Engine Starting: No Gas Intake - Special Issue

Hello fellow diesel mechanics,

I also encountered an electrical problem during the installation of the auxiliary heater.
You're already moving the cables under the dashboard and in the area where the water tank cables pass through.
The error memory is empty, and the problem only occurs once after starting the engine. After that, everything is normal until the next start.
As the diagram shows, the car reduces the fuel injection amount once a certain speed is reached. This happens in both first and second gear, as soon as the speed is exceeded when accelerating. After releasing the accelerator pedal, it then continues as normal.

Where should I look? I would really appreciate any tips.

Best regards and thank you!
Findus.


Vehicle type: 1J - VW Golf/Bora IV.
Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75
76

Vehicle Identification Number: WVWZZXXXXXXXXXXXX
Mileage: XXXXXX km
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
Address 01: Engine Label file: RKS\038-906-019-AXR.lbl
Part number: 038 906 019 DD
Component: 1.9L R4 EDC 0000SG 1518
Encoding: 00002
Operating number: WSC 01266
VCID: 5CB3E6D2E6BB
WVWZZZXXXXXXXX VWZ7Z0B5XXXXXX

No errors found.
Readiness: 0 0 X X X

"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
Address 03: Brakes Label file: RKS\1C0-907-37x-ABS.lbl
Part number: 1C0 907 379 L
Part: ABS FRONT MK60 0101
Encoding: 0001025
Operating number: WSC 01266 785 00200
VCID: 33616D6E2BA5

No errors found.

"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
Address 15: Airbag
Label file: RKS\6Q0-909-605-VW5.lbl
Part number: 1C0 909 605 A
Part: 27 AIRBAG VW51 01 0004
Encoding: 12855
Operating number: WSC 01266
VCID: 224F982A845F

No errors found.

"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
Address 17: Combination Instrument
Label file: RKS\1J0-920-xx5-17.lbl
Part number: 1J5 920 806 G
Component: COMBINATION INSTRUMENT + SPEEDOMETER VDO V11
Encoding: 01112
Operating number: WSC 00000
VCID: 306B6262DAB3
WVWZZZ1JZ3W040134 VWZ7Z0B5135867

No errors found.

"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
Address 19: CAN-Gateway
Label file: RKS\6N0-909-901-19.lbl
Part number: 6N0 909 901.
Component: Gateway K<->CAN 0001
Encoding: 00006
Operating number: WSC 01266
VCID: F0EB22629A33

No errors found.

"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
Address 46: Comfort System
Label file: RKS\1C0-959-799.lbl
Part number: 1C0 959 799.
Component: 1F Comfort Device HLO 0001
Encoding: 00259
Operating number: WSC 01266
VCID: F4E32E72EE2B

Part number: 1C1959801A
Component: 1F Tõrsteuer.FS KLO 0004

Part number: 1C1959802A
Component: 1F Throttle Control.BF KLO 0004

Part number: 1C0959811A
Component: 1F Throttle control.HL KLO 0004

Part number: 1C0959812A
Component: 1F Throttle Control.HR KLO 0004

No errors found.

"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Ein leichter Wind weht durch die Bäume, und die Blätter rascheln leise. Es ist ein wunderschöner Tag, um draußen zu sein."
Address 56: Radio
Label file: RKS\1J0-035-15x-56.lbl
Part number: 1J0 035 152 F
Component: Radio BNO 0006
Encoding: 00001
Operating number: WSC 01266
VCID: 214D97268159

No errors found.

End.

It would be interesting to see the air mass, target boost pressure, and actual boost pressure values.

Best regards, Rainer.

Sure!

Best regards,
Findus.

Please log where the problem occurs...

Saying "hey, I have a problem" and then pointing out where everything is fine doesn't really make sense, does it?

I'm sorry, I'm still practicing.

So, I hope it's now clear what's going on.

Greetings and thank you!
Findus.

What are your brake lights telling you? Is it possible that the brake switch is stuck or broken?

I'll check that out, but not until the weekend.
Thanks for the tip, I heard they tend to break easily.

best regards
Findus.

After the initial hiccup, does it then function normally?
If you let it run in neutral for about 30 seconds, will it then work normally again, or not?

Hi.

Here's another tip regarding the diagrams:

I find spline interpolations a bit excessive for such coarse data points.

They are creating a false impression of a smooth, gentle measurement curve that doesn't actually exist.
Strictly speaking, linear connections aren't necessarily better either, but the jagged edges tend to indicate to the viewer that things are a bit more rough around the edges here.

m;

Hello,

How can the acceleration be related to the RPM "as usual" (= nothing or something?) when there is absolutely nothing discernible in this log?

Check the brake pedal sensor, etc. (see also the corresponding bits in the measurement block within the engine control unit, see the label file), or the boost pressure may be too low (is there a leak in the charge air system?). The relatively low air mass also doesn't quite fit with this.

Best regards, Rainer.

Hi,


How did you connect the fuel line for the auxiliary heater?
As intended, either by taking a separate sample from the fuel tank or from the fuel line in the engine compartment?

Bye.

Jürgen.

mserge wrote:

After the initial hiccup, does it then function normally? If you let it run in neutral for about 30 seconds, will it then work normally again, or not?

I will check that tomorrow; otherwise, I always end up leaving normally after a short time after the start.

dieselschrauber wrote:

Hello, How can the acceleration be related to the RPM "as usual" (= nothing or something?) when there is absolutely nothing discernible in this log? Check the brake pedal sensor, etc. (see also the bits in the corresponding measurement block in the engine control unit, see label file), or the boost pressure may be too low (is there a leak in the charge air system?). The relatively low air mass also doesn't quite fit with this. Best regards, Rainer

Okay, let me clarify: When I'm in first gear, I engage the clutch, then hold a certain position on the accelerator and accelerate, I reach the point where the automatic throttle cut-off kicks in.
The acceleration remains reduced, regardless of how long I stay in that position or even if I press the accelerator further. Only after releasing the accelerator pedal completely to 0 and then pressing it again can you accelerate normally.

In second gear, the situation is different. I didn't need to ease off the accelerator; instead, he accelerated after the "dip" as would be expected for second gear and the gas pedal position. Unfortunately, the road ended there, and I didn't want to turn around again.

I will test the brake pedal switch this weekend.

The actual mass airflow value is already significantly lower than the target value. Are there any standard diagrams available that show what it should look like when there is no fault?

comco wrote:

How did you connect the fuel line for the auxiliary heater? As intended, either by taking a separate sample from the fuel tank or from the fuel line in the engine compartment?

As intended, with the extra fuel filler.

Thank you in advance for the suggestions!
Findus.

Okay, I've dedicated some more time to this.

The brake light switch or the cable connection to the engine control unit seems to be a likely culprit. It has four terminals, two for the brake lights and two for the engine control. The brake actuation signal reaches the brake control unit, but not the engine control unit.

Now I've tried something where you can brake and accelerate at the same time.
Last winter, I was wearing very wide rubber boots, and I accidentally pressed both the gas and brake pedals at the same time. Back then, the gas pedal would automatically return to zero if you pressed the brake pedal while the gas pedal was already being pressed.

Okay, so there's a new brake light switch first, which doesn't cost much. After that, I'll see what else needs to be done.

Thank you very much and have a nice weekend!
Findus.

Problem solved!

After replacing the brake light switch, the problem persisted. Then I checked the connector assembly in the water tank, and I found that a connector had come loose during the installation of the heating cables. This connector was for the circuit between the brake light switch and the EDC (Electronic Stability Control). I reconnected it, and everything is working fine again!

Thank you for the search tips!
Findus.

Thank you for your feedback.