Test sequence
WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Connect VAG1551 or VAG1552 scan tool, see VAG1551 SCAN TOOL (ST), CONNECTING .
- Switch ignition on (but do not start engine).
- Press buttons -0- and -1- to insert "Engine Electronics" address word 01.
Indicated on display
Fig 1: Scan Tool Display - Checking Manifold Absolute Pressure (MAP) And Barometric Pressure (BARO) Sensors (1 Of 3)
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Fig 2: Scan Tool Display - Checking Manifold Absolute Pressure (MAP) And Barometric Pressure (BARO) Sensors (2 Of 3)
- Press buttons -0-, -1- and -0- to select display group no. 10 (010).
- Press -Q- button to confirm input.
- Compare values in display field 2 (BARO sensor -F96-) and display field 3 (MAP sensor -G71-).
Specification: pressures equal (+ 30 mbar)
If pressures are not equal (as specified):
- Compare scan tool values with pressure measured using VAG1397A turbocharger tester.
Specification: pressures equal (= 30 mbar)
If value in display field 3 deviates:
- Disconnect pressure hose from Diesel DFI ECM.
If value in display field 3 still deviates:
- Press --> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Switch ignition off.
- Replace Diesel DFI ECM -J248-, see item 3 .
- Display readiness code, see READINESS CODE, DISPLAYING .
If DTC memory was erased:
- Create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .