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AltezzaLink (JZX110) not turning fuel pump on


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Hi guys, hoping for some help.

I selected the AltezzaLink ecu for my JZX110 with 1JZ vvti due to this ecu supporting the e-throttle and toyota multiplex system.  I have made a patch harness which converts the JZX110 pinout to the altezza pinout. Injectors, ignition and throttle are working (tested), but fuel pump relay output (on expansion connector AUX8) is not turning fuel pump on. The fuel pump status always remains off. When choosing the TEST ON or TEST PWM options, the status does show as on but still no fuel pump. I've double checked my wiring.  Can anyone suggest a solution or reason for this issue?

Thanks,

Mitch

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Hi Adam, wish I had thought of grounding the wire out. The car is my daily so its back together running on stock ecu, will test your suggestion as soon I have a chance.

Regarding the BEAN, could you elaborate? As far as the AltezzaLink documentation says, the BEAN is for A/C, some temperatures, battery voltage, etc. Fuel pump is not mentioned. Both the Altezza and JZX110 each have a single ecu pin which is for fuel pump relay, so I was expecting it to work similarly in both cars.

Admittedly this is my first time delving into programmable ecus, so hopefully I'm not way off.

Thanks for your help

EDIT: I've done a bit more research. Is it possible the expansion connector AUX8 is not able to operate a fuel pump? As seen here: 

 

Edited by MitchW
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2 hours ago, MitchW said:

Regarding the BEAN, could you elaborate? As far as the AltezzaLink documentation says, the BEAN is for A/C, some temperatures, battery voltage, etc. Fuel pump is not mentioned. Both the Altezza and JZX110 each have a single ecu pin which is for fuel pump relay, so I was expecting it to work similarly in both cars

Its a bit of an unknown.  Our factory wiring diagram shows a fairly conventional relay connected to pin N3/E3 (ign 5).  However looking at our drawings/notes for the Altezza it seems our Altezza test car didnt have anything connected to this pin but I assume the fuel pump still worked.

 

2 hours ago, MitchW said:

EDIT: I've done a bit more research. Is it possible the expansion connector AUX8 is not able to operate a fuel pump? As seen here: 

No, irrelevant, Aux 8 is fine.

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2 hours ago, Adamw said:

Its a bit of an unknown.  Our factory wiring diagram shows a fairly conventional relay connected to pin N3/E3 (ign 5).  However looking at our drawings/notes for the Altezza it seems our Altezza test car didnt have anything connected to this pin but I assume the fuel pump still worked.

My wiring harness does have a wire connecting to that pin on the stock ecu, and also has a conventional fuel pump relay. It should be very easy to turn this pump on. I will try your suggestions and let you know how I go. Thanks for your help

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  • 2 weeks later...

Hi Adam,

Nothing I have tried will get the Link ECU turn the Fuel Pump relay on. Grounding the harness pin out does not help, however supplying the pin with 12V straight from the battery instantly turns the relay on. Knowing this, I started checking the output voltages from the ECU. With AUX8 (Expansion harness) set to TEST ON, the output voltage is 10.5 (with battery at 11.8) when not connected to the harness. Once connected to the fuel pump relay pin, the voltage drops to 0.5V and relay does not turn on.

Alternatively, using the original fuel pump relay pin location of ignition drive 5 set to TEST ON, the output is 5v without connection to the harness which would not be enough for a 12V relay in any case.

Any suggestions? Thanks

EDIT: latest firmware, and resistance across the relay is 80 Ohms. Fuel system works perfectly with factory ecu back in (checked, and it supplies 12V to the Fuel Pump Relay pin).

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Aux outs are ground switched and when off are pulled up to 12 Volts , but with a high resistance , not enough to turn on a relay.  I would say the fuel pump relay has been wired wrong previously , if possible, rewire the terminals so that 86 goes to ignition switched live, and 85 goes to the aux out. ( 30 is the supply voltage and 87 the output )

EDIT: just noticed you said it worked fine with the factory ecu 

HTH,

 Richard.

I would suggest first disconnecting the ecu and ground the fuel pump relay trigger pin at the ecu header.  Does the fuel pump come on ?

Edited by Richard Hill
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Hi Richard, thanks for the reply.

All wiring looks untouched from factory, and works fine with factory ECU so I don't believe anything has been changed in the fuel pump wiring. I would prefer to leave it operating in stock form if possible so I can easily revert to back if needed. I checked the output from factory ECU when cranking/idling, and there is 12v at the Fuel Pump Relay pin.

I have tried your suggestion of grounding the pin (also suggested by Adam previously), and relay does not click nor fuel pump prime when grounded. When I jump 12V to the same pin, relay does click on. This seems wrong to me, and apparently seems wrong to you too.

Thanks,

Mitch

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Just so i'm clear on this - you're talking about the ign5 pin? (or that same pin location on the factory ECU) - and this test shows that from factory it drives pin ign5 high (ie supplies 12v) to enable the fuel pump relay?

In that case,you either need to pull out that wire and connect it to one of aux5-8 so you can also high side drive it from the link, or you need to modify the wiring so you are driving a relay to ground from ign5 (swap some wiring at the relay so the "other" side of the control circuit is 12v switched). Either way its going to end up as a slight modification to swap the factory ECU in & out. The link cant supply any meaningful positive current out of IGN5.

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4 hours ago, cj said:

Just so i'm clear on this - you're talking about the ign5 pin? (or that same pin location on the factory ECU) - and this test shows that from factory it drives pin ign5 high (ie supplies 12v) to enable the fuel pump relay?

In that case,you either need to pull out that wire and connect it to one of aux5-8 so you can also high side drive it from the link, or you need to modify the wiring so you are driving a relay to ground from ign5 (swap some wiring at the relay so the "other" side of the control circuit is 12v switched). Either way its going to end up as a slight modification to swap the factory ECU in & out. The link cant supply any meaningful positive current out of IGN5.

Hi CJ,

The original fuel pump pin as per the AltezzaLink documentation is IGN5, however I have tried the fuel pump relay on both IGN5 and AUX8 (expansion harness) with all the same results. I have tried all combinations of high side/low side, and high polarity/low polarity. Only AUX8 has the high side driver option as you have said, but still nothing works.

I suspect I'm missing something obvious but can't figured it out yet.

Thanks,

Mitch

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As Richard Hill mentioned earlier the aux outputs are a ground switch.  You will need to wire your relay so it can be switched with a ground signal.  There are no high side drive outputs on the Altezza ECU.

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  • 4 months later...
1 hour ago, wireman said:

hi guys am currently wiring link into an is200 trying to figure out what to wire the multiplex comms to on the link fury ecu and how to configure this I the link ecu

It is not possible.  The Altezza ECU that this thread was about has a seperate microcontroller and transceivers fitted inside to handle the complex BEAN (multiplex) comms.  The ECU sends and receives all the required information to/from the BEAN micro over CAN bus, the micro handles all comms with the chassis. 

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Wireman, AdamW is spot on. The Altezza PnP ecu is the only aftermarket ecu that I know of which supports the Toyota multiplex network.

 

As an update to my original question for anyone interested, it was a wiring problem. I found a JZX110 wiring diagram, and discovered the fuel pump circuit features two relays; the first to turn the fuel pump on but through a resistor (fuel pump runs at low speed), and a second relay to bypass the resistor and allow the pump to run at full speed. My mistake was that I was only energising the second relay to bypass the resistor, not the first relay to energise the whole fuel pump circuit. The relevant pins are E4 (energise the circuit) and E3 (bypass the resistor).

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  • 4 months later...
On 11/28/2019 at 9:35 PM, MitchW said:

Wireman, AdamW is spot on. The Altezza PnP ecu is the only aftermarket ecu that I know of which supports the Toyota multiplex network.

 

As an update to my original question for anyone interested, it was a wiring problem. I found a JZX110 wiring diagram, and discovered the fuel pump circuit features two relays; the first to turn the fuel pump on but through a resistor (fuel pump runs at low speed), and a second relay to bypass the resistor and allow the pump to run at full speed. My mistake was that I was only energising the second relay to bypass the resistor, not the first relay to energise the whole fuel pump circuit. The relevant pins are E4 (energise the circuit) and E3 (bypass the resistor).

Hey man

I have also done the altezza link into jzx110 recently and when I repinned the ecu I only connected the fc (circut opening) pin not the fpr and it worked haha, am I right in saying the fc bypasses the resistor thats on the strut tower between the fuse boxes? and that I'm probably supplying 12v full time to the pump?

did yours not function at all with only the fc pin connected?

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  • 4 weeks later...

Sorry for a late reply zsmitho, I didn't see any email notification for your comment. 

On 4/25/2020 at 11:50 AM, zsmitho said:

I have also done the altezza link into jzx110 recently and when I repinned the ecu I only connected the fc (circut opening) pin not the fpr and it worked haha, am I right in saying the fc bypasses the resistor thats on the strut tower between the fuse boxes? and that I'm probably supplying 12v full time to the pump?

You've done better than me first time around!

Based on the wiring diagram I found, it indicates that the way you have it wired up would be constantly running through the resistor. The relay for the secondary circuit which bypasses the resistor is not being activated. See photo attached, circled in BLUE you have activated the fuel pump circuit. Circled in RED you have not activated the relay to bypass the resistor.

You could check whats happening at your pump by seeing if you have 12v at the fuel pump, I suspect you don't currently.  If you want constant 12v at the pump (have no need for fuel pump speed control) then I would pair both pins into a single ecu output.

On 4/25/2020 at 11:50 AM, zsmitho said:

did yours not function at all with only the fc pin connected?

Yeah spot on, I did the exact opposite to you and only activated the resistor bypass circuit, so I had no power entering the fuel pump circuit.

JZX110 Wiring Diagram annotated.jpg

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