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Test TC-107A - Cylinder No. 1-6 Misfire (V6)

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS - 3.5L article.
  1. Repair any other Diagnostic Trouble Codes (DTCs) before proceeding with this test. Only diagnose cylinder that has the DTC associated with it. MULTIPLE CYLINDER MISFIRE DTC sets when a more than 2 percent misfire rate is measured during 2 trips or with a 10-12 percent misfire rate during one trip. Possible causes are: ignition coil circuit failure, failed spark plug or wire, malfunctioning fuel pump or restricted fuel filter, mechanical engine failure, EGR malfunction, injector malfunction or failed Powertrain Control Module (PCM). Go to next step.
  2. Turn ignition off. Connect an engine analyzer to vehicle. Start engine and let it idle. If engine will not idle, maintain a constant engine RPM. Inspect ignition cables for proper location. If ignition cables are properly routed, go to next step. If ignition cables are not properly routed, repair as necessary. Perform TEST VER-2A.
  3. Using equipment manufacturer's instructions, analyze secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair secondary ignition system as necessary. Perform TEST VER-2A.
  4. Using a spray bottle with water, spray secondary ignition cables. DO NOT spray inductive pick-up of test equipment. If ignition pattern did not change, go to next step. If ignition pattern changed, repair secondary ignition system as necessary. Perform TEST VER-2A.
  5. Using scan tool, monitor Idle Air Control (IAC) motor. Disconnect injector to cylinder which has DTC associated with it. If IAC motor stepped up idle, go to next step. If IAC motor did not step up idle, replace fuel injector. Perform TEST VER-2A.
  6. Turn engine off. Connect a vacuum gauge to engine intake. Start engine and run until normal operating temperature is reached. Apply parking brake. Put transmission in Neutral. Observe vacuum gauge. If vacuum gauge reads at least 13 in. Hg, to next step. If vacuum gauge does not read at least 13 in. Hg, go to TEST NTC-18A.
  7. Turn ignition off. Remove all spark plugs. Disconnect ASD relay. Test all cylinder for compression. If cylinder which caused this trouble code to set is within 25 percent of all other cylinders, go to next step. If cylinder which caused this trouble code to set is not within 25 percent of all other cylinders, repair engine mechanical problem as necessary. Perform TEST VER-2A.
  8. Inspect cam lobes for cylinder which caused this trouble code to set. If cam lobes are okay, replace spark plug for cylinder which caused this trouble code to set. Perform TEST VER-2A. If cam lobes are not okay, replace camshaft. Perform TEST VER-2A.
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