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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKV-A5 Golf/Jettas

VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR).

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Old March 28th, 2020, 09:07   #1
banshee365
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Join Date: Nov 2012
Location: FL
TDI(s): 06 Jetta
Default Electrical cable voltage drops

Hey all! I'm still fighting this code:

01598 - Drive Battery Voltage
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 2
Fault Frequency: 157
Reset counter: 17
Mileage: 178022 km
Time Indication: 0
Freeze Frame:
ON
Voltage: 13.35 V
ON
ON
OFF
OFF
ON

It jumps the RPM to 1,050 or so and runs the fans. The transmission acts much different when the idle is bumped up as well. It slips the clutches a lot more. I hate it.

I'm trying to track it down. Without testing voltage drops I replaced the alternator with a Bosch reman as it was original with 300k. The issue remains.

I'm getting .18-.20V drop between the alternator stud and battery positive cable. I'm getting .08V of it on the alternator to fuse box cable and .1V of it on the battery positive cable.

Are these drops within spec or is at least one of them to blame for my voltage dropping below limits triggering this annoying code?
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Old March 28th, 2020, 09:27   #2
mr.loops
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Those vdís are within spec. Personally anything > 0.5V raises a red flag

How old is your battery?


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Old March 28th, 2020, 10:22   #3
banshee365
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Quote:
Originally Posted by mr.loops View Post
Those vdís are within spec. Personally anything > 0.5V raises a red flag

How old is your battery?


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It's only a couple years old. Genuine VW battery. The car cranks over great cold.
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Old March 28th, 2020, 10:50   #4
mr.loops
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Quote:
Originally Posted by banshee365 View Post
It's only a couple years old. Genuine VW battery. The car cranks over great cold.

Your freeze frame data shows 13.35 V - thatís with the engine running ... correct? You should be 13.5 - 14.7 V with it running

I would take it to a battery shop and have a tested.


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Old March 28th, 2020, 15:14   #5
Vince Waldon
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The battery is used for starting and that's pretty much it... once the engine is running the alternator is king.

So, that 13.3 represents what the ECU is seeing from the alternator... the battery is just along for the ride and/or some charging...so if there's voltage issues with the car running they are likely on the alternator/charging side of the system.
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Old March 28th, 2020, 15:31   #6
mr.loops
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Quote:
Originally Posted by Vince Waldon View Post
The battery is used for starting and that's pretty much it... once the engine is running the alternator is king.

So, that 13.3 represents what the ECU is seeing from the alternator... the battery is just along for the ride and/or some charging...so if there's voltage issues with the car running they are likely on the alternator/charging side of the system.

Good catch Vince! Sorry I miss wrote in my above post.
I meant to say alternator not battery.


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Old March 28th, 2020, 15:35   #7
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All good mon!
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Old March 28th, 2020, 16:42   #8
banshee365
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Yea, the battery seems fine. I'm getting 13.80V across the charge post and alternator body and 13.30-13.40 across the battery posts.
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Old March 29th, 2020, 05:58   #9
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You need to check the ground side too, with your voltage drop test. I had same problem as you. Main ground cable at the transmission was my issue. From your post, you mentioned testing the positive side but nothing about the negative side.
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Old March 29th, 2020, 20:53   #10
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Quote:
Originally Posted by Maintainer View Post
You need to check the ground side too, with your voltage drop test. I had same problem as you. Main ground cable at the transmission was my issue. From your post, you mentioned testing the positive side but nothing about the negative side.
I checked the main ground and the 3 smaller ones under the air cleaner. They were all super clean for a 300k car.

I may have found the issue. I was getting .40V drop between the alternator post and positive battery post. That is too much to me. I found a large drop on the red positive battery cable between the battery post and fuse box. I wiggled around the cable in different areas and all of a sudden the voltage drop went away and I was getting 13.90V across the battery posts.

I suppose if I get the issue again I will be looking at that cable again.
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Old March 30th, 2020, 22:45   #11
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I hooked leads from meter to alternator hot out, to battery positive post. Set meter in front of windshield started car and started turning electrical loads on, one by one. Meter readings came up a little then stayed stable, well below .5 V. Then switched leads to the case on the alternator to battery negative post, then repeated the same, you could see the voltage add up, each time I turned something on, reading above .5 but not over 1. Had I disabled car from starting, then just cranked the engine over, I'd bet it would have been over the 1 volt easy. I had looked at that ground cable, looked great, of course I had already reinstalled the air cleaner, so I just added another cable from engine block to body ground. That fixed my issue. It made a believer out of me, for not trusting a cable, wire or the terminals by what they look like. Next time I take out the air cleaner, I will cut the insulation off to look at it inside, be cause I'm very interested on what I'll find.
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Old April 7th, 2020, 00:53   #12
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As mentioned previously, I suggest you focus on the voltage being produced by the alternator, it should be around 14.5-14.7V
The voltage drops will be due to the resistance in the cables / terminations which may warrant investigation but i'd definitely start with the alternator.
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Old April 13th, 2020, 21:44   #13
banshee365
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Quote:
Originally Posted by TdiTaff View Post
As mentioned previously, I suggest you focus on the voltage being produced by the alternator, it should be around 14.5-14.7V
The voltage drops will be due to the resistance in the cables / terminations which may warrant investigation but i'd definitely start with the alternator.
The alternator is a new Bosch reman. It puts out 14V or so 100% consistently. The issue is what voltage the battery was seeing.
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