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Home >> Volkswagen >> 1993 >> Passat GL, 2.0 C, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 4-CYL >> Fuel System >> Acceleration Enrichment & Deceleration Fuel Cut-Off
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Acceleration Enrichment & Deceleration Fuel Cut-Off

  1. Ensure engine is cold and A/C system is turned off. Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC) located in center console, in front of shift lever. Start engine and allow it to idle.
  2. With scan tester in READ MEASUREMENT BLOCK function, read coolant temperature value in channel No. 1 of scan tester. Value must be greater than 96, which corresponds to a coolant temperature less than 140°F (60°C).
  3. With scan tester in READ MEASUREMENT BLOCK function, quickly open throttle to wide open position and read acceleration enrichment value in channel No. 9 of scan tester. A display value of 70 must appear briefly.
  4. If this value is not obtained, check idle and full throttle switches. See ADJUSTMENTS - 4-CYL article. If a value of 70 is obtained, allow engine coolant temperature to reach at least 140°F (60°C). Value in channel No. 1 of scan tester must be less than 95.
  5. With scan tester in READ MEASUREMENT BLOCK function, accelerate engine to more than 3000 RPM then allow throttle to close suddenly. Deceleration fuel cut-off value of 133 must appear briefly in channel No. 9 of scan tester.
  6. If a value of 133 is obtained, select END OUTPUT function on scan tester. If a value of 133 is not obtained, check idle and full throttle switches, wiring harness, or replace Electronic Control Module (ECM) as necessary.
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