Jetta SportWagen L5-2.5L (CBUA) (2009)
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Using a multimeter, connect the positive lead to the MAF / IAT sensor (G70 / G42) harness connector terminal 1 and the negative lead to an
engine ground.
Specified value: 4.30 V to 4.90 V
If the specification was not obtained:
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Check the wiring for an open, high resistance or short to ground.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring or connection.
If voltage was not present and no malfunction is detected in the signal circuit:
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Replace the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
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If voltage was in specification:
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Using a multimeter, connect the positive lead to Battery + and the negative lead to the MAF / IAT sensor (G70 / G42) harness connector terminal
3.
Specified value: Battery voltage.
If the specification was not obtained:
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Check the ground circuit for an open or high resistance.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wire or connection.
If voltage was in specification:
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Replace the MAF / IAT sensor (G70 / G42)
°Testing if display is - 40 C :
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Disconnect the MAF / IAT sensor (G70 / G42) electrical harness connector - arrow -.