Test sequence

• - Connect VAG 1551 Scan Tool (VAG 1552). Start engine and select "Address word" 01 of engine control module. When doing this engine must be running at idling speed. See VAG 1551 SCAN TOOL (ST), CONNECTING AND SELECTING ENGINE CONTROL MODULE .

Indicated on display

Fig 1: Scan Tool Display - Checking Misfiring Recognition (Rapid Data Transfer)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

• Press keys 0 and 8 for function "Read Measuring Value Block" and confirm entry with Q key.

Indicated on display

Fig 2: Scan Tool Display - Checking Misfiring Recognition (Read Measuring Value Block)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

• Press keys 0, 1 and 4 for "Display group number 14" and confirm entry with Q key.

Indicated on display: (1 to 4 Display zones)

Fig 3: Scan Tool Display - Checking Misfiring Recognition (Read Measuring Value Block 14)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

• Check total number of misfires in display zone 3:

  Specification: 0 to 5

• Check misfire recognition status in display zone 4:

  Specification: activated

If the specifications are obtained:

• Press --> key.
• Press keys 0 and 6 for "End Output" function and confirm input with Q key.
• Switch ignition off.

If the specifications are not attained:

• Check spark plugs and ignition/HT cables. See IGNITION SYSTEM COMPONENTS, REMOVING AND INSTALLING 
• Check ignition coils with power output stages. See IGNITION COIL AND POWER OUTPUT STAGE, CHECKING .
• Check injectors. See FUEL INJECTORS, CHECKING .