C180: engine turns but does not start please help

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Its in the control box under the bonnet
 

bigasotonuk

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Hi,
Under the bonnet passenger side, just in front of the windscreen is where my ECU lives, though I believe some early C classes have a control unit fitted under the washer bottle.
 
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benlauren

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Many thanks to Malcolm and Andy. Right so back to the question of do I need to do anything else apart from simply replacing it? and can I do that myself or do I need a guy with a special tool?
 
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Just read back and the car is a 1996 so it is just plug and play
 
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Carl Hills

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My petrol vito has the same engine. I left it standing for three months then it would not start. I took the injectors out, checked the fuel, plugs etc. Nothing wrong. I bought a diagnostic socket tested it and it ws the crank sensor, I think the end gets rusty and won't read. I bought a new one (£85) and it worked fine. You may get away with cleaning the rust off the end but it is very tight and hard to remove without damaging the cable. I would bet it is the crank sensor. If your crank sensor doesn't know where top dead centre is, it won't spark and inject at the right point.

Good luck Carl
 
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benlauren

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Hello

My petrol vito has the same engine. I left it standing for three months then it would not start. I took the injectors out, checked the fuel, plugs etc. Nothing wrong. I bought a diagnostic socket tested it and it ws the crank sensor, I think the end gets rusty and won't read. I bought a new one (£85) and it worked fine. You may get away with cleaning the rust off the end but it is very tight and hard to remove without damaging the cable. I would bet it is the crank sensor. If your crank sensor doesn't know where top dead centre is, it won't spark and inject at the right point.

Good luck Carl

but the garage says they have tested it and it is fine!! Could it be they are not telling me the truth? They showed me a new crank sensor in the box! I have to take their words for it. I found a box (# 140 as Malcolm said) under the washer bottle and have taken it out. The car is about a mile away and i have already made three trips there and back. If the crank sensor is the root cause of the problem I shall slit my wrist.
 

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A simple ohm meter will tell you, 1 k ohm when good
 
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benlauren

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A simple ohm meter will tell you, 1 k ohm when good

Thanks mate I have to make another trip to the car with some spanners. Seems a must do before i embark on anything else. Will let you know.
 
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benlauren

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I manged to get a reading from the CPS and it reads 0.825 ohms.
 

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That cannot be right unless it has gone short circuit

82.25K could be OK but not 0.825 ohms
 
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benlauren

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That cannot be right unless it has gone short circuit

82.25K could be OK but not 0.825 ohms

I put the multimetre on 2k max and that's what i got. Sry that means 0.825 kohms
 
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television

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I put the multimetre on 2k max and that's what i got. Sry that means 0.825 kohms

I am not awake yet and that looks to be OK, and near enough 1KΩ , they are funny things to measure as the field set up from the battery in the meter apposes the reading
 
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benlauren

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I am not awake yet and that looks to be OK, and near enough 1KΩ , they are funny things to measure as the field set up from the battery in the meter apposes the reading

so the cps is ok then? the garage said they put a new one in but still no joy.
 

television

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so the cps is ok then? the garage said they put a new one in but still no joy.

Its OK and they were telling the truth,,sorry about the keeping fit bit, but I hate anyone buying things that they do not need
 

television

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Oh thats it then. can't afford that. It is a shame because it has been a lovely car. Still taxed and the tank is full.

There are loads of these being broken up, you should get one cheap
 

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