Test sequence

NOTE: Test and measuring equipment must be secured to rear seat and operated by a 2nd person.

WARNING: If test and measuring equipment is operated from the front seat and vehicle is involved in an accident, there is a possibility the person may be injured when the airbag is deployed. Secure Scan Tool (ST) to rear seat.

Connect Scan Tool V.A.G 1551/1552. See VAG 1551 SCAN TOOL, CONNECTING .
Start engine and let idle
Press -0- and -1- to select Address word 01:
"Engine electronics"

Indicated on display:

Fig 1: Scan Tool Display - Checking Additional Signals (1 Of 3)

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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

Indicated on display:

Fig 2: Scan Tool Display - Checking Additional Signals (2 Of 3)

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Press buttons -0-, -0- and -6- for "Display group number 6" and confirm with -Q- button.
Test drive with 2nd person to observe display.
Observe safety precautions when driving road test, see SAFETY PRECAUTIONS .
Observe figure in display field 1.

Fig 3: Scan Tool Display - Checking Additional Signals (3 Of 3)
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Specification: approx. road speed
Press --> button.
Press buttons -0- and -6- for "End output" and confirm with -Q- button.
Switch off ignition.

If no speed is indicated:

Remove wiper arms and cowl panel
See Plenum Cover Removal & Installation
Connect VAG 1598/22 (through my 1999) or VAG 1598/31 (from my 2000) test box to Engine Control Module (ECM) -J248- wiring harness.

Fig 4: Connecting Vag 1598/22 Or Vag 1598/31 Test Box To Engine Control Module (ECM) -J248- Wiring Harness

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Connect electrical tester between following sockets:
- Through MY 1999: 1 (ground) and socket 51 (speed signal)
- From MY 2000: 4 (ground) and socket 20 (speed signal)
Lift vehicle at front left.
Switch on ignition.
Rotate front wheel and observe LED in electrical tester.
LED must flash

(approx. four times per wheel rotation).

NOTE: If necessary, hold front right wheel to prevent it from turning.
If diode test lamp does not flash, check wiring from following terminal of Engine Control Module (ECM) -J248- connector, to instrument cluster for open/short circuit:
- Through MY 1999: 51
- From MY 2000: 20
Check DTC memory, if necessary, repair any malfunctions and erase DTC memory. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING
Display readiness code, see READINESS CODE, DISPLAYING .

If DTC memory has been erased or Engine Control Module (ECM) -J248- was disconnected:

Readiness code must be reset, See READINESS CODE, SETTING .