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Home >> Jeep >> 2019 >> Renegade High Altitude, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1379 (1.3L - DTCS P0107 To P025C) >> DTC Troubleshooting >> P0172-Fuel System 1/1 Rich >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Diagnose all other fuel or air handling DTCs before continuing.
      NOTE:

      Check for contaminants that may have damaged an O2 Sensor: contaminated fuel, unapproved silicone, oil or coolant contamination in the exhaust system.

    2. Start the engine.
    3. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    4. With the scan tool, read DTCs.
      NOTE:

      It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE OXYGEN SENSOR OPERATION 
    1. Perform the CHECKING THE OXYGEN SENSOR OPERATION test procedure. Refer to CHECKING THE OXYGEN SENSOR PERFORMANCE .

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. O2 SENSOR 1/1 HEATER OPERATION 
    1. Turn the ignition off.
      NOTE:

      Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize at 5.0 volts.

    2. Turn the ignition on.
    3. With the scan tool, actuate the O2 Sensor 1/1 Heater Test.
    4. With the scan tool, monitor O2 Sensor 1/1 voltage for at least two minutes.

      Does the voltage stay above 4.5 volts?

      Yes 

      No 

      • Go To  4
  4. CHECK THE MAP SENSOR OPERATION 
    1. Perform the CHECKING THE MAP SENSOR OPERATION test procedure. Refer to CHECKING THE MAP SENSOR PERFORMANCE .

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. EVAP PURGE SOLENOID OPERATION 
    1. Turn the ignition off.
    2. Disconnect the hoses at the Evap Purge Solenoid.
    3. Using a hand vacuum pump, apply 5.0 in. Hg. to the "ENGINE" side of the Evap Purge Solenoid.
      NOTE:

      The solenoid should hold vacuum for a minimum of 15 seconds.

      Did the Evap Purge Solenoid hold vacuum?

      Yes 

      • Go To  6

      No 

  6. CHECK THE FUEL DELIVERY SYSTEM 
    1. Perform the CHECKING THE FUEL DELIVERY SYSTEM test procedure. Refer to CHECKING THE FUEL DELIVERY SYSTEM (HARD START) .

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK THE EXHAUST SYSTEM FOR LEAKS 
    1. Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS test procedure. Refer to CHECKING THE EXHAUST SYSTEM FOR LEAKS .

      Were any problems found?

      Yes 

      • Repair as necessary in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. ENGINE MECHANICAL 
    1. Check for any of the following conditions/mechanical problems:
      • AIR INDUCTION SYSTEM - must be free from restrictions.
      • ENGINE VACUUM - must be at least 13 inches in neutral.
      • ENGINE VALVE TIMING - must be within specifications.
      • ENGINE COMPRESSION - must be within specifications.
      • FUEL - must be free of contamination.
      • FUEL INJECTOR - leaking injector or abnormal spray pattern.

      Are there any engine mechanical problems?

      Yes 

      No 

      • Go To  9
  9. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

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