Golf L4-1896cc 1.9L DSL Turbo (1Z) (1997)
Manifold Pressure/Vacuum Sensor: Testing and Inspection
Both Manifold Absolute Pressure Sensor and Barometric Sensors are located inside the Diesel TDI Engine Control Module.
Special Tools, Testers And Auxiliary Items:
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VAG 1551/1552 Scan Tool with VAG 1551/3 adaptor cable
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VAG 1397/A turbocharger test unit
Test Sequence:
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Connect VAG 1551/1552 Scan Tool
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Switch ON ignition (but do not start engine)
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Press 0 and 1 buttons to select address word 01 "engine electronics"
Display will appear as shown:
Rapid data transfer HELP
select function XX
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Press 0 and 8 buttons to select Function 08 "Read measuring value block"
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Press Q button to enter input
Display will appear as shown:
Read measuring value block HELP
Input display group number XXX
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Press 0, 1 and 0 buttons to select display group number 10
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Press Q button to enter input
Display will appear as shown:
Read measuring value block 10 ->
0 mg/H 1027 mbar 1013 mbar 0.0%
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Compare display zone 2 (BARO sensor F96) with display zone 3 (Manifold Absolute Pressure sensor G71)
Specification: pressures must be the same ± 30 mbar
If specification not obtained:
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Compare pressure display with VAG 1397/A
Tolerance ± 30 mbar
If value in display zone 3 deviates:
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Disconnect pressure hose from ECM
If value in display zone 3 still deviates:
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Press -> button
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Press 0 and 6 buttons to select Function 06 "end data transfer"
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Press Q button to enter input
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Switch OFF ignition
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Replace ECM J248
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Display the readiness code
If DTC memory was erased:
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Create readiness code again