| The control unit needs the signal from the air mass meter to calculate the admissible injection flow and to regulate exhaust recirculation. The lower the signal from the air mass meter, the lower the quantity of fuel injected. |
| Special tools and workshop equipment required |
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| Fault reader -V.A.G. 1551- or vehicle systems tester -V.A.G. 1552- with lead -V.A.G. 1551/3B- |
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| Test box -V.A.G. 1598/31- |
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| Hand-held multimeter -V.A.G. 1526- or multimeter -V.A.G. 1715- |
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| Auxiliary measurement set -V.A.G. 1594 A- or -V.A.G. 1594 C- |
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