Volkswagen Workshop Service and Repair Manuals

Note:

Check establishes whether Simos control unit (J361) recognises the engine operating modes.

Special tools, testers and auxiliary items

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3

Test conditions

• ● Coolant temperature at least 80 °C

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit with the "Address word" 01. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine electronics control unit .)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0 and 4 for "Display group number 04" and confirm entry with Q key.

Display for operating modes:

• ◆ Overrun mode:

• ‒ Increase engine speed to above 3000 rpm.
• ‒ Close throttle abruptly.

• 1st position from left must display 1 as long as the engine speed is above 1500 rpm
       Display: 10000000

• ◆ Idling:

• 2nd position from left must display 1
       Display: 01000000

• ◆ Part throttle:

• ‒ Rev up evenly.

• 3rd position from left must display 1
       Display:: 00100000

• ◆ Full throttle:

• ‒ Floor accelerator pedal and release.

• 4th position from left must briefly display 1
       Display: 00010000

Note:

Below 1500 rpm idling speed is again recognised.

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.

If the specifications are not attained:

• ‒ Interrogate and erase fault memory, eliminate faults if necessary => Page 01-9 .
• ‒ Check accelerator mechanism for ease of operation.
• ‒ Check throttle valve potentiometer
  => Page 24-57 , checking throttle valve control part.