Rabbit L5-2.5L (BGQ) (2008)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow Sensor, Checking
Special tools, testers and auxiliary items required
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Multimeter.
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wiring diagram
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor G70.
Test requirements
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Fuse for Mass Air Flow (MAF) Sensor G70 OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Coolant Temperature at least 80 degrees C.
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Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. See: Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
Function test
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Connect the scan tool.
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Start engine and let it run at idle.
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Select "Diagnostic mode 1: Check measured values".
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Select measuring value "PID 16: Air stream amount at Mass Air Flow (MAF) sensor".
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Check specified value of air flow quantity at Mass Air Flow (MAF) Sensor G70 at idle:
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End diagnosis and switch ignition off.
If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) Sensor G70:
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Check voltage supply of Mass Air Flow (MAF) Sensor G70.
If specified value is not obtained:
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check sensor internal resistance:
Mass Air Flow
Measured Value
Sensor G70 electrical harness
connector terminal
1 to 3
2k ohms
1 to 4
6k ohms
1 to 5
297k ohms
3 to 4
4.5k ohms
3 to 5
297k ohms
4 to 5
900k ohms
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values obtained, continue diagnosis
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Values not obtained, replace sensor G70.
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Check wiring of Mass Air Flow (MAF) Sensor G70.
Checking voltage supply