Corolla 1.4 d4d trouble starting - HELP PLEASE

underpaid

Hi guys, girlfriend has an 05 1.4 d4d corolla.

She drove home (50 miles) turned off car, went to start the following morning and nothing. Just engine turning over- like no fuel. Mechanic checked plenty fuel, injectors ok etc.

Now the only issue is when you go to turn on the car you get all lights on dash bar glow plugs and engine management light, checked all fuses etc. all good there.

When we went to plug in diagonistics in it wont allow him into ecu so he reckons ecu is gone?

Anyone ever come across this before? Any help greatly appreciated.

shamwari

Chances are that there is a relay or fuses blown somewhere. I would not condemn the ECU just because the mechanic cannot get comms to it.

underpaid

Hi shamwari,

Theres 75K miles on the car, the car was driving perfectly, she drove from home to cork city (approx 50 miles) with no issues, parked, turned off the car and went out the following morning and engine will turn over but no go. No glow plug lights and no engine management light coming on.

Have tried disconnecting the ecu over night and no good, mechanic checked all fuses twice and said all were fine.

Just cant understand that the car would drive perfectly and when she went to start it the following morning no joy.

shamwari

Your car is not one I'm terribly familiar with. However I have seen similar occur before on other cars (especially Opel Astra G) where the main relay would not kick in, causing very simialr symptoms to yours.

You will need an autoelectrician, mechanic, or toyota main dealer to look at this. Using a wiring diagram, they will need to check the supplies to the ECU, and if these are missing, trace them back to their source and see where the fault lies. If the correct feeds are reaching the ECU then it may well be faulty. Whilst possible, this is not an especially common occurence on these cars.

langdang

Do you have a spare key?
Try it in case there's some immobiliser problem

underpaid

Thanks for the advice shamwari, much appreciated, are you an autoelectrician yourself? Ever see a 1.4 d4d ecu go pop?

The weird thing is the same amount of light will show up on the dash with the ecu connected as without.

underpaid

langdang wrote: »

Do you have a spare key?
Try it in case there's some immobiliser problem

Tried that langdang, no use

shamwari

OP, Just to be clear about something: when you turn the key on, is the engine management light coming on briefly and then going out? Above you say it it out, and I took that to mean it wasn't coming on at all.

underpaid

Hi Shamwari - the engine management light and glow plug light are not coming at all.

The mechanic did further research online and It appears that the glow plug relay acts as a live for the ecu? Were hoping the issue may be with the relay and that is why we have no engine management or glow plug light and also why he cant access the ecu via diagnostic port.

Can anyone tell me where the glow plug relay is located in a 1.4 d4d corolla?

shamwari

underpaid wrote: »

Hi Shamwari - the engine management light and glow plug light are not coming at all.

The mechanic did further research online and It appears that the glow plug relay acts as a live for the ecu? Were hoping the issue may be with the relay and that is why we have no engine management or glow plug light and also why he cant access the ecu via diagnostic port.

Can anyone tell me where the glow plug relay is located in a 1.4 d4d corolla?

Again I'm not 100% familiar with that car, but it is quite likely that a duff relay or its supply fuses are the cause of your woes here. I'll see if I can hunt down a wiring diagram for that car and post back later.

underpaid

shamwari wrote: »

Again I'm not 100% familiar with that car, but it is quite likely that a duff relay or its supply fuses are the cause of your woes here. I'll see if I can hunt down a wiring diagram for that car and post back later.

Hi Shamwari, that would be fantastic, thanks again for your help, might be light at the end of the tunnel yet

The Muppet

The Glow Plug relay is a black and grey relay about 3-4cm square towards the right side of the engine bay.

PADRAIC.M

Just so you understand about the no comm probably, basically your engine ecu is not powering up if the light is not coming on, and without power you can't get comm, I'll check a bit later for you, I can get some info for you

shamwari

OP, I had no luck with a wiring diagram for the 1.4 D4D Corolla. I looked at the 1.4 Petrol Corolla and the Yaris D4D. In both cases, the relay powers up pin1 of the ECU. Sorry I can't be more specific than that. The guidance others can give here might be of more helpful.

shamwari

The Muppet wrote: »

The Glow Plug relay is a black and grey relay about 3-4cm square towards the right side of the engine bay.

Any idea where the engine control relay is? I've a feeling this is the one which should be looked at, not the glow plug one. The plugs will only be energised during startup, whereas the engine control one stays up whilst the key is in position 2.

underpaid

The Muppet wrote: »

The Glow Plug relay is a black and grey relay about 3-4cm square towards the right side of the engine bay.

Thanks Muppet will pass on info

underpaid

PADRAIC.M wrote: »

Just so you understand about the no comm probably, basically your engine ecu is not powering up if the light is not coming on, and without power you can't get comm, I'll check a bit later for you, I can get some info for you

Thanks Padraic, all help greatly appreciated.

underpaid

shamwari wrote: »

OP, I had no luck with a wiring diagram for the 1.4 D4D Corolla. I looked at the 1.4 Petrol Corolla and the Yaris D4D. In both cases, the relay powers up pin1 of the ECU. Sorry I can't be more specific than that. The guidance others can give here might be of more helpful.

shamwari wrote: »

Any idea where the engine control relay is? I've a feeling this is the one which should be looked at, not the glow plug one. The plugs will only be energised during startup, whereas the engine control one stays up whilst the key is in position 2.

Thanks shamwari, mechanic has spoken to some in Toyota garage who is hopefully goig to email him the required diagram, I will also mention the engine control relay to him.

The Muppet

shamwari wrote: »

Any idea where the engine control relay is? I've a feeling this is the one which should be looked at, not the glow plug one. The plugs will only be energised during startup, whereas the engine control one stays up whilst the key is in position 2.

I don't. sorry.

underpaid

Problem solved!!!!

Toyota mechanic looked at it and found a frayed wire going from the IF? relay (top fuse in fusebox beside airbox) back to ecu ran a new wire and got all lights back and started first turn. The relay was sending a live but no pulse.

Thank god it wasnt anything else major.

Thanks for all yer help.

sfarrell12

Hi I'm just wondering because I'm having the same problem with my corolla the same year and everything what do you mean by IF?? what does it stand for because I don't know where to start looking