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Home >> Oldsmobile >> 2004 >> Bravada AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Control System & Engine Component Tests - 2.2L) >> Fuel Systems >> Fuel Injector Coil Test >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L SONOMA & S10 PICKUP article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Observe Engine Coolant Temperature (ECT) parameter with scan tool. Is ECT value within 50-90°F (10-32°C)? If yes, go to next step. If no, go to step  4.
  3. Disconnect fuel injector multi-way harness connector. Using a DVOM, measure resistance of each fuel injector. Resistance should be 11-14 ohms? If yes, go to FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL  or FUEL INJECTOR BALANCE TEST WITH TECH 2  . If no, go to  6.
  4. Measure resistance of each fuel injector with DVOM. Record each fuel injector resistance value. Subtract the lowest resistance value from the highest resistance value. Is the difference equal to or less than 3 ohms? If yes, FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL  or FUEL INJECTOR BALANCE TEST WITH TECH 2  . If no, go to next step.
  5. Add all fuel injector resistance values, to obtain a total resistance value. Divide total resistance value by number of fuel injectors to obtain an average resistance value. Subtract lowest and highest individual fuel injector resistance values from average resistance value. Replace fuel injector that displays greatest resistance difference, more or less than average. After repairs, go to step  7.
  6. Replace fuel injector(s) that are outside of 11-14 ohms range. After repairs, go to next step.
  7. Operate system in order to verify repair. Did you correct the condition? If yes, system is okay. If no, go to step  2.
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