MAP and BARO Sensors, Checking

Both Manifold Absolute Pressure Sensor and Barometric Sensors are located inside the Diesel Direct Fuel Injection (DFI) Engine Control Module.

Special tools, testers and auxiliary items:

-VAG1551 or VAG1552 Scan Tool (ST)
-VAG1551/3 adaptor cable
-VAG1397/A turbocharger tester

Test Sequence:

Connect VAG1551 or VAG1552 scan tool
Switch ignition ON (but do not start engine)
Press -0- and -1- buttons to insert "Engine Electronics" address word 01
Display will appear as shown:

Rapid data transfer HELP
select function XX

Press -0- and -8- buttons to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input
Display will appear as shown:

Read measuring value block HELP
Input display group number XXX

Press -0-, -1- and -0- buttons to select display group No. 10 (010)
Press -Q- button to confirm input
Display will appear as shown:

Read measuring value block 10 ->
0 mg/H 1027 mbar 1013 mbar 0.0%

Compare values in display field 2 (BARO sensor -F96-) with 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 VAG1397/A 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 -0- and -6- buttons to select "End Output" function 06, and press -Q- button to confirm input
-Switch OFF ignition
-Replace Diesel DFI ECM -J248-
-Display the readiness code

If DTC memory was erased:
-Create readiness code again