Clio 172 No power at coil cables\plugs

[pedro1987]

hi mates

I have a clio 172, the engine runs fine but will not start.

Has fuel, pump is okay, but no energy in the coil cables / plugs.

crankshaft sensor is new.

What else can it be?

 

[montana]

hi mates

I have a clio 172, the engine runs fine but will not start.

Has fuel, pump is okay, but no energy in the coil cables / plugs.

crankshaft sensor is new.

What else can it be?

Have you checked the +ve connection to the coil pack (inside the plug, 3rd metal pin). Is it getting 12V?

If so - do you have a spark at the coilpack end (to test- remove a lead and rest it close to the top of the coilpack - you should be able to see it sparking when cranking). If you have a spark then check the plug end of the lead for a spark.

If not then its a wiring issue between the battery and the coil pack connector.

Hope this helps.

 

[pedro1987]

I'll check. 3rd pin of the plug from the coil? right?

thank´s mate

 

[Mr bean]

when you put the key in the ignition and turn the key does the engine turn over ? does the led in the insturment panel flash when cranking over ?

 

[pedro1987]

when you put the key in the ignition and turn the key does the engine turn over ? does the led in the insturment panel flash when cranking over ?

Yes the engine turns.

 

[pedro1987]

Have you checked the +ve connection to the coil pack (inside the plug, 3rd metal pin). Is it getting 12V?

If so - do you have a spark at the coilpack end (to test- remove a lead and rest it close to the top of the coilpack - you should be able to see it sparking when cranking). If you have a spark then check the plug end of the lead for a spark.

If not then its a wiring issue between the battery and the coil pack connector.

Hope this helps.

12v has the 3rd pin. coil/plugs cables has no power.

 

[montana]

So there is no spark between the top of the lead and the coilpack connector - you may need an assistant to help crank the engine whilst you have a look & you may need to move it closer, trial and error really.

BUT if you have 12v to the coilpack but no spark then my guess is on the coilpack - try a working second hand one if you can before paying for a new one.

 

[pedro1987]

I'll try to find a used coil.
This is tricky because there are few clio 2.0.

There is another model that uses a coil with the same reference?

 

[pedro1987]

Today I tried a coil used, but still without power in the plug wires. What can I check more?

 

[montana]

Was the coil in working order ?

How secure is the wire/coilpack connection ? Does it have the retaining clip fitted?

Is it definitely not sparking , have you tried moving it closer and having someone else crank the engine?

 

[pedro1987]

The retaining clip is from the plug coil, right?
Yes it has.

I can not understand because they never have the energy in the coil.

 

[Fred@BTM]

check the relays in the engine bay fuse box, if there's isn't a 12V feed to the coil you need to see why

 

[pedro1987]

Has 12v plug in the coil. But the coil cables have nothing

 

[MicKPM]

If the coilpack has 12v reference power and is known to be working on another vehicle then there is only one reason it won't be firing and that's the trigger lines aren't being controlled. These are ECU controlled earths and the only thing that normally stops these firing is when the ECU itself does not see/recognise "rotation" (Normally due to a fault on the crank sensor circuit).

Why was the crankshaft sensor replaced? Was it the newer blue unit and was the short wiring loom replaced at the same time?

Mick

 

[pedro1987]

I replaced because the old one was in bad shape.

The new one is black, but not changed the wiring.

How to evade this problem you say?

 

[Fred@BTM]

so you have 12V at the big white wire on the coil? crank sensor is probably shot

 

[pedro1987]

I have 12v at the 3rd pin of the plug coil

 

[MicKPM]

The older crank sensors and the multiplug are a common weak point which is why Renault have updated them both to a newer "Blue" unit. I just wondered if this had been fitted when you changed the crank sensor as getting the wires the wrong way round would most likely cause this issue.

Ideally you need someone to look at the ECU's live data parameters to see if it is "Seeing" rotation when you turn the ignition key (eg - It is displaying an RPM value other than 0rpm when cranking) followed by a quick session on a scope to rule out an actual sensor VS wiring fault. As they're fairly cheap though you could just gamble and replace the sensor as Fred said above as it's most likely goosed.

Mick

 

[pedro1987]

So it would be better replaced by a blue sensor with new wiring?

 

[MicKPM]

Ultimately yes but really, I prefer to know what the actual problem is before going out and spending money on parts based on a guess as it *may* be a wiring issue somewhere in the gearbox loom area (another common fault area on the X65)

 

[pedro1987]

even better is to do with the diagnosis of renault clip.

 

[MicKPM]

It doesn't have to be CLIP, any decent diagnostic equipment should be able to see engine speed via the CAN/K-Line or via generic EODBII. Just bare in mind that the data output may be slow via a generic interface especially via something like ELM Scan but that doesn't matter for the purposes of this exercise... if you see the RPM value move from 0rpm to say 250-300rpm when cranking then the ECU is seeing rotation and the issue isn't with the Crank sensor.

 

[pedro1987]

I've even made ​​a diagnosis before and had no sensor error. but I will check again if it sends signal.

 

[MicKPM]

Crank sensors never flag a fault code, you have to look at the engine speed parameter to see if its working or not

 

[pedro1987]

I have not found the problem. I think I'll risk it and swap cables candles, and ignition module

 

[pedro1987]

when I try to put the engine on the 12v of 3º pin plug from the coil, go to another pin right?

 

[pedro1987]

problem solved, replaced the sensor wiring

 

[murraymints1988]

I have 12v at the 3rd pin of the plug coil

hi did you get to the bottom of the issue i have the very same with my 172 power at the 3rd pin and no spark