40 replies to this topic

[genpop]

Inertia switch

and then you need a schematic

[cmonson]

Hello,

On the relay pack - small connector - I am trying to figure out the use for the pink/black  (pin 5 I think)

reading through this thread it sounds like it is just a ground wire for the intake heater relay. 

Other than that does it have a purpose?

 

 

If it make a difference I have an older 2 plug SPI ECU

This pink/black wire goes from the small connector on the relay pack to pin 6 on the large connector on the ECU

[genpop]

You are right, but in connection with ecu`s, the black or "ground wires" are the steering or control lines.Power or plus is always there, ground is switched by the ecu!

[Bucko]

If the ECU is not grounding the fuel pump relay coil, first check the crankshaft sensor.
 

Does the fuel pump run for a second or two when the ignition is turned to position II (IGN)? If yes then the ECU is OK, and it's likely a crankshaft sensor problem.

 

One other thing to check, does the main relay also pull in when ignition is turned to Position II (IGN)?

 

Stepper motor will motor the throttle full closed and back open again when ignition key off. If it doesn't there is a more fundamental problem than just the fuel pump relay.

Hi there I am having a similar problem to the one being discussed, my question is what is the more fundamental problem as my main relay does not pull in when ignition is turned on, it will pull in however if i connect an earth

look forward to any response 

[genpop]

main relay has 4 subrelais, which one isn´t working?

[Bucko]

Yes, sorry for any confusion, but I was referencing the piece  that sprocket wrote on the spi relay pack and how it works. 

[Bucko]

Just a quick update if anyone can help, I checked the main brown wire on the relay pack and it gives me 12v with the red lead connected to it and the black lead connected to a common ground, but if I connect the the black lead to the black/purple wire coming from the ecu and crank the engine it only gives 1-2 volts, which will not allow the main relay to energise. Any suggestions or is the ecu at fault or just a dodgy earth

[genpop]

Referring to post 1 in this thread

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.

 

first check if the other things work.Then check if the mainrelay gets ground from the ecu. Speak cranc position sensor.

[Bucko]

The main relay is not getting its ground from the ecu, so if I push the contact in manually ( on the main relay) everything works as it should and the engine runs fine, but it won’t stay energised, with me holding in the contact manually it allowed me to connect my Sykes pickivant code reader and it was showing no errors.

[genpop]

Have the ecu checked.

[sonscar]

Before condemning the ECU prove the continuity of the wiring from the ECU connector onwards to the relay.Probably ok but cheap to check,Steve..