Passat V6-2.8L (ATQ) (2004)
Test sequence
-
Connect V.A.G 1551 scan tool (VAG 1552). Start engine and select Engine Control Module (ECM) using address word 01 (connecting scan tool
and selecting ECM). See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan Tool
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press 0 and 8 of function "Read Measuring Value Block", and then press Q to exit from input mode.
Indicated on display
Read Measuring Value Block
Input display group number XXX
-
Press 0, 0 and 5 for the function "display group number 5", and then press Q to exit from input mode.
Indicated on display (1 - 4 = display fields)
Read Measuring Value Block 5
->
1
2
3
4
-
Check if control module recognizes operating conditions (display field 4).
-
Idle: (as long as the engine is idling, "idle" should be indicated)
Display: Idle
-
Deceleration mode:
-
Increase engine speed to above 3000 RPM.
-
Then abruptly close throttle valve (as long as engine speed is over 1400 RPM, "Deceleration mode" should be indicated).
Display: Deceleration
NOTE: Below 1400 RPM idle will be recognized again.
-
Partial throttle:
-
Hold gas pedal steady (as long as gas pedal is held steady, "partial throttle" should be indicated).
Display: Partial throttle
-
Enrichment:
-
Open throttle all the way (as far as throttle valve goes).
Acceleration enrichment should be briefly indicated
Display: Enrich
Observe safety precautions which apply to road tests.
-
Press -> button.
-
Press buttons -0- and -6- to select "End data transfer" function 06. Press -Q- button to confirm input.
If expected values are not obtained:
-
Check DTC memory, repair any malfunctions and then erase DTC memory.
-
Test throttle valve control module. See: Electronic Throttle Control Module/Testing and Inspection
Procedure After Interruption of Voltage Supply
Procedure after interruption of voltage supply
If voltage supply has been interrupted, Engine Control Module (ECM) forgets all adaptation and basic setting values and erases the readiness code.
Depending on vehicle's mileage, this can cause substantial problems with running characteristics.