Golf 4 Fault Code (Solution)

10-11-2013, 9:01 Subject: Golf 4 Fault Code

Hello

On a Golf 4 AXR, manufactured in 2004, I have the following errors:

17932 - Fuel Pump Relay (J17)
P1524 - 35-10 - Intermittent/Short to Ground - Sporadic
17849 - Exhaust Gas Recirculation Valve (N18)
P1441 - 35-10 - Intermittent/Short to Ground - Sporadic
19557 - Engine for Intake Valve (V157)
P3101 - 35-10 - Intermittent/Short to Ground - Sporadic
17957 - Solenoid Valve for Lift Pump Pressure Regulation (N75)
P1549 - 35-10 - Intermittent/Short to Ground - Sporadic
17903 - Shutter Valve for Radiator Exhaust Gas Return (N345)
P1495 - 35-10 - Intermittent/Short to Ground - Sporadic

These cannot be deleted anymore. The car drives normally for a short time, then enters emergency mode.

This whole thing has been going on for about 2 years now.

Initially, the problem was just with the fuel pump relay.
The error only occurred in winter and very rarely.

The current error rate has only been very high for a few weeks.

So far, I have done the following:

Fuel pump relay replacement.
Fuses checked. Okay.
Power supply to the connectors checked.
Extra power supply connected to the connector. Errors persist.

From my perspective, the control unit has been damaged.
What do you think? Since the control unit isn't particularly cheap, I would appreciate any further opinions.

My neighbor has the same engine with the same year of manufacture. Unfortunately, I was unable to replace the control units due to the WFS. Otherwise, I would have just swapped them.

Best regards, Bolzer

10-11-2013, 11:07 Subject: Golf 4 Fault Code

I would have initially also guessed that there was an error in the plus supply of the actuators, especially since a large portion of them are connected to the same yellow/black cable.

Everything seems to be connected behind J317 (Relay, KL30). To be honest, I haven't really looked deeply into the SLP to see if this failure necessarily requires other errors. But I would replace this one first. Located on the 13-way relay block above the relay panel as relay 12 (2nd row, 2nd from the right, No. 109).

Greetings
Guste

10-11-2013, 11:16 Subject: Golf 4 Fault Code

Hi,

Quote:

Extra power supply connected to the connector. Errors persist.

- i.e. Did you provide all the "problem children" with 12V separately?
In this case, the idea related to J137 would be obsolete (?).
hg
Herbert

10-11-2013, 11:28 Subject: Golf 4 Fault Code

Hi
I did not operate them all separately with a power supply.
Instead, I went with the T10 connector and took a yellow/black wire, and I connected this directly to the battery.
Since everyone is connected, everyone has been provided for.

At least, this one actor (specifically, the N18)) wouldn't have had to report any more errors.
And it is definitely the case that everyone was definitely supplied with electricity. I checked with a multimeter.

Bolzer

10-11-2013, 14:58 Subject: Golf 4 Fault Code

I think you're looking on the wrong side... The mass is clearly missing, not the tension!

10-11-2013, 15:00 Subject: Golf 4 Fault Code

Quote:

And, of course, everyone was definitely supplied with electricity. I checked with a multimeter.

...also auch mal gegen die Masse gemessen?

Often, the wiring harness is to blame. Just beneath the rigid conduit, you often find rubbing points, or exposed pipes.

10-11-2013, 15:08 Subject: Golf 4 Fault Code

Bertil wrote:

I think you're looking in the wrong place.... The mass clearly lacks excitement!

Dear Bertil,

how do you figure that out? All the actuators are connected via relay 109 to +12V. The other side is contacting MSG.

Furthermore, the message "Short circuit to ground" also more likely indicates a missing power supply voltage rather than a missing ground. Or have I made a mistake in my thinking?

Greetings
Guste

10-11-2013, 15:31 Subject: Golf 4 Fault Code

guste100 wrote:

Furthermore, the message "Short circuit to ground" also more likely indicates a missing power supply voltage rather than a missing ground. Or have I made a mistake in my thinking?

If you read the message like this, you are correct, but it still says "Interruption/Short to Ground".

And Right... the mass of the actuators and sensors goes through the STG... This mass can sometimes cause problems and lead to these specific errors... The entire information should be found through the search function in the forum.

10-11-2013, 16:20 Subject: Golf 4 Fault Code

Quote:

Furthermore, the message "Short circuit to ground" actually points more towards a missing supply voltage than a missing ground. Or have I made a mistake in my thinking?

Actually "Interruption / Short to Ground". The MSG expects 12V at the actuator connections and sees nothing/something at an open input.

Bolzer has already tried the alternative 12V power supply without any changes. That several input monitoring systems would say goodbye at the same time would be surprising.
Take a look at the connections from the actuators to the MSG.
hg
Herbert

10-11-2013, 16:23 Subject: Golf 4 Fault Code

Hi
I just went to the car for a quick look.
The lines are not shorting to ground.
Neither plus nor mass conduits.
Measured using the T10 connector.

In normal operation, the ground point of the N18 has a voltage of 1.5-1.6V.

Greetings
Bolzer

10-11-2013, 16:30 Subject: Golf 4 Fault Code

Hi,
Could you please repeat the measurement on a non-timed section (e.g., voltage drop across V157)?
hg
Herbert

10-11-2013, 16:50 Subject: Golf 4 Fault Code

Hello Herbert

Re-performed the measurement at J157.
4 Pol. Plug Ground Pin 3 Bl/Gn 0,64V
4 Pol. Plug Ground Pin 4 Sw/Rt 10.6V

Greetings

Bolzer

10-11-2013, 20:33 Subject: Golf 4 Fault Code

Hi,
Have you measured with the consumer connected? Under what operating conditions?

Regarding the operation of the suction valve, I am not entirely sure, so I would like to ask as a question.
- Turn off ignition: Vent open,
- Ignition on, Start, Engine running: Valve open;
- Stopping: The motor is powered on, and the door closes.
hg
Herbert

10-11-2013, 22:32 Subject: Golf 4 Fault Code

Hello Herbert

I measured it while the engine was running and on the connected plug.

Unfortunately, I didn't pay attention to the valve position, as the hoses were also attached.

I can, of course, watch it again tomorrow.

Best regards, Bolzer

11-11-2013, 9:45 Subject: Golf 4 Fault Code

Bolzer wrote:

Hello Herbert

I measured it while the engine was running and on the connected plug.

Unfortunately, I didn't pay attention to the valve position, as the hoses were also attached.

I can, of course, watch it again tomorrow.

Best regards, Bolzer

Hello,

The TDIs in the Golf 4 do not operate with a mechanically actuated throttle valve. This is controlled solely by a solenoid, except in the case of AXR/ATD, and vacuum is applied to the suction tube valve actuator.
Low pressure = Close the flap, the engine will stop.

Regarding the errors, I suspect it's due to [MARDER DAMAGE/SCRATCHES] on the wiring harness. With a bit of bad luck, the traces on the circuit board may be damaged (repairable).

As long as the cause is not found, installing a new control unit makes no sense, as it is highly likely that the same thing will happen.

Best regards, Rainer

11-11-2013, 11:22 Subject: Golf 4 Fault Code

Bertil wrote:

Furthermore, the message "Short circuit due to ground" actually points more towards a missing power supply voltage than a missing ground.

guste100 wrote:

Or have I made a mistake in my thinking?

If you read the message that way, you are correct, but it does indeed say "Interruption/Short to Ground". IMO, the message should be interpreted as meaning that the actor's control connection is always in the "Ground" voltage range, even when the MSG power amplifier is not active.

Possible Causes:
1. Series connection in the MSG stage or in parallel
2. Actor's interruption (Last resistance)
3. The actor's comprehensive care is lacking / has been interrupted.