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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (3.2L - DTCS P1718 To U0102) >> DTC Troubleshooting >> P219B-Bank 2 Air-Fuel Ratio Imbalance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Start the engine.
    2. Allow the engine to reach normal operating temperature.
    3. Test drive the vehicle in accordance with the when monitored conditions.
    4. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK FOR AN INTAKE MANIFOLD LEAK AT A SPECIFIC CYLINDER ON BANK 2 
    1. Check for any of the following conditions:
      • Intake manifold seals leaking at a specific cylinder.
      • Intake plenum leak at a specific cylinder.
      • Warped/cracked Intake Manifold or plenum.
      • Vacuum leak at a Fuel Injector O-Rings.

      Were any Intake or vacuum leak issues found?

      Yes 

      No 

      • Go To  3
  3. CHECK FOR FUEL INJECTOR ISSUES AT A SPECIFIC CYLINDER ON BANK 2 
    1. Check for any of the following conditions, but not limited to:
      • Verify correct voltage supply at each Fuel Injector.
      • Verify correct control circuit operation at each Fuel Injector.
      • Verify correct Fuel Injector operation (spray pattern).

      Were any Fuel Injector, voltage supply, operation (spray pattern) issues found?

      Yes 

      • Repair the Fuel Injector voltage supply, control circuit, or injector (spray pattern) as necessary.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L . .

      No 

      • Go To  4
  4. CHECK THE CYLINDERS ON BANK 2 FOR LOW COMPRESSION AND IGNITION SYSTEM ISSUES 
    1. Perform a cylinder compression and/or cylinder leak down test on each cylinder on bank 2.
    2. Check the ignition system for any of the following conditions, but not limited to:
      • Verify correct voltage supply at each Ignition Coil.
      • Verify correct control circuit operation at each Ignition Coil.
      • Verify that the Spark Plugs are matching and are equivalent to OEM specifications.
      • Verify correct Spark Plug gap.
      • Visually inspect the Ignition Coils and Spark Plugs for signs of carbon tracking.
      • Visually inspect the Ignition Coils for signs of damage.

      Were any cylinder compression or ignition system issues found?

      Yes 

      No 

      • Go To  5
  5. CLEAN THE VALVE TRAIN AND COMBUSTION CHAMBERS 
    1. Using the Mopar Combustion cleaner, de-carbon the engine.
    2. After driving and clearing the combustion cleaner from the engine, erase any DTCs with the scan tool.
    3. Test drive the vehicle in accordance with the when monitored conditions.
    4. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  6

      No 

  6. CHECK FOR VALVETRAIN AND VARIABLE VALVE SYSTEM ISSUES 
    1. Check the valvetrain for any of the following conditions:
      • Verify correct operation of the Camshaft Phasers.
      • Verify correct operation of the Oil Control Valves.
      • Check for broken, worn or improperly installed valve springs.
      • Check for broken, worn or improperly installed Camshaft followers.
      • Check for worn Camshaft lobes.

      Were any valvetrain and variable valve system issues found?

      Yes 

      No 

      • Go To  7
  7. REPLACE THE BANK 2 UPSTREAM O2 SENSOR AND RETEST FOR DTCS 
    1. Replace the Bank 2 Upstream O2 Sensor in accordance with the Service Information. Refer to SENSOR, OXYGEN, INSTALLATION, 3.2L .
    2. Reconnect the Bank 2 Upstream O2 Sensor harness connector.
    3. Turn the ignition on.
    4. With the scan tool, erase DTCs.
    5. Using the Freeze Frame Data or When Monitored Conditions above, operate the vehicle within the conditions that set the DTC.
    6. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  8

      No 

  8. 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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