Circuit Open Relay(COR) Part number 85910-12080 question

[Futo_gt86]

Howdy,

I got a COR for fuel pump, Part number 85910-12080, it has 5 pins, but connector has 2 wires coming out of 12V IGN and 2 wires coming out of Fuel pump 12V






NOTE - Engine / ECU in question is 1UZFE LS400 motor in RN85R 2WD Hilux Conversion, not 4AGE

Didn't even notice until unsheathed the wires
Never seen plug like this, spose to be from AE101?
Do I still run with usual wiring instructions?

White/Black - Wires to STA - Starter/ECU Start Signal. X
EDIT: White/Black is earth
Black - Wires to body earth - Wire to closest earth point.
EDIT: Black is to STA
White/Red - Wires to EFI Relay - +12v Ignition Switched power (Run through a suitably sized fuse, 10A is usually fine, but depends on your fuel pump).

Green - Wires to engine run signal - "FC" pin on ECU. Or if you are running an AFM engine, this wire should connect to the AFM.
EDIT: IF Motor is AFM / MAF and ECU has FC pin, wire Green to FC Pin

Blue/Black - Wire to fuel pump positive - Gives power to your fuel pump.

Cant find a thing on goggle or search.
Also, Why 2 wires from these pins?

[Matt]

Yeah definately from an ae101.

2 wires to the fuel pump, cos one goes to the diag box FP pin. This is used by mechanics to jumper the fuel pump directly for diagnostics / troubleshooting.

Second wire out of the IGN is also power to the ecu for +B ignition power when used in the ae101 configuration.

[Futo_gt86]

Cheers Matt,
So other than that, its the same? as in
Black is Earth
White/Black is STA
Reason I ask is I came across Toymods thread which has thrown me.

[Sprinter86]

Correct me if im wrong, but i was sure the white/black is earth and the straight thick black (or in some cases black/white) was STA signal?

[Matt]

If white is the primary colour with a black stripe it is definitely earth... and the black the starter wire.

Just hook it up directly to the battery to double check, you won't break the relay.

[Futo_gt86]

I been going of this

Between toymods and RC i'm crossed up - I'll have to check it.

[Matt]

That is wrong white/ black is definitely an earth.

Guide I wrote on twincam is here

Following Toyota standard wiring colours earths are always either brown or white/black. Thinking about it though the relay would probably still work as it should if they were reversed

[Golberg]

Matt is correct, but the relay would still work with those 2 wires back to front.

You'd only mess things up if you swapped any of the other wires.

[Futo_gt86]

OK, I switched them around.
Next question,
I have LS400 MAF (Alloy Body type) and am running COR relay for fuel pump.
I need to know which wire on the MAF to splice into for the COR.

E1
E2
THA Air Temp
KS Air flow meter
VC Throttle position sensor Air flow meter


Don't have multimeter to check wire vs flap, but I think i'm looking for switched earth when flap opens, just not sure how to read the above to know what that one is?

EDIT
This is in reference of LS400 1UZ ECU WITH MAF
Note* taken from

How to Wire up a 1UZ engine (VVTI and non-VVTI)

FC Fuel Pump controller - you dont need this wire, this is 'half the speed wire' it sends a signal to the fuel controller ECU to half the pumps speed at idle, this does not trip a relay, the output I measured today was 0.005 or 0.003 volts not enough to trip a normal relay.

FPR Fuel Pump Relay,
... (NOT A Core Wire) –FPR - Across Fuel Pump Relay, - this does not trip a relay, the output I measured today was 0.004 volts not enough to trip a normal relay.

One installer said:
FPC/FPR would control fuel pump computer. They are to be inspected with oscilloscope, you will find 5v pwm signal there. There are ways of setting these outputs to control your pump without stock fuel computer

An uncomfortable error:

One One guy emailed me and said:
I wired the FPR (Pin1 on 16pin connector) trigger into the fuel relay which was fine in the event truck had an accident or stalled fuel relay is shut down. However I had also wired in the FC (Pin 4 on 16 pin connector) trigger in the circuit open relay thinking that the "Fuel Controller" was required, by only having a single speed pump in the hilux when the ecu triggered FC in theory to by pass the resistor and pump at high speed i was in fact cutting out the fuel pump completely. Only an issue when under load.... and when is a 1uz fe not under load?? you would have to be a nanna. Trick for young or not so young wannabe car conversion experts like myself. Hence the reason it would rev slowly up to 6500 rpm but when punched – Death

^ preffer to boycott FC and FPR altogether and go straight from source.

[Golberg]

Why are you triggering the COR off the AFM?

I know that some other manufacturers do this, but I wasn't aware of Toyota doing this.

Does your ECU not have a FP trigger directly?