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Home >> Plymouth >> 1996 >> Voyager Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.4L >> Trouble Code Tests >> Test TC-119A - Fuel System Lean

Test TC-119A - Fuel System Lean

NOTE: Very low fuel level could cause this Diagnostic Trouble Code (DTC) to be set. Ensure fuel tank is at least 1/4 full before proceeding.
  1. If vehicle ran out of fuel before coming in, using scan tool, clear Diagnostic Trouble Codes (DTCs) from Powertrain Control Module (PCM). Perform TEST VER-5A. If vehicle did not run out of fuel before coming in, go to next step.
  2. Turn ignition on. Using scan tool, check for stored DTCs. If DTCs exist that are related to a lean condition, refer to appropriate test for the specified DTC. If no DTCs exist that are related to a lean condition, go to next step.
  3. This DTC may be stored in Powertrain Control Module (PCM) when PCM determines the fuel system is running too lean for at least 2 trips. If this condition exists, Malfunction Indicator Light (MIL) on instrument panel will illuminate and remain on, but goes off if conditions required to set DTC are not found on the following trips.
  4. Possible causes are: defective wiring or connectors, defective fuel pump, fuel filter or injectors, defective fuel pressure regulator or fuel pump relay, defective MAP sensor or upstream oxygen sensor, defective ignition system components, defective exhaust pipe or manifold, defective PCM or engine mechanical problems. Go to next step.
  5. Turn ignition on with engine off. Using scan tool, monitor upstream oxygen sensor voltage for 5 minutes. Once upstream oxygen sensor voltage stabilizes between .4 and .6 volt or 5 minutes have passed, using scan tool, actuate upstream oxygen sensor heater test while monitoring upstream oxygen sensor voltage for at least 2 minutes.
  6. If upstream oxygen sensor voltage still remains .4-.6 volt, go to next step. If upstream oxygen sensor voltage does not remain .4-.6 volt, stop upstream oxygen sensor heater test. Perform TEST TC-119B.
  7. Stop upstream oxygen sensor heater test. Using scan tool, check for stored DTCs. If DTC for upstream O2 sensor heater failure exists, perform TEST TC-103A. If no DTC for upstream O2 sensor heater exists, go to next step.
  8. Turn ignition off. Replace upstream oxygen sensor, mounted on exhaust manifold. Start and idle engine until engine coolant temperature is at least 180°F (82°C). Allow engine to idle for at least 20 seconds after reaching normal operating temperature.
  9. Check for any exhaust leaks between engine and downstream oxygen sensor, mounted on exhaust pipe, behind catalytic converter. If no exhaust leaks exist, go to next step. If exhaust leaks exist, repair as necessary. Perform TEST VER-5A.
  10. Using scan tool, monitor upstream oxygen sensor state for at least 10 seconds. If oxygen sensor is switching between lean-center-rich at least 2 times within 10 seconds, go to step 13). If oxygen sensor is not switching between lean-center-rich at least 2 times within 10 seconds, go to next step.
  11. Shut engine off. Turn ignition on with engine off. Using scan tool, actuate fuel system test. Visually inspect injectors for leaks.
  12. If no leaks, stop fuel system test. Perform TEST TC-119B. If leaks exists, stop fuel system test. Replace leaking injector(s) as necessary. Perform TEST VER-5A.
  13. With engine running, using scan tool, read the short and long term adaptive memory values. If long term adaptive memory is more than +20 percent, turn ignition off. Perform TEST TC-119B. If long term adaptive memory is +20 percent or less, condition required to set DTC is not present. Test is complete.
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