The PWM reading fluctuates, which I believe will be the pump working and sending power to the rear.
4Mo - How do you know when it's working?
- Thread starter StratosFearXX
- Start date
Yep - Pulse width modulation to control the amount of power to send to the rear. I would expect the Haldex duty percentage to fluctuate in sync with the PWM percentage.
I'll see if I can record/log some data from the app.
I think I read somewhre that when the Haldex filter starts to clog up the current required increases to compensate, so that could be a good measure to watch over time. Would need to know what is "normal" though.
This what AI says:
A healthy Haldex pre-charge pump typically draws between 2.5 to 5+ Amps when operating correctly, with pressures reaching up to 44 bar, especially during a VCDS/diagnostic "pump learn" cycle. The current is PWM-controlled (Pulse Width Modulation), and values below this range often indicate a blocked filter or failed pump motor, while very low current suggests a faulty unit.
Key Haldex Pump Current Characteristics:
This what AI says:
A healthy Haldex pre-charge pump typically draws between 2.5 to 5+ Amps when operating correctly, with pressures reaching up to 44 bar, especially during a VCDS/diagnostic "pump learn" cycle. The current is PWM-controlled (Pulse Width Modulation), and values below this range often indicate a blocked filter or failed pump motor, while very low current suggests a faulty unit.
Key Haldex Pump Current Characteristics:
- Normal Operating Range: Approx. 2.5–3.5 Amps during active driving, according to Freel2.com.
- Pump Learn Cycle: Current may increase and fluctuate up to ~3.1 Amps to achieve 44 bar pressure, as seen in this YouTube video.
- Fault Detection: High resistance (>10-20+ ohms) or excessive current draw (>8-10 amps) usually indicates a faulty pump or burnt-out motor, according to T6Forum.com and Haldex Repairs.
I think that was a quick get away on a busy roundabout haha
I don't recall there being a temerature sensor on the haldex ( I had haldex 4WD on my Q3) so probably some random value.
I am "pretending" I have 4WD on my van but wishing I did...
There are actually three temperature sensors (T6 and T6.1). See the blockmap files in 4motion error c1113 07
Hmm, can't find those on mine ... DNAA 4Mo, Android phone.
What vehicle have you set in the connection profile?
I had set mine to transporter, in the drop down list, and assume if you have set it to something that doesn't come with a 4WD option it won't show up.
Thanks I'll have another go tomorrow. No idea what I've set!
Yer, still can't find it, can't find DNAA anywhere it the list ...
I do get this but can't find Haldex in the list of sensors:
You mean I should try that? Mines 'definitely' a DNAA. Well I'm pretty sure it is ...
So DMZA isn't on the list either but I picked this one and now have Haldex showing up.
)
The MQB EVO platform is for the later model Golfs, Tiquan and I think maybe the T7, so would include the 4WD options, but you may find other transporter related items missing or incorrect, but might also be a good option for the T6 as well.
I scrolled to near the bottom of the list and found a "transporter" option, which I used.
I scrolled to near the bottom of the list and found a "transporter" option, which I used.
Thanks, yeah the Transporter option didn't show the Haldex for me.