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Test TC-118A - Fuel System Rich

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see appropriate WIRING DIAGRAMS - NON-TURBO article.
  1. FUEL SYSTEM RICH DTC sets when the Powertrain Control Module (PCM) performs a test to determine if fuel system is running too rich. If fuel system is running too rich for 2 trips, Malfunction Indicator Light (MIL) illuminates and a trouble code is stored. MIL remains on for more than one trip but goes out if conditions which occurred to set code are not found on subsequent trips. Possible causes are: plugged catalyst, failed PCM, engine parts tolerance, injectors stuck open, malfunctioning MAP sensor, malfunctioning upstream O2 sensor or faulty fuel pressure regulator. Go to next step.
  2. Perform O2 sensor heater test to verify O2 sensor heater is okay. A malfunctioning O2 sensor heater will cause O2 sensor voltage to remain at more than 1.5 volts. Go to next step to perform O2 sensor heater test.
  3. Using an external ohmmeter, check resistance between 2 White wires on upstream O2 sensor connector (sensor side). If resistance is 4-7 ohms, O2 sensor heater is okay, go to next step. If resistance is not 4-7 ohms, O2 sensor heater is malfunctioning. Replace upstream O2 sensor. Perform TEST VER-5A.
  4. Turn engine off. Turn ignition on. Using scan tool, read short and long adaptive memory values. If any long term adaptive memory is between negative 32 percent and negative 20 percent, go to TEST TC-118B. If any long term adaptive memory is not between negative 32 percent and negative 20 percent, condition to set trouble code is no longer present. Test is complete. Perform TEST VER-5A.
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