Checking engine operating condition: VW 1.6 (AYD, BFS)

BFS
Note:

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

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

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

Test prerequisites

Coolant temperature must be at least 80 °C, =>display group 04, display zone 3.

Test sequence

Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit.
(Connecting fault reader and selecting engine control unit => page
01-11
).

Rapid data transfer
HELP
Select function XX
Indicated on display:

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

Read measured value (data) block
Input display group number XXX
Indicated on display:

Press keys 0, 5 and 4 for "Display group number 54" and confirm entry with Q key.

Read measured value block 54
⇒
1
2
3
4
Indicated on display:
(1...4 = display zones)

Check whether the control unit recognises the operating conditions (display zone 2):

Idling:

Idling must be displayed as long as the engine is running at idling speed
Display: Idling

Overrun mode:

Increase engine speed to above 3000 rpm.
Quickly release accelerator pedal.

As long as the engine speed is above 1400 rpm overrun must be displayed
Display: Overrun

Note:

Below 1400 rpm idling speed will be recognised.

Part throttle:

Rev up evenly.

As long as the engine is being revved up evenly, part throttle must be displayed
Display: Part throt.

Enrichment and full throttle:

Depress accelerator pedal completely (throttle burst)

Enrichment and then full throttle should be displayed briefly
Display: Enrich. and then full throttle

Note:

A test drive may have to be performed to show "Full load" in display.

Observe the valid safety precautions when carrying out a road test => page
24-27
.

Press the ⇒key.

Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.

If the specifications are not attained:

Interrogate fault memory, repair faults if necessary and then erase fault memory => page
01-21
, Interrogating and erasing fault memory.
Check throttle valve control part
=>page
24-52
.