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Home >> Cadillac >> 2002 >> Escalade EXT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Gasoline) >> Fuel Injector Circuit Diagnosis (4.3L) >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP , SELF-DIAGNOSTICS - 4.3L CHEVY EXPRESS & SAVANA or SELF-DIAGNOSTICS - 4.3L SIERRA & SILVERADO article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Is DTC P0200 set? If yes, go to DTC P0200: FUEL INJECTOR CONTROL CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 4.3L ASTRO, BLAZER, JIMMY CANADIAN, SAFARI, SONOMA & S10 PICKUP , SELF-DIAGNOSTICS - 4.3L CHEVY EXPRESS & SAVANA or SELF-DIAGNOSTICS - 4.3L SIERRA & SILVERADO article. If no, go to next step.
  3. Inspect ECM 1 fuse. Is ECM 1 fuse open? If yes, go to next step. If no, go to step  6.
  4. Turn OFF the ignition. Remove engine cover. Disconnect harness connector of fuel injectors. Probe Ignition 1 Voltage Supply circuit of a fuel injector, fuse side, with test light connected to battery voltage. Does test light illuminate? If yes, go to step  8. If no, go to next step.
  5. Turn ON the ignition, with the engine OFF. Does test light illuminate? If yes, go to step  11. If no, go to DIAGNOSTIC AIDS .
  6. Turn OFF the ignition. Remove engine cover. Disconnect harness connector of fuel injectors. Turn ON the ignition, with the engine OFF. Probe Ignition 1 Voltage Supply circuit of fuel injector, fuse side, with test light connected to a good ground. Does test light illuminate? If yes, go to next step. If no, go to step  9.
  7. Test for continuity between ECM 1 fuse and Ignition 1 voltage supply terminal of a fuel injector. Does DMM display a resistance more than 5 ohms? If yes, go to step  10. If no, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - TRUCKS article.
  8. Test Ignition 1 Voltage Supply circuit of fuel injectors for a short to ground. After repairs, go to step  12.
  9. Repair open in Ignition 1 Voltage Supply circuit of fuel injectors. After repairs, go to step  12.
  10. Repair high resistance in Ignition 1 Voltage Supply circuit of fuel injectors. After repairs, go to step  12.
  11. Repair short to a PCM ground in Ignition 1 Voltage Supply circuit of fuel injectors. After repairs, go to next step.
  12. Operate system in order to verify repair. Did you correct the condition? If yes, system is okay. If no, go to step  3.
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