Red pektron 1861 steering relay
Discussion
Just trying to put the injection electrics back to standard the problem is the pektron 1861 steering relay is sending 7 volts to the air flow meter and to the ECU all the time.
The relay has been rebuilt in the past but it's not right now has anyone got any ideas where I can get hold of one
The relay has been rebuilt in the past but it's not right now has anyone got any ideas where I can get hold of one
This one?...I believe its the same as the XJ/S Jag fuel pump relay...Couldnt find any in UK though...and its used!
https://www.google.co.uk/url?sa=i&rct=j&q=...
Rimmers are out of stock...
https://www.google.co.uk/url?sa=i&rct=j&q=...
Rimmers are out of stock...
A new one available in the States for an eye watering $175. I think the repair option is the way forward.
https://www.jagbits.com/product/DAC1861-OE.html
https://www.jagbits.com/product/DAC1861-OE.html
Repairing mine I could do it but I would need to see an other one as mine has been repaired before and not sure if they put things in the right way round, and that is why they wired the fuel pump to run all the time I will see if I can find more detail about which way the power flows between the metal prongs of the Relay
am I right in thinking that if the air flow meter is not getting 12 volts from this relay it will not give the extra bit of fuel on acceleration because mine never has fired the injectors when you move the flap with the ignition on
am I right in thinking that if the air flow meter is not getting 12 volts from this relay it will not give the extra bit of fuel on acceleration because mine never has fired the injectors when you move the flap with the ignition on
I can't see how the Pektron 1861 could possibly supply 7 Volts to the ECU and air flow meter
I can see how a faulty injection relay could supply 7 Volts to the ECU and air flow meter
The Pektron 1861 does connect to the injection relay and the fuel pump relay, if there was something wrong somewhere and the Pektron 1861 was supplying one or both of the relay coils that or those relays would be energised and supply battery voltage through their contacts
In summary of the above - The injection relay or the fuel pump relay supply nothing when not energised and battery voltage when energised
I would first be checking the injection relay
The Pektron 1861 is easily fixed as it only contains 3 diodes and a resistor, your Pektron 1861 may well be ok
See this - http://www.vintagemodelairplane.com/pages/Rover_Te...
Now see this top right of diagram
I can see how a faulty injection relay could supply 7 Volts to the ECU and air flow meter
The Pektron 1861 does connect to the injection relay and the fuel pump relay, if there was something wrong somewhere and the Pektron 1861 was supplying one or both of the relay coils that or those relays would be energised and supply battery voltage through their contacts
In summary of the above - The injection relay or the fuel pump relay supply nothing when not energised and battery voltage when energised
I would first be checking the injection relay
The Pektron 1861 is easily fixed as it only contains 3 diodes and a resistor, your Pektron 1861 may well be ok
See this - http://www.vintagemodelairplane.com/pages/Rover_Te...
Now see this top right of diagram
If you have visited http://www.vintagemodelairplane.com/pages/Rover_Te... and read all of the page you will now know that the Pektron 1861 is a very simple unit that costs very little to make as it only contains the following
3 x 1N4006 Diodes
1 x 2.7 Ohms Fusible Resistor
3 x 1N4006 Diodes
1 x 2.7 Ohms Fusible Resistor
This resistor in the relay reads 27 ohms is should be 2.7 is it me reading it wrong lf you can tell me what value the color bands add to I tried looking it up more mixed up now electrics not my strong point I am going to run it up to a battery on a bench tomorrow see what results I get
Have you studied the information I posted earlier?
The Pektron energises the relays and if there is battery voltage at the relay contacts the output from the relay contacts should be battery voltage
The Pektron doesn't supply the ECU or Air Flow Meter
You haven't posted what you mean by "all the time"
If there is 7 volts at the ECU and Air Flow Meter "all the time" it is looking like the injection relay is faulty or incorrectly wired, it is the injection relay that supplies the voltage to the ECU and Air Flow Meter
Are you able to explain what you mean by the problem is the pektron 1861 steering relay is sending 7 volts to the air flow meter and to the ECU all the time
The Pektron energises the relays and if there is battery voltage at the relay contacts the output from the relay contacts should be battery voltage
The Pektron doesn't supply the ECU or Air Flow Meter
You haven't posted what you mean by "all the time"
If there is 7 volts at the ECU and Air Flow Meter "all the time" it is looking like the injection relay is faulty or incorrectly wired, it is the injection relay that supplies the voltage to the ECU and Air Flow Meter
Are you able to explain what you mean by the problem is the pektron 1861 steering relay is sending 7 volts to the air flow meter and to the ECU all the time
Can't see that diagram big enough only on mobile at work when I enlarge it it blurs but I have a diagram of a rover SDI on my mobile from vintage aircraft site and it shows a blue and purple wire from the steering relay to the air flow meter to pin 20 at the ecu plug
it was among one of the first check tests they get you to do will look when I get home later tonight I have had so called experts try to sort this no luck they just blamed the injectors which I have had rebuilt but the guy said not that bad pulling hair out at moment not much left to go
it was among one of the first check tests they get you to do will look when I get home later tonight I have had so called experts try to sort this no luck they just blamed the injectors which I have had rebuilt but the guy said not that bad pulling hair out at moment not much left to go
A big monitor will make all the difference
Are you able to explain what you mean by the problem is the pektron 1861 steering relay is sending 7 volts to the air flow meter and to the ECU all the time
Do you mean with ignition on or off, I don't understand what you mean
As I have already mentioned, it is the fuel injection relay that switches the supply to the ECU and Air Flow Meter and it is the contacts in the Air Flow Meter that when closed switch that same supply to the Pektron which in turn operates the fuel pump relay in the same way as the crank wire signal through the Pektron does
The Pektron isn't a relay
Are you able to explain what you mean by the problem is the pektron 1861 steering relay is sending 7 volts to the air flow meter and to the ECU all the time
Do you mean with ignition on or off, I don't understand what you mean
As I have already mentioned, it is the fuel injection relay that switches the supply to the ECU and Air Flow Meter and it is the contacts in the Air Flow Meter that when closed switch that same supply to the Pektron which in turn operates the fuel pump relay in the same way as the crank wire signal through the Pektron does
The Pektron isn't a relay
Sort of getting there the pecktron one way flow system for a better name when tested off car was giving voltage readings between terminals that had no connection it was so dirty and burnt up inside from a repair it was leaking to the other terminals all cleaned up and now reading as should
The real thing trying to sort out is when you move the air meter flap it should fire the injectors it doesn't it sends power to the pecktron it makes the white green live which has been cut to be sorted later but the white and red wire still remains dead
The flap test am I right in thinking I need to be hearing the injectors fire if not am I missing that extra bit of injection on hard acceleration or is that a myth
Off to work now doubt if I will get much time this weekend to work on it
The real thing trying to sort out is when you move the air meter flap it should fire the injectors it doesn't it sends power to the pecktron it makes the white green live which has been cut to be sorted later but the white and red wire still remains dead
The flap test am I right in thinking I need to be hearing the injectors fire if not am I missing that extra bit of injection on hard acceleration or is that a myth
Off to work now doubt if I will get much time this weekend to work on it
I have drawn the below diagram for you as I think it may help you see better the circuits that you are checking through, if I find time tomorrow I can edit my diagram file so as to show each stage of the circuits operation, the thing is I don't want to be spending time on something that you may not need, please let me know if you want the operations posting
Click on the below image and then click on the next shown image for full size viewing
Click on the below image and then click on the next shown image for full size viewing
Edited by Penelope Stopit on Friday 23 March 22:17
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