VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed]

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Sat 22 Dec 2018 02:51
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - mannyman

Hi I decided to continue from the previous thread I made and I need help with multiple problems I found within my car. I ran diagnostics on the car and here are the full results:

www.scribd.com/document/396165300/TEST-VW?secret_p...b

Physical symptoms:

- In cold weather car has problems starting up

- ABS light is on

- Slow response and communication with brakes.

- Car shuts off randomly during driving or starting. Does not happen always but sometimes.

- When AC is on it makes a strange loud noise, I am guessing it needs a full service

Anyone got any solutions?

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Sat 22 Dec 2018 07:51
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - hardway

check for good power and grounds to the modules.

Not with a volt meter,

you need to "see" if they can carry current.

I use a indicator bulb and fly leads.

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Sat 22 Dec 2018 08:27
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - elekie&a/c doctor
Fault codes are only half the story. You can't fix problems on these alone. Can you access any live/ real time data in any of the modules?
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Sat 22 Dec 2018 09:51
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - hardway

So re reading your data if it were in here with me now I'd begin with a battery/power system check.

the fact that you have multiple comms loss is pony.

One of the few times you use a meter.

voltage across the battery?

V at terminal 5 and v at terminals 1 and 2?

back probe only.

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Sat 22 Dec 2018 16:41
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - mannyman

Sorry I forgot to mention I am not technical in electrical stuff so I have no idea what any of you guys are asking me to do. Only thing I understood is I need to check for good power and grounds on the modules and to test if the battery is fine right? Maybe if you guys explain in a way a absolute beginner like myself can do to check power and stuff. I do have a multimeter which I can use

And I think I could access real time data on the modules if you mean using the delphi diagnostic right?

Also I did not understand what you meant with any of this : '

voltage across the battery?

V at terminal 5 and v at terminals 1 and 2?

back probe only.'

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Sat 22 Dec 2018 17:57
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - elekie&a/c doctor
Simple question,does your tester have the ability to read the data actual values of each control unit? For example , if you select the engine control system , can you read ecu voltage, coolant and air temperature?
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Sat 22 Dec 2018 18:38
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - mannyman

Yes there is a real time data feature where I can see all the data like live RPM, voltages and stuff for each component. But when I carried out the tests yesterday the only components which did not respond to the test were Engine and Gearbox. I got message 'System did not respond' when I was trying to connect directly to the Engine. In the diagnostic scan results that I showed on this thread you will notice there is no mention of Engine or Gearbox as the system did not respond to even a full scan yet alone see its real time data. I should have mentioned that on thread but hope that helps!

Edited by mannyman on 22/12/2018 at 18:42

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Sat 22 Dec 2018 18:54
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - hardway

'System did not respond'

basically your problem.

All modules must communicate with each other.

it's a lot more complex than that but that's enough for a beginner.

Starting with the battery,

12.6 MINIMUM measured across the battery terminal.

anything less and the battery is goosed.

this is engine off.

do this then get back.

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Sat 22 Dec 2018 19:21
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - mannyman

It is reading 12.43 volts on my multimeter while engine is off. So does this mean I need to change my battery? What is the next step ?

Edited by mannyman on 22/12/2018 at 19:30

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Sat 22 Dec 2018 19:54
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - elekie&a/c doctor
My next step would be to take the car to someone that understands what’s going on. Sorry to be blunt. Understanding diagnostic systems does not happen overnight.
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Sat 22 Dec 2018 22:14
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - Railroad.
My next step would be to take the car to someone that understands what’s going on. Sorry to be blunt. Understanding diagnostic systems does not happen overnight.

I second thst. The OP openly admits he doesn't understand what he is being advised to do. Playing around with a modern car with little or no knowledge is asking for trouble. Find a competent technician or garage near you and take your car there. Playing around yourself is going to cost you a fortune.

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Sat 22 Dec 2018 23:06
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - mannyman

I do understand some things and I did manage to check the voltage of the battery so I am not completely stupid. I admit I do not know the advanced stuff but atleast I can save some money working out the problem myself instead of paying £50 to a mechanic to do diagnostics. I am on a tight budget because I am a student, I am going to have to pay for parts and labour anyway so I thought I might aswell save some money and do the diagnostics myself. I mean what could go wrong by just following steps from you guys?

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Sat 22 Dec 2018 23:07
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - mannyman

Also I do plan to take it to a local garage but not until I know what the problem is so it makes the process easier and less costly.

So can anyone tell me whats next? Does the battery need replacing since the voltage is low?

Edited by mannyman on 22/12/2018 at 23:08

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Sun 23 Dec 2018 01:50
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - hardway

battery voltage acceptable at this point.

now check V at the ECU multi plug,

bigger plug terminal 1 2.

1 should be ig on battery v

2 should be ground.

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Sun 23 Dec 2018 05:21
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - mannyman

battery voltage acceptable at this point.

now check V at the ECU multi plug,

bigger plug terminal 1 2.

1 should be ig on battery v

2 should be ground.

You want me to test V for these ? imgur.com/FlvGDL8

Or the actual plugs connecting to it? And the bigger one right?

Also where do I put black and red terminals on what pins?

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Sun 23 Dec 2018 12:53
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - dieselnut

Just my four peneth, but all your fault codes relate to loss of communications with the ECU & all say INTERMITTENT.

You have also said the car has completely cut out & stopped at times.

So I would be checking all the connexions/ fuses that supply power to the ECU as a starting point.

I don't have access to any wiring diagrams for this car so can't give you any pin or fuse numbers.

Look in the cars user book for fuse numbers relating to the ECU.

But i'd check all the connexions at the engine fuse box, make sure there is no corrosion/ loose conexions or loose/ corroded fuses.

Check all the battery conexions for corrosion loose conexions & where the earth lead bolts to the chassis.

The battery voltage should quickly rise to over 14v when the engine is running.

Your A/C is reporting low pressure so probably has a leak & lost the refrigerant gas.

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Sun 23 Dec 2018 14:10
VW polo 1.4tdi 2007 - VW polo diagnostic stats [help needed] - Railroad.

check for good power and grounds to the modules.

Not with a volt meter,

you need to "see" if they can carry current.

I use a indicator bulb and fly leads.

Many people misuse a voltmeter because they don't properly understand what it does. One thing is certain. A voltmeter does not know how to lie. What the display says is what's happening.

A voltmeter measures the potential difference between two points of a circuit. It does not measure nor does it indicate presence of current. It's an excellent diagnostic tool if used correctly,

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