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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 140 (Engine Controls - System & Component Testing) >> Fuel System (Gasoline) >> Fuel Injector Coil Test (5.0L & 5.7L) >> Diagnostic Procedure

Diagnostic Procedure

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  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 5.0L & 5.7L CHEVY EXPRESS & SAVANA 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. Remove engine cover. Measure resistance of each fuel injector with DMM. Do any fuel injectors display a resistance outside 11-14 ohms? If yes, go to step  6. If no, go to DIAGNOSTIC AIDS .
  4. Measure and record resistance of each fuel injector with DMM. Subtract lowest resistance value from highest resistance value. Is difference more than 3 ohms? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  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 individual fuel injector resistance value from average resistance value. Subtract highest individual fuel injector resistance value from average resistance value. Replace fuel injector(s) that displays greatest resistance difference from average. After repairs, go to step  7.
  6. Replace fuel injector(s) that are out 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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