=0

The Delphi webpage for the Multec MT05 contains this information.

Serial Communication feature flexibility: Controller Area Network (CAN) or KW2000

http://www.delphi.com/manufacturers/...owertrain/mt05

I just found a web source which indicates you can use an OBD2 reader for all late model cars to communicate with the Delphi MT05 ECM. :tup: I will do some more research, and post my findings later. :)

In the meanwhile, here are several links to OBD2 and CAN scanners. You can get one from China for $16.25, delivered. :)

http://i.ebayimg.com/00/s/MTUwMFgxNT..._id=880000500F

http://www.nationaltoolwarehouse.com...IuJxoCATfw_wcB

http://www.ebay.com/itm/Autel-MS300-...p2054897.l4275

http://www.harborfreight.com/can-obd...0693-html.html

Apparently, you can also borrow an SERT scanner, and export the data to free graphing software. ;)

Perhaps we can use this $9 cable to connect a computer directly to the Multec MT05 ECM. ;)

http://www.ebay.com/itm/VAG-COM-KKL-...p2054897.l4275

http://image4.pushauction.com/350/35...beeaa19e04.jpg

Of course, you're right. I got a little too excited. :D

That would be really cool. I just received a bluetooth scan tool from my nephew (he's awesome), and it communicates with a smart phone. I'm really looking forward to trying it in my truck, to observe real-time data. I'll let you know how it works.

Here are the malfunction codes for the Delphi MT05 ECM, as retrieved from the service manual.

http://i442.photobucket.com/albums/q...ps2687f95a.jpg

These codes match the OBDII codes shown at the following website. :)

http://www.troublecodes.net/OBD2/Pcodes/

Here is the Delphi MT05 wiring diagram for a 2-cylinder engine, taken from the service manual.

http://i442.photobucket.com/albums/q...psfe06609b.jpg

Here is the connector pin information for the Delphi MT05 ECM.

http://i442.photobucket.com/albums/q...ps05a09e47.jpg

Neither connector appears to fit the OBD2 scanner connector, which is shown below. :hmm:

http://www.obdii.com/images/connectorblue.GIF

The OBD2 pin connections are described in the following link.

http://www.obdii.com/connector.html

The Delphi MT05 uses a 6-pin connector for diagnostics, as shown in the photograph below.

http://1.bp.blogspot.com/-fzei72e064...024_200632.jpg

Therefore, it seems we will need to make an adapter to connect the appropriate pins of the OBD2 connector to the 6-pin Delphi connector. Likewise, we could also make an adapter to connect the OBD2 connector to one of the 18-pin connectors on the MT05 ECM itself.

The Delphi fuel injectors have a heated tip to aid starting a cold engine with ethanol fuel. :)

https://www.youtube.com/watch?v=IdJL36J6d5k

The Delphi MAP/MAT sensor employed by the Zongshen RX3 is specified in the Delphi service manual.

http://i442.photobucket.com/albums/q...psb2a1582f.jpg

This item has several part numbers.

Delphi 12232201
Delphi AMW250118
Delphi 93333350
Delphi SMW250118

Excellent! I'm pleased to hear that Delphi chose industry-standard existing codes. :tup:

J1 and J2 are the connectors at the ECM, and are not designed for scanner interface, much like in your car. What we need to find is either the male version of the Delphi 6-pin, or just buy a male OBD2 connector and ditch the Delphi connector.

What we need to know is the pinout of the Delphi 6-pin.

I agree that a heated injector would help with cold-starting (as you say), but I do not agree that ethanol will not ignite in liquid form (as the video implies).

Non-heated auto injector systems and even E85-specific carbs will still run without added heat.

The real benefit is easy, consistent starting in any temperature, and no need for an enrichment circuit or conventional choke.

As always, thank you for you informed input, Weld. :)

I believe the Delphi, 6-pin female is Delphi part #12052848. Here are just a few links to vendors for that part.

http://www.mouser.com/ProductDetail/...Q5ZRoCdwDw_wcB

http://www.electricalhub.com/delphi-...pack-connector

http://www.waytekwire.com/item/38210...-SERIES-6-PIN/

I believe the Delphi, 6-pin male connector is Delphi part #12124107. Here are a few links for that part.

http://www.waytekwire.com/item/38209...-SERIES-6-PIN/

http://www.mouser.com/ProductDetail/...jRDxoCi9fw_wcB

http://elcodis.com/parts/2024047/12124107.html

http://delphi.com/connectors/product...esults&start=0

Perhaps the easiest solution is to buy an adapter harness, such as the one in the link below, and wire the appropriate Delphi plug on the other end.

http://www.ebay.com/itm/20-to-16-Pin..._Tools&vxp=mtr

Here is some more information on OBD2 connector wiring.

http://www.bmwgm5.com/Peake_AB03.htm
http://www.obdtester.com/obd2_connector
http://www.change2e85.com/servlet/Detail?no=160
https://plxdevices.com/obd/
http://www.obdtester.com/obd2_protocols
http://clubroadster.net/vb_forum/74-...t-install.html
http://www.rberger.com/Car_Diagnosti...stic_Codes.php

Someone was selling a Delphi Motor Scan KF90121 on ebay for $109.99, delivered. See the information at the bottom of the webpage. ;)

http://www.ebay.com/itm/Delphi-Motor...78bdf1&vxp=mtr

Here are some photographs of the Delphi motor scan, and it's connectors.

http://i.ebayimg.com/00/s/NTg1WDk2Mw...T79mi/$_57.JPG

http://i.ebayimg.com/00/s/OTM2WDUyNg...T79np/$_57.JPG

Here are some other photographs of the scanner.

http://i.ebayimg.com/00/s/NTg1WDk1NQ...T79m3/$_57.JPG

http://i.ebayimg.com/00/s/NTg1WDEwND...T79nI/$_57.JPG

http://i.ebayimg.com/00/s/NTI2WDkzNg...T79nS/$_57.JPG

Here's the wiring diagram for the scanner connector from page 70 of the Delphi service manual.

http://i442.photobucket.com/albums/q...ps1ccb9893.jpg

Perhaps somebody already manufactures a Dephi 6-pin to OBDII adapter.

That's well worth jumping on.

As always, thanks for your feedback, Weld. :)

The Delphi, MT05 diagnostic plug only employs three wires, as shown in the Delphi service manual.

http://i442.photobucket.com/albums/q...ps1ccb9893.jpg

The OBD2 code specifies the following wiring, as shown at the link below.

Pins 4&5: Ground
Pins 7&8: K-Line
Pin 16: +12V Battery

http://www.bmwgm5.com/Peake_AB03.htm

I might as well convert the RX3, 6-pin Delphi connectors to 3-pin Delphi connectors, which I can get from eBay. ;)

http://www.ebay.com/itm/New-Delphi-W...p2054897.l4275

I am inclined to purchase the following adapter, and wire the correct OBD2 pins to the corresponding Delphi pins, using one of the 3-pin Delphi connectors.

http://www.ebay.com/itm/Diagnostic-C..._Tools&vxp=mtr

http://images.nsioutlet.com/product/...-00100_c1b.jpg

http://images.nsioutlet.com/product/...-00100_c3b.jpg

I can then connect this OBD2 adapter harness to any OBD2 scanner, such as the inexpensive, OBD2 scanner shown in the link below. :)

http://www.ebay.com/itm/Autel-MS300-...p2054897.l4275

http://i.ebayimg.com/00/s/MTUwMFgxNT..._id=880000500F

That is certainly an economical way to go. After you've adapted the harness and purchased the connector, perhaps you could borrow a higher quality scanner from Andy to see what other features might be useful.

You might also choose to buy an OBDII connector that will plug into a laptop, which could allow for custom fuel mapping, etc.

Thank you, Weld. :) If enough space is available, I will probably keep the OBD2 adapter harness stored under the pillion saddle.

Dobeck
 

Looks very promising. Copy of their reply.

Thank you for your interest in a Dobeck Performance fuel solution.

It is very possible for us to develop a fuel solution.
We would either need one of these bikes available to test with or some specific tech information to see if we have a solution available.

I have informed R&D about your interest. I will contact you with an update as soon as I hear back from them.

Will you have one of these bikes?
Where are you located?

Let me know if you have any other questions.


Regards,

Dillon Binstock | Dobeck Performance
Sales | Marketing

Thanks for posting the update, Mark. :) How long do they need the bike for testing?

So cool! I'd happily give up my bike for awhile to allow for tuning development.

I'll follow up with them and find out how long they need it.

The folks at Dolbek are very responsive and seem interested in our Chinese thumper.
Here is there latest reply.

"Mark,

In a perfect world, we could finalize an application in about a week.

However, we usually have multiple projects going on at once.
Two weeks is probably a more accurate statement and that is if we don’t have any technical hurdles.

Will you have this bike available once it is released into the USA?
Where are you located at?

Talk to you soon."

Two weeks is a long time. ;) Does the lender get a free EJK Fuel Controller?

:lol: