Acceleration/Full Throttle Enrichment & Decel Fuel Cutoff

Acceleration/Full Throttle Enrichment and Deceleration Fuel Cutoff, Checking

NOTE: Use the following procedure to check the deceleration fuel cutoff. If this check and the check for the air flow sensor potentiometer are OK, acceleration and full throttle enrichment are also OK.

- connect VAG 1551 Diagnostic tester
- start engine and let idle
- select Function 08 "Read measuring block value"
or:
- while observing VAG 1551 display, select the following functions in sequence
1 - Rapid data transfer
01 - Engine electronics
08 - Read measuring block value

- press 0 and 1 key to select display group number 00
- display will appear as shown





- press 0 key to enter input
- display will appear as shown





Continue with checking only if:
- the coolant temperature displayed in channel 3 is 80°C (176°F) minimum

- while observing channel 1 displayed value, raise engine speed in excess of 3000 RPM three times
- let engine idle for 2 minutes
- observe displayed value in channel 4
- raise engine speed to a minimum of 3000 RPM by stepping on accelerator pedal then releasing
- the value displayed in channel 4 must increase in value; drop to 0 ms; then return to the previously observed value

If YES
- acceleration/full throttle enrichment and deceleration fuel shutoff OK

If displayed value does not increase and does not return to 0 ms
- check throttle potentiometer, Testing and Inspection