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Home >> Dodge and Ram >> 1997 >> Caravan Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.4L >> Trouble Code Tests >> Test TC-118A - Fuel System Rich

Test TC-118A - Fuel System Rich

  1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If no stored DTCs exist pertaining to any oxygen sensors, go to next step. If any stored DTCs exist pertaining to any oxygen sensors, perform test procedures for that DTC before proceeding.
  2. This DTC may be stored in Powertrain Control Module (PCM) when PCM determines fuel system is running too rich for at least 2 trips. If this condition exists, Malfunction Indicator Light (MIL) in message center will illuminate and remain on, but goes off if conditions required to set DTC are not found on the following trips.
  3. Possible causes are: defective wiring or connectors, defective catalytic converter, defective intake air temperature sensor, defective EGR valve, defective fuel pump, defective injectors, defective fuel pressure regulator, defective MAP sensor, defective upstream oxygen sensor, defective PCM or engine mechanical problems. Go to next step.
  4. Perform oxygen sensor heater test. Go to step 2) in TEST TC-103A. If oxygen sensor heater passes the test, go to next step.
  5. Turn ignition on with engine off. Using using scan tool, read the long term adaptive memory values. If long term adaptive memory is -20 percent to -38 percent, perform TEST TC-118B. If long term adaptive memory is not -20 percent to -38 percent, condition required to set DTC is not present. Test is complete. Perform TEST VER-5A.
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