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No power to ICM, CAS and fuel module.

Chris72
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Chris72 Rookie

Chris72

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Hey folks new to the community but just bought a GTR R32. I have literally racked my brain on all this. But lost power to ICM, CAS and the fuel control module. Everything else has power but those any ideas? Or think it's a relay that controls all 3 of them. It is dyno tune with a Haltech ECU. I did replace ICM and CAS thinking would fix issue until I also found that I was not get fuel pressure. 

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TurboTapin Experienced

TurboTapin

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I'm presuming by ICM you mean igniter? And by fuel control module, the FPCM in the boot? There's not many links between all three that would not cause a bunch of other things not to work.

Check your 30A fuses in the engine bay fuse box. 

Chris72 Rookie

Chris72

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On 7/21/2022 at 4:57 PM, GTSBoy said:

What is an ICM?

Beyond that question.....pull out the wiring diagram and the multimeter, and go to work finding where the power isn't.

ICM ignition control module or igniter for coils

 

Chris72 Rookie

Chris72

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On 7/21/2022 at 5:29 PM, TurboTapin said:

I'm presuming by ICM you mean igniter? And by fuel control module, the FPCM in the boot? There's not many links between all three that would not cause a bunch of other things not to work.

Check your 30A fuses in the engine bay fuse box. 

I checked all the fuses and they are all good. Yes there is no power get to FPCM. No power to the fuel pump but the fuse inside are also good. 

 

TurboTapin Experienced

TurboTapin

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On 7/21/2022 at 9:01 PM, Chris72 said:

I checked all the fuses and they are all good. Yes there is no power get to FPCM. No power to the fuel pump but the fuse inside are also good. 

 

Which FPCM wire is not getting 12VDC? Your fuel pump 12V does not go through FPCM. Both are separately powered by your fuel pump relay which is powered by #8 15A fuse. 

Chris72 Rookie

Chris72

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On 7/21/2022 at 6:07 PM, TurboTapin said:

Which FPCM wire is not getting 12VDC? Your fuel pump 12V does not go through FPCM. Both are separately powered by your fuel pump relay which is powered by #8 15A fuse. 

Yes and that fuse is good. I tested that with a test light on both pins of the fuse. So where exactly is the fuel pump relay located at. Because I am not seeing it at all. And most are saying it's green and behind boot of drivers seat.

TurboTapin Experienced

TurboTapin

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On 7/21/2022 at 9:16 PM, Chris72 said:

Yes and that fuse is good. I tested that with a test light on both pins of the fuse. So where exactly is the fuel pump relay located at. Because I am not seeing it at all. And most are saying it's green and behind boot of drivers seat.

It's in the trunk between both tail lights behind cover. It's green. 

Duncan Grand Master

Duncan

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haha fuel pump relay always used to be in the boot, these days it is in the trunk!!

the fuel computer varies the earth not the power to the pump (and, generally you would chuck it and harwire the earth, and replace the factory feed with a wire with fuse from the battery to the fuel pump relay (or a replacement) so you get a proper 13.x volts at the pump.)

It would be worth checking if the signal side of the fuel pump relay is turning on. I think you have an ECU power or ECU issue.

Chris72 Rookie

Chris72

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On 7/21/2022 at 9:23 PM, GTSBoy said:

There's only one way to fix this stuff.

f**king test light! A multimeter is $10. !!!!!!!!!1 one juan

You must think I am stupid. This is a new vehicle to me. It doesn't list where relays are at and yes that is what I been using is a f**king test light and multimeter. Now that someone pointed me in right direction to relay yes I two points of power to relay but not a 3rd point which comes from the ECU side. So really get over yourself thinking your all that shit and better than anyone else on repairing a vehicle. Geez. 

Chris72 Rookie

Chris72

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On 7/21/2022 at 9:34 PM, Duncan said:

haha fuel pump relay always used to be in the boot, these days it is in the trunk!!

the fuel computer varies the earth not the power to the pump (and, generally you would chuck it and harwire the earth, and replace the factory feed with a wire with fuse from the battery to the fuel pump relay (or a replacement) so you get a proper 13.x volts at the pump.)

It would be worth checking if the signal side of the fuel pump relay is turning on. I think you have an ECU power or ECU issue.

That is the issue I found I get power to relay when it closes the switch it should send power to feed fuel computer and pump. There should be 2 points of power to relay one from ECU and one to earth. When relay closes not getting voltage from ECU side. So that's my issue. Ordered a new Haltech ECU for it. 

Duncan Grand Master

Duncan

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So like I said, it is consistent with teh ECU not having power (no fuel pump signal, no cas, no ignitor power). Can you connect to the ECU when the ignition is on through USB?

There are 2 relays near the passenger a pillar (blue, or apparently sometimes green!). One is for ignition power, the other powers the ECU. Check they both have power coming in from battery, and both relays turn on (click, and provide power output) when the key is at IGN

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