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Paulbeard
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Joined: July 10, 2015
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Location: Seattle
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 Posted: Sun Sep 23, 2018 1:41 pm Post subject: pinout/wiring help for inline 4 (Jetta) temp sender |
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I have a temp sender and gauge I would like to install but i have no idea how wire(s) from the sender go to the gauge. As you can see, they are numbered 1-4.
Is there some way I can use a meter and hot water to see what's happening? Like drop the sender in hot water and meter the pigtail to see what it is sending?
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Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs
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crazyvwvanman
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Joined: January 28, 2008
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Location: Orbiting San Diego
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| Posted: Sun Sep 23, 2018 1:44 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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Use an Ohm meter and measure between the 2 green wires, write it down.
Then measure between the 2 purple wires, write it down.
Do it at room temperature.
What did you get?
Mark |
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Paulbeard
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Joined: July 10, 2015
Posts: 2604
Location: Seattle
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| Posted: Sun Sep 23, 2018 1:48 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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| crazyvwvanman wrote: |
Use an Ohm meter and measure between the 2 green wires, write it down.
Then measure between the 2 purple wires, write it down.
Do it at room temperature.
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On what scale? Resistance?
Green: 1200
Purple: 717
_________________
Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs
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crazyvwvanman
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Joined: January 28, 2008
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Location: Orbiting San Diego
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| Posted: Sun Sep 23, 2018 1:53 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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By those numbers the green wires would be for the Temp2 to fuel injection and the purple wires would be for the temp gauge.
Was the sender stone cold or had you tried heating it already?
Mark |
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Paulbeard
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Joined: July 10, 2015
Posts: 2604
Location: Seattle
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| Posted: Sun Sep 23, 2018 1:55 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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| crazyvwvanman wrote: |
By those numbers the green wires would be for the Temp2 to fuel injection and the purple wires would be for the temp gauge.
I would have expected the green reading to be slightly more than that. Was the sender stone cold or had you tried heating it already?
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You got me. I had tried heating it. I'll let it sit. You think the purple pair is the one? If I let it sit, meter, then heat again, i should see different values?
_________________
Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs
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Vanagon Nut
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Joined: February 08, 2008
Posts: 10379
Location: Sunshine Coast B.C.
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| Posted: Sun Sep 23, 2018 2:02 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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What engine is that from or for?
Neil.
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1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
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Paulbeard
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Joined: July 10, 2015
Posts: 2604
Location: Seattle
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| Posted: Sun Sep 23, 2018 2:04 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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| Vanagon Nut wrote: |
What engine is that from or for?
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MkIII Jetta in my van…I have the stock idiot lights for temp but I feel the need more information. Boilovers are no fun, especially 100 miles from cell service/AAA.
_________________
Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs
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Vanagon Nut
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Joined: February 08, 2008
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Location: Sunshine Coast B.C.
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| Posted: Sun Sep 23, 2018 2:18 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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| Paulbeard wrote: |
| Vanagon Nut wrote: |
What engine is that from or for?
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MkIII Jetta in my van…I have the stock idiot lights for temp but I feel the need more information. Boilovers are no fun, especially 100 miles from cell service/AAA. |
Ok thanks. Had a quick look in my A3 Bentley but didn't see that wire colour combo/pin out.
Are those replacement (repair) wires?
_________________
1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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Paulbeard
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Joined: July 10, 2015
Posts: 2604
Location: Seattle
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| Posted: Sun Sep 23, 2018 2:19 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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| Vanagon Nut wrote: |
| Paulbeard wrote: |
| Vanagon Nut wrote: |
What engine is that from or for?
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MkIII Jetta in my van…I have the stock idiot lights for temp but I feel the need more information. Boilovers are no fun, especially 100 miles from cell service/AAA. |
Ok thanks. Had a quick look in my A3 Bentley but didn't see that wire colour combo/pin out.
Are those replacement (repair) wires? |
It's a whole new sender and pigtail/connector.
Now that Mark has ID'ed the wires, what connects to the signal wire? The gauge has a signal terminal for one spade connector.
_________________
Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs
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Vanagon Nut
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Joined: February 08, 2008
Posts: 10379
Location: Sunshine Coast B.C.
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| Posted: Sun Sep 23, 2018 2:42 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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| Paulbeard wrote: |
| Vanagon Nut wrote: |
Are those replacement (repair) wires? |
It's a whole new sender and pigtail/connector.
Now that Mark has ID'ed the wires, what connects to the signal wire? The gauge has a signal terminal for one spade connector. |
ok. Maybe something like this?
https://www.aliexpress.com/item/CITALL-New-4-Pin-C...66553.html
I thought all ABA's had the same pin out but for the Cabrio ABA's I see:
of 3/4, 3 is to ECU 53
of 1/2, 1 is to gauge
the other two are to ground.
Neil.
_________________
1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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Paulbeard
Samba Member
Joined: July 10, 2015
Posts: 2604
Location: Seattle
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| Posted: Sun Sep 23, 2018 3:11 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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That's what I was looking for. Now for the business of running the wire from here to there.
_________________
Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs
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Vanagon Nut
Samba Member
Joined: February 08, 2008
Posts: 10379
Location: Sunshine Coast B.C.
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| Posted: Sun Sep 23, 2018 3:38 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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Marks method sure made sense and is worth remembering.
Out of curiosity, is the wiring harness in question from a Cabrio?
This is hair splitting but the A3 Bentley diagrams show somewhat specific points where the various wiring harness grounds connect. How crucial ground wire length, location is, I don't really know. Anyhow....
The Golf/Jetta ABA ECU temp sensor (Temp2) ground connects via a wire in the engine harness to the engine block. For the Cabrio, Bentley pages 97-442 and 97-508 show the ECU temp sensor ground (G62) connecting to 220 'engine compartment wiring harness' so I bet it has the same ground route and connection (edit) as the Golf/Jetta ABA. To my mind, the quality of ground for the ECU temp sensor is more important than the ground for the temp gauge sensor.
I don't know if this is intended to somehow ground the ignition coil body or if it's used to supply ground from the vehicle body to the engine but on the Mk3 donor i got my wiring harnesses from, there was a ~ 1/2" wide ground strap between a securing bolt at ignition coil and engine. I believe that strap is OE.
Neil.
_________________
1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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Paulbeard
Samba Member
Joined: July 10, 2015
Posts: 2604
Location: Seattle
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| Posted: Sun Sep 23, 2018 3:43 pm Post subject: Re: pinout/wiring help for inline 4 (Jetta) temp sender |
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| Vanagon Nut wrote: |
Marks method sure made sense and is worth remembering.
Out of curiosity, is the wiring harness in question from a Cabrio?
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No, it's from China… /rimshot
Mark has forgotten more than I will ever know about this stuff. I never would have guessed it was that easy to figure out.
This sensor plugs into a housing where the coolant returns from the pressure tank: there are two sockets, one for the existing idiot light sensor and an empty one I'll use for this.
| Vanagon Nut wrote: |
This is hair splitting but the A3 Bentley diagrams show somewhat specific points where the various wiring harness grounds connect. How crucial ground wire length, location is, I don't really know. Anyhow....
The Golf/Jetta ABA ECU temp sensor (Temp2) ground connects via a wire in the engine harness to the engine block. For the Cabrio, Bentley pages 97-442 and 97-508 show the ECU temp sensor ground (G62) connecting to 220 'engine compartment wiring harness' so I bet it has the same ground route and connection. To my mind, the quality of ground for the ECU temp sensor is more important than the ground for the temp gauge sensor.
I don't know if this is intended to somehow ground the ignition coil body or if it's used to supply ground from the vehicle body to the engine but on the Mk3 donor i got my wiring harnesses from, there was a ~ 1/2" wide ground strap between a securing bolt at ignition coil and engine. I believe that strap is OE.
Neil. |
_________________
Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs
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