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04-01-2010, 04:07 AM
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ALH 121 Pin ECU
Does anyone have a link or a list of the uses of each of the 121 pins (circuits) that go to the ALH 121 Pin ECU?
I'm trying to determine the use/purpose of PIN 88. Thanks!
__________________
2000 Jetta TDI (diesel) 50.1 mpg life-time ave 300,000 miles on 12/28/11 
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12-09-2011, 02:00 PM
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ECU 121 pin connector, update
Okay, this Thread is old but has had some views in the last 24 hours.
So, I will answer the question here relating to Pin 88. The circuit begins at the ignition with D75, from there to Splice A80, from there to Fuse 37, from there to the 14-pin connector at T14a/10, from there to the ECU at T121/88. The above applies to the MK4, TDI with the ALH engine. That ciricuit relates to the Load Reduction Relay. The function of the relay is to cut-off non-essential electrical items while the Ignition is in the "start" position! I've deciphered them all!
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