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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old May 15th, 2012, 10:07   #16
DanG144
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Join Date: Aug 2007
Location: Chapin, South Carolina, USA
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I would look at voltage and power issues.
Those codes mean that the current flow through each glow plug is not what the ECU expects it to be.
This can come from bad grounds, bad voltage control on the alternator, rapidly changing starter current loads.
Clean the grounds under the battery (probably 3), clean the battery connections.
Clean the major ground from the chassis to the engine.
Clean the ground near the ECU.
Inspect the large power fuse holder for good connection.

Your starter must reliably turn the engine over at more than 200 rpm without dragging the system voltages too low for the ECU to work. Certainly it should not drop battery voltage lower than 9.5 volts.

I have seen these codes from bad grounds, bad starter, huge drag on the starter from alternator bearings going out (found this by starting without the accessor belt in place), or simply a bad voltage regulator on the alternator.
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