New Beetle Convertible L5-2.5L (BPR) (2007)
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Check the ground circuit for an open or high resistance.
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Check the harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wire or connection.
If the specified value was obtained:
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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.
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Using a jumper wire, connect the MAF / IAT sensor (G70 / G42) harness connector terminals 1 to 2.
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Check the value indicated on the scan tool display.
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Switch ignition OFF.
If indication jumps to approx. 140 °C:
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Replace the MAF / IAT sensor (G70 / G42).
If indication remains at approx. -40 °C or -46 °C:
Checking wiring
If the manufacturers test box is being used, perform the following step.
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Install the test box.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J220). Refer to the Repair Information.
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Using a multimeter, check the MAF / IAT sensor ( G70 / G42) harness connector terminal 2 to the Motronic Engine Control Module (ECM)
(J220) electrical harness connector T121 terminal 42 for an open circuit or a short to voltage, refer to the wiring diagram.
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Using a multimeter, check the MAF / IAT sensor ( G70 / G42) harness connector terminal 1 to the Motronic Engine Control Module (ECM)
(J220) electrical harness connector T121 terminal 13 for an open, high resistance or a short to voltage, refer to the wiring diagram.
Specified resistance: 1.5 ohms Max.
If the specified value was Not obtained:
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Check the wiring for an open, high resistance or short circuit to Battery (+).
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Check the harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
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Replace the Motronic Engine Control Module (ECM) (J220). Refer to the Repair Information.
°Testing if display near 140 C:
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Disconnect the MAF / IAT sensor (G70 / G42) electrical harness connector.
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Using the scan tool, check the intake air temperature:
If indication jumps to approx. -40° C to -46° C:
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Switch ignition OFF.