Test sequence

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Connect VAG1551 /1552 (Connecting scan tool and selecting engine electronics control module → Scan Tool VAG1551 , connecting .)

Indicated on display:

Rapid data transfer HELP
Select function XX

Press buttons 0 and 8 for the function "Read measured value block" and confirm entry with Q button.

Indicated on display:

Read measured value block
Enter display group number XXX

Press buttons 0 , 1 and 0 for "Display group number 10" and confirm entry with Q button.

Read measured value block 10 →
0 mg/H 1027 mbar 1013 mbar 0.0 %

Compare display in field 2 (BARO Sensor F96 ) with display in field 3 (MAP Sensor G71 ) and display on turbocharger test unit VAG1397/A with one another.

Specification: The pressures must be the same

(tolerance ± 30 mbar)

NOTE:

The turbocharger test unit is required to provide an independent figure for comparison. The turbocharger test unit must be set to measuring range I (absolute pressure). A barometer can be used instead.

If value in display field 2 deviates:

Press the → button.
Press buttons 0 and 6 for the function "End output" and confirm entry with the Q button.
Switch off ignition.
Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing .

Value in display field 3 deviates:

Press the → button.
Press buttons 0 and 6 for the function "End output" and confirm entry with the Q button.
Switch ignition off.
Remove wiper arms and plenum cover: → 92 WINDSHIELD WIPER & WASHER SYSTEM

Fig 1: Identifying Test Box V.A.G 1598/31 Connected To Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect test box VAG1598/31 to control unit wiring harness.
Remove the right headlight: → 94 LIGHTS, SWITCHES - EXTERIOR
Pull the 4-pin connector off intake manifold pressure sensor G71 with intake manifold temperature sensor G72 - arrow -. Fitting location overview.

Fig 2: Identifying Connector Terminals 1 And 4

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check wiring between test box and connector for open circuit using wiring diagram.

Terminal 3+ socket 31

Terminal 4+ socket 71

Wire resistance: max. 1.5 Ω

Check wires for short to one another, to vehicle Ground and to battery positive (B+).

Specification: ∞Ω

If no fault is detected in the wiring:

If wiring and the resistance measurement values are OK, replace Diesel Direct Fuel Injection Engine Control Module J248 → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing .