Thread: ALH TDI pinout.
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Old June 30th, 2013, 19:43   #28
AndyBees
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Join Date: May 2003
Location: Southeast Kentucky
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Quote:
Originally Posted by vdubspeed View Post
Awesome. So 37 tells the ECU to come alive. I've been busy parting out another TDI (00 Jetta TDI/5 spd) that my bro needs for a parts car. I'm fortunate to be keeping most of the swap stuff though since he just needs body parts and few other items.

What plug does 121/37 go to?
Well, according to the Bentley for my '02 Jetta donor car, 121/37 goes thru T6/1 (the brown connector) then to an internal "splice" in the wiring harness (the splice is identified as A104). One branch goes to 14a/8 and stops there (thus no use). The other branch goes to Fuse 29 and from there directly to the ignition switch at D15 (Hot when in the ON position). Technically, you could say the current flows to 121/37, thus, making the ECU come alive when the Ignition is turned ON!

Hope that answered your question.
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'84 Vanagon '02 ALH TDI engine Malone Stage 1 tune. CAT, SS 2" exhaust, E-vac system, DMF with upgrade pilot shaft, 4.57 R&P, fan assisted IC. (32 to 35+ MPGs consistently)
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