Jump to content


Photo

SPI Relay Pack Functionality


Best Answer seria , 26 April 2007 - 04:25 AM

Would it possible to post some pictures together with the explanation? I can take picture and send it to you if needed. So far i don't quiet follow as it involve so many relays.
Thanks. Go to the full post


  • Please log in to reply
7 replies to this topic

#1 Sprocket

Sprocket

    Great on Injection faults

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 7,001 posts
  • Location: Warrington
  • Local Club: Manchester Minis

Posted 25 April 2007 - 08:02 PM

Description of the relay pack control.

This is the likely scenario you will experience on the SPi engines, this however may differ slightly between years as Rover changed the wiring as far as i can see about 4 times. Slight changes may be experienced, but for the most its the same.

Coil side of relay pack (small connector)

+ve supply to the relay coils

The main relay is permenantly supplied with 12v (internal), the fuel pump relay is supplied with 12v from the IGN position on the key switch (white), the manifold heater relay coil is supplied with 12v when the main relay is energised (internal but common to brown pink), the starter relay coil has two options depending on year. One, the starter coil is supllied with 12v when the key switch is turnd to CNK (white with red). Two, the starter coil is supplied with 12v when the key switch is turned to CNK (white with pink). Note the latter, the wire from the starter switch is white with red, then changes to white with pink through the body to engine loom connector.

-ve supply to the relay coils.

The main relay is grounded by the ECU (white with pink), the fuel pump relay is grounded by the ECU (black with purple), the manifold heater relay is gounded by the ECU (black with pink), the starter relay has two options depending on year. One, the starter relay is grounded (black pin4). Two the starter relay is grounded by the alarm ECU ( white with red). Note the latter, the wire from pin4 of the relay pack changes from white with red to white with pink, through the body to engine loom connector.

Main switched power supply (large connector)

All four relays are fed with 12v from the battery (brown). Main relay switched live is brown with pink. Fuel pump switched live is brown with slate(grey). Manifold heater switched live is brown with blue. Starter switched live is brown with red.


Logic explained

When the key switch is turned to IGN 12v is supplied to the ECU on a white wire this powers the ECU. The ECU will then initiate the fuel pump for 10 seconds and then de activates it again if there is no further activity. Turn the key to CRK the starter is initiated (if the imobiliser/alarm is off, where fitted). Activity is recorded by the ECU on the Crank Position Sensor. The ECU then initiates the Main relay. This provides power to the ignition coil, stepper motor, purge valve solenoid, and ECU directly on the brown pink, and the injector via the ECU. The engine should now start. Once the RPM is above a predetermined RPM the manifold heater is initiated until the coolant temp measures 75c or more it is then de activated. The Main relay, and fuel pump relay, are the only ones to be energised when the engine is running and fully warmed up.

#2 seria

seria

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 76 posts

Posted 26 April 2007 - 04:25 AM   Best Answer

Would it possible to post some pictures together with the explanation? I can take picture and send it to you if needed. So far i don't quiet follow as it involve so many relays.
Thanks.

#3 rocketbeta

rocketbeta

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 56 posts

Posted 20 April 2010 - 09:17 PM

Description of the relay pack control.

This is the likely scenario you will experience on the SPi engines, this however may differ slightly between years as Rover changed the wiring as far as i can see about 4 times. Slight changes may be experienced, but for the most its the same.

Coil side of relay pack (small connector)

+ve supply to the relay coils

The main relay is permenantly supplied with 12v (internal), the fuel pump relay is supplied with 12v from the IGN position on the key switch (white), the manifold heater relay coil is supplied with 12v when the main relay is energised (internal but common to brown pink), the starter relay coil has two options depending on year. One, the starter coil is supllied with 12v when the key switch is turnd to CNK (white with red). Two, the starter coil is supplied with 12v when the key switch is turned to CNK (white with pink). Note the latter, the wire from the starter switch is white with red, then changes to white with pink through the body to engine loom connector.

-ve supply to the relay coils.

The main relay is grounded by the ECU (white with pink), the fuel pump relay is grounded by the ECU (black with purple), the manifold heater relay is gounded by the ECU (black with pink), the starter relay has two options depending on year. One, the starter relay is grounded (black pin4). Two the starter relay is grounded by the alarm ECU ( white with red). Note the latter, the wire from pin4 of the relay pack changes from white with red to white with pink, through the body to engine loom connector.

Main switched power supply (large connector)

All four relays are fed with 12v from the battery (brown). Main relay switched live is brown with pink. Fuel pump switched live is brown with slate(grey). Manifold heater switched live is brown with blue. Starter switched live is brown with red.


Logic explained

When the key switch is turned to IGN 12v is supplied to the ECU on a white wire this powers the ECU. The ECU will then initiate the fuel pump for 10 seconds and then de activates it again if there is no further activity. Turn the key to CRK the starter is initiated (if the imobiliser/alarm is off, where fitted). Activity is recorded by the ECU on the Crank Position Sensor. The ECU then initiates the Main relay. This provides power to the ignition coil, stepper motor, purge valve solenoid, and ECU directly on the brown pink, and the injector via the ECU. The engine should now start. Once the RPM is above a predetermined RPM the manifold heater is initiated until the coolant temp measures 75c or more it is then de activated. The Main relay, and fuel pump relay, are the only ones to be energised when the engine is running and fully warmed up.


I have a question, how would I test to see if one of the relays is not working? I pulled out the relay manifold and it smelled burnt. I'm asking the question because my 1996 Mini 1200cc (Fuel Injected, SPI) isn't starting and I wanted to confirm that the starter relay isn't out.

Thanks,

Anthony

#4 FlyingScot

FlyingScot

    Up Into Fourth

  • Mini Docs
  • PipPipPipPipPipPipPipPipPip
  • 2,222 posts
  • Location: Inverclyde Scotland
  • Local Club: Mini Clan (MiniComic)

Posted 17 January 2014 - 07:05 PM

To help with the issues around the Relay Pack where it is maybe difficult to visualise.
 
This is for model YWB10022 the so called Yellow sticker version for SPi.
 
Whats inside the black box?
 
Attached File  YWB10022 Inside view.jpg   52.5K   430 downloads
 
Wiring connections
 
Attached File  YWB10022 Wiring Pin out.jpg   48.13K   457 downloads
Note the bottom right hand control connection (small plug) is a thick cable white/pink or white/red cable depending on whether you have an immobiliser or not.
 
Hopefully when read with Sprockets earlier words this will help.
 
You can test across the relay coils with a multimeter set to Ohms once the unit is out of the cars wiring. If you ignore the shunt resistors the coils themselves should be about 66ohms. Obviously of there is no reading across the tops of the pins you know the coil is burnt out.
Likewise you can test the contacts by operating manually and measuring the resistance.
 
FlyingScot

Edited by FlyingScot, 24 January 2014 - 12:12 PM.


#5 Uxmini

Uxmini

    Starting My Mini Up

  • Noobies
  • Pip
  • 3 posts
  • Location: Uxbridge, Ontario

Posted 07 October 2016 - 12:57 PM

Is it possible to repair the SPI Relay box? Mine is ticking and the starter no longer turns and the fuel pump is not running.If repair is not considered feasible where can a replacement be found?


Edited by Uxmini, 07 October 2016 - 12:59 PM.


#6 Uxmini

Uxmini

    Starting My Mini Up

  • Noobies
  • Pip
  • 3 posts
  • Location: Uxbridge, Ontario

Posted 07 October 2016 - 02:22 PM

...and...where can I get a wiring diagram for a 1991 Cooper with air conditioning?



#7 FlyingScot

FlyingScot

    Up Into Fourth

  • Mini Docs
  • PipPipPipPipPipPipPipPipPip
  • 2,222 posts
  • Location: Inverclyde Scotland
  • Local Club: Mini Clan (MiniComic)

Posted 07 October 2016 - 06:15 PM

Is it possible to repair the SPI Relay box? Mine is ticking and the starter no longer turns and the fuel pump is not running.If repair is not considered feasible where can a replacement be found?

Usual issue is earthing. It is possible repair by replacing the open frame relays if you can find a local supplier.
You can buy new from minispares

FS

#8 Uxmini

Uxmini

    Starting My Mini Up

  • Noobies
  • Pip
  • 3 posts
  • Location: Uxbridge, Ontario

Posted 07 October 2016 - 06:36 PM

Thank you, FlyingScot.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

Mini Spares