A4 Sedan L4-1.8L Turbo (AEB) (1997)
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Check air pressure with turbocharger tester VAG 1597/A (actual pressure indication) and compare with displayed value.
If the displayed value is so high or low that it seems implausible for the altitude or the air pressure:
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Check wiring and terminals for excessive resistance.
If displayed value is NOT OK:
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Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Monitors, Trips and/or Drive Cycle/Displaying Readiness Code" See: Powertrain Management/Computers and Control Systems/Testing
and Inspection
Refer to "Monitors, Trips and/or Drive Cycle/Generating Readiness Code" See: Powertrain Management/Computers and Control Systems/Testing
and Inspection
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Press -> button to advance program sequence.
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Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
Checking wiring
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Disconnect harness connector from Barometric Pressure (BARO) sensor.
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Switch ignition on.
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Connect multimeter US 1119 (Fluke 83 or equivalent) and check voltage between connector terminals 1 and 3 (Ground) as well as 2 and 3
(Ground), using adapter cables from VW 1594 connector test kit.
Specified value for both: 4.5 - 5.5 volts
If voltage is NOT OK:
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Switch ignition off.
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Connect VAG 1598/22 test box to ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting
VAG 1598/22 Test Box" See: Powertrain Management/Computers and Control Systems/Testing and Inspection
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Check wiring for open circuit between ECM/test box and 3-pin harness connector, according to wiring diagram.
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Connector terminal 1 to ECM/test box socket 61