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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 (2.2L) >> Diagnostic Procedure

Diagnostic Procedure

  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. Are any fuel injector DTCs set? If yes, go to DTC P0201-P0204: INJECTOR CONTROL CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L SONOMA & S10 PICKUP 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. Disconnect multi-way harness connector of fuel injectors. Probe Ignition 1 Voltage Supply circuit of fuel injector, fuse side, with test light connected to battery voltage. Does test light illuminate? If yes, go to step  9. If no, go to next step.
  5. Turn ON the ignition, with the engine OFF. Does test light illuminate? If yes, go to step  13. If no, go to step  8.
  6. Turn OFF the ignition. Disconnect multi-way harness connector of fuel injectors. Probe Ignition 1 Voltage Supply circuit of fuel injector, fuse side, with test light connected to a good ground. Crank engine. Does test light illuminate while cranking engine? If yes, go to next step. If no, go to step  10.
  7. Test for continuity between Ignition 1 voltage supply terminal and a fuel injector terminal, at multi-way harness connector, fuel injector side. Does DMM display OL? If yes, go to step  11. If no, go to step  12.
  8. Test Ignition 1 Voltage Supply circuit of fuel injector, between multi-way harness connector and fuel injectors for a short to ground. Did you find and correct the condition? If yes, go to step  14. If no, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - TRUCKS article.
  9. Repair short to ground in Ignition 1 Voltage Supply circuit of fuel injector. After repairs, go to step  14.
  10. Repair open in Ignition 1 Voltage Supply circuit of fuel injector. After repairs, go to step  14.
  11. Repair Ignition 1 Voltage Supply circuit of fuel injectors for an open or high resistance, between multi-way connector and splice. After repairs, go to step  14.
  12. Repair poor connection at multi-way harness connector. After repairs, go to step  14.
  13. Repair short to a PCM ground in Ignition 1 Voltage Supply circuit of fuel injector. After repairs, go to next step.
  14. 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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