Jetta V6-2.8L (AFP) (1999)
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Press the keys "0", "6" and "2" for "display group number 62" and acknowledge the entry by pressing "Q".
Indicated on display (1 - 4 display fields)
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Check the specification of sensor 1 (G79) from the message in field 3, while engine is idling. Specification: 12-97 %
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Check the specification of sensor 2 (G 185) infield 4, while the engine is idling. Specification: 4-49%
Note: The engine control unit converts the voltage of the angle transmitter in percent, based on 5 volts, and displays it (5 volts represents 100 %).
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Slowly actuate the accelerator until full throttle and simultaneously observe the percentages displayed in fields 3 and 4:
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The percentage in field 3 should increase steadily. Here, the range of tolerances 12-97 % is not totally utilized.
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The percentage in field 4 should increase steadily. Here, the range of tolerances 4-49 % is not totally utilized.
Note: The value displayed in field 3 should always be about twice as large as the value in field 4.
If the displays do not behave as described:
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Check the power supply and the electrical connections of the throttle position sensors Refer to Powertrain Management.
Checking the power supply and cables to the control unit
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Remove the driver side shelf: Refer to Body and Frame.
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Disconnect the 6 pin connector for the throttle position sensor.
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Turn on the ignition.
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To measure the voltage, connect the multimeter to the following contacts of the connector:
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Contact 1 + ground
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Contact 1 + 5
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Contact 2 + ground
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Contact 2 + 3
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Specification: at least 4.5 V
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Turn off the ignition.
If the specifications are not achieved:
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Connect the V.A.G 1598/31 test box to the control unit wiring. Do not connect the engine control unit.