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Home >> Volkswagen >> 1993 >> EuroVan CL, 2.5 C, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Injectors & Circuit >> EuroVan (2.5L)
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EuroVan (2.5L)

  1. Ensure Hall Effect sensor and its circuit is okay. Disconnect fuel injector wiring harness. Using test leads from Adapter Kit (VW 1594), connect LED Tester (US 1115) to fuel injector wiring harness connector terminals No. 1 and 6. See Fig 1 .
    NOTE: Connect LED tester to terminals No. 1 and 2 on models with 2-pin connector.
  2. Crank engine and observe LED tester. LED tester must light up. Repeat injector circuit test using terminals No. 2 and 6, No. 3 and 6, No. 4 and 6, and terminals No. 5 and 6 (skip this test on 2-pin connector).
  3. If LED lights up continuously, repair ground wire between battery and transmission or replace ECM as necessary. If LED flickers but DOES NOT light up, test fuel injector voltage supply circuit(s) using PIN VOLTAGE CHARTS article or replace ECM as necessary.
  4. On models with 2-pin connector, connect Digital Volt-Ohmmeter (DVOM) between fuel injector wiring harness connector terminals No. 1 and 2. Injector resistance should be 3.0-4.0 ohms. If resistance is incorrect, remove fuel rail and test individual injectors (12.0-18.0 ohms).
  5. On models with 6-pin connector, check individual fuel injector resistance between terminals No. 1 and 6, No. 2 and 6, No. 3 and 6, No. 4 and 6, and terminals No. 5 and 6. See Fig 1 . Individual injector resistance must be 12.0-18.0 ohms.
  6. On all models, disconnect cold-start injector and Engine Coolant Temperature (ECT) sensor. Adjust Digital Potentiometer (VAG 1630) to 15000 ohms and connect potentiometer to ECT sensor using test leads from Adapter Kit (VW 1594).
  7. Remove fuel rail, leaving fuel lines and injectors attached. Use test leads and fuel rail hose extensions if necessary. Place injectors in Fuel Analyzer (VAG 1602). Crank engine and observe injectors.
  8. Injectors must spray uniformly while pulsating. Turn ignition off and disconnect fuel rail wiring harness. Turn ignition on for 5 seconds and check fuel injectors for leaks. No more than 2 drops are permissible per minute. When reinstalling fuel rail, ensure "O" rings are not damaged.
Fig 1: Testing Fuel Injectors & Circuit (EuroVan)
G93D81110Courtesy of VOLKSWAGEN UNITED STATES, INC.
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