VT error code 57

[muneey]

hi guys..i have a VT V6 commodore and lately its getting hard to start..i have to crank it for heaps before it starts..i have done a error code check and it comes up with 57..does anyone know what that relates too and how do i fix it??
any help will be much appreciated

[PRAVX II S]

Code 57 - Injector power supply voltage variation

Check EFI relay (Swap it over for another one then start the car.)
Check PCM connection and supply to the injector with multimeter. (PCM supplies Negative to the injectors)
PCM could be faulty.

[BoNeZ-01]

If that is the Ecotec, the same as the VS, then fault code 57 should be: Injector Power Supply Monitor (voltage variation, terminal B12).
That's according to my Gregory's VS book anyway..

[accentstencil]

Code 57: Injector power supply monitor (voltage variation, terminal B12)
That's all I can tell you.
Edit: A bit late I see.

[PRAVX II S]

The B12 terminal on the PCM.
Power comes from the EFI relay to the PCM B12 connection.
PCM triggers the injectors.

Add from previous post you can also check for signal at the B12 terminal positive supply (Use multi-meter)

[muneey]

The B12 terminal on the PCM.
Power comes from the EFI relay to the PCM B12 connection.
PCM triggers the injectors.

Add from previous post you can also check for signal at the B12 terminal positive supply (Use multi-meter)

thanxs for the reply prav..but for a noob like me im finding it hard to understand..where is the PCM and EFI relay located..also i do have a multimeter..how can i tell if the efi relay is stuffed??
would appreciate your any feedback you give..
cheers!!

[PRAVX II S]

PCM is located on the passenger side kick panel.
The EFI relay I think is located under the bonnet. Open the bonnet and were your window washer is near the battery there should
be a plastic cover under there should be the relays/fuses. (On the bottom of cover there should be a diagram of whats what.)
The EFI relay is a 4 pin relay (It has 4 legs underneath/connections)
Swap the EFI relay over with a identical one try the air-con relay check if it is the same. And try to start it.
For the PCM check I would suggest get a mate or auot-elec to do it if your not confident because you can stuff the PCM up if you short pins.
And there is more things involve in testing.

[muneey]

prav, your advice has been great so far..i have access to a multi meter..can you please tell me what i need to do to check the PCM and what i should be looking for?
is there anyway of checking the EFI relay with a multi meter also?? i dont know anyone with a commodore to swap the relay with..
i do have LPG installed, but the problem happens on either gas or petrol, either cold or warm..

[PRAVX II S]

If your car is fitted with air-con then I think the relay will be identical. So just swap the air-con relay with the EFI one in your car make sure there the same though. I think the air-con relay is under the bonnet with the other relays?
For the PCM you will need to find the injector trigger wires on the PCM I don’t know the colors of my head. But they supply a negative to the injectors.
So you will need to see how many volts are coming out of the wires (There will be a couple of injector wires)

[muneey]

If your car is fitted with air-con then I think the relay will be identical. So just swap the air-con relay with the EFI one in your car make sure there the same though. I think the air-con relay is under the bonnet with the other relays?
For the PCM you will need to find the injector trigger wires on the PCM I don’t know the colors of my head. But they supply a negative to the injectors.
So you will need to see how many volts are coming out of the wires (There will be a couple of injector wires)

prav..the a/c relay is the same as the fuel pump relay (both in engine bay)..where would the EFI one be??

[PRAVX II S]

Don’t use the Fuel pump relay because you need it to run the car. Use the Air-con one.
If there is no EFI relay under the bonnet were the fuel pump one is (Check under the fuse cover for what relay is what). Check inside the car (drivers side)There is a panel that sits under the steering wheel pull this panel out and you will see another fuse box

[muneey]

mate ive looked high n low for this efi relay..cant find it..ive looked in the engine bay, ive looked under the steering, like youve suggested..still cant find the bloddy thing..its a VT calais if that helps..any idea where it could be?

[PRAVX II S]

Its should be under the bonnet mate. Is there a relay that says IGN? try this
turn the reds on.
Take the relays out one by one (dont mix the relays up one by one)
If you have taken out the right relay then there will be no power on the B12 on the PCM. Thats your efi relay. (when reds are on there will be power on this terminal so by taking the relay off you will kill the power to it and thats your EFI relay.(use multi meter)
So taking relay out and making sure there is no power at the b12 terminal on the PCM.

[mickymodge4]

is the car on dual fuel???? if its on dual fuel this code is normal

[PRAVX II S]

is the car on dual fuel???? if its on dual fuel this code is normal

Could be true, I have not had much EXP with lpg just petrol as a auto-elec

[muneey]

is the car on dual fuel???? if its on dual fuel this code is normal

why is that?? i dont think i ever remember this code coming up before..its not a factory LPG conversion if that matters..
PRAV, are you saying that the EFI relay is the one that says IGN?? i would have thought that this would be something to do with the ignition?
if this code 57 is normal, i wonder what else is causing this to happen..its becoming a pain in the ass..sometimes it takes ages to start..just keep on crankin and crankin..sometimes it fires straight away..anyway its doing my head in..

[PRAVX II S]

why is that?? i dont think i ever remember this code coming up before..its not a factory LPG conversion if that matters..
PRAV, are you saying that the EFI relay is the one that says IGN?? i would have thought that this would be something to do with the ignition?
if this code 57 is normal, i wonder what else is causing this to happen..its becoming a pain in the ass..sometimes it takes ages to start..just keep on crankin and crankin..sometimes it fires straight away..anyway its doing my head in..

Try the IGN relay and see if it takes power off b12 on the pcm and swap the IGN relay over for the same one.

[codeunknown]

no it will be the contoller marked relay does the EFI

[PRAVX II S]

no it will be the contoller marked relay does the EFI

Yeh i know that but this dude cant find it under the bonnet so i thought to give that i try.