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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Pinpoint Tests (Pinpoint Test A - Pinpoint Test H) (Except Diesel & Hybrid) >> Pinpoint Tests DW: Heated Oxygen Sensor (HO2S) >> Test Procedure

Test Procedure

  1. DW1 CHECK FOR DTCS 

    Are DTCs P0030, P0036, P0037, P0038, P0041, P0053, P0054, P0056, P0060, P00D2, P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0139, P013A, P013B, P013C, P013E, P0140, P0141, P014A, P0157, P0158, P0159, P0161, P016A, P2270, P2271, P2272, P2273, P2297, P2A01 or P2A04 present? 

    Yes No
    GO to  DW2. RETURN to SYMPTOM CHARTS for further direction.
  2. DW2 VISUALLY INSPECT THE HO2S HARNESS 
    • Ignition OFF.
    • Verify the HO2S connectors are connected to the correct engine bank.
    • Visually inspect for:
      • crossed sensor wires
      • pinched, shorted or corroded wiring and pins
      • oil or water contamination
      • damaged HO2S

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 For DTC P0041, GO to  DW3.
    For DTCs P013A, P013C, P013E, P014A, P016A, P2270, P2271, P2272, P2273 or P2297, GO to  DW4.
    For DTCs P0036, P0056, P0137 or P0157, GO to  DW9.
    For DTCs P0030, P0037, P0038, P0053, P0054, P0060, P0135, P0141 or P0161, GO to  DW15.
    For all others, GO to  DW5.
  3. DW3 CARRY OUT THE KOER SELF-TEST 
    • Engine at normal operating temperature.
    • Carry out the PCM KOER self-test.

    Is DTC P0041 present? 

    Yes No
    GO to  DW9. GO to  DW4.
  4. DW4 CHECK FOR A SOURCE OF POTENTIAL HO2S CONTAMINATION 
    • Investigate the following items as potential sources of HO2S contamination:
      • use of unapproved silicon sealers
      • fuel contaminated by silicon additives
      • excessive oil consumption
      • glycol leaking internally in the engine
      • contaminated fuel
      • short drive cycles in cold weather
      • use of unapproved cleaning agents

    Is a concern present? 

    Yes No
    REPAIR the source of the contamination.
    CHANGE the engine oil and oil filter.
    RESET the keep alive memory (KAM). Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.    		 GO to  DW5.
  5. DW5 CHECK FOR UNMETERED AIR LEAKS 
    NOTE: Fuel calculations can be affected by unmetered air leaks.
    • Carefully inspect the following areas for potential air leaks:
      • hoses connecting to the mass air flow (MAF) sensor assembly
      • hoses connecting to the throttle body
      • intake manifold gasket leaks
      • positive crankcase ventilation (PCV) system
      • the vacuum lines are disconnected
      • incorrectly seated engine oil dipstick, tube or oil fill cap

    Are any air leaks present? 

    Yes No
    REPAIR the source of the air leak. RESET the keep alive memory (KAM). Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.    		 For DTCs P0130, P0131, P0132, P0133 or P0134, GO to  DW8.
    For all others, GO to  DW6.
  6. DW6 CHECK FOR EXHAUST SYSTEM CONCERNS 
    NOTE: Pressure above 241 kPa (35 psi) can cause damage to system components. Regulate the shop air to 34.4 kPa (5 psi) before connecting to the system.
    NOTE: The DTCs P013A, P013E, P2270 and P2271 refer to the HO2S12 sensor and DTCs P013C, P014A, P2272 and P2273 refer to the HO2S22 sensor that are located after the catalyst. Before installing a new HO2S12 sensor or HO2S22 sensor, refer to the 4 pin HO2S sensor connector view at the beginning of this pinpoint test to verify the correct HO2S sensor replacement.
    • Pressurize the exhaust system at the exhaust pipe outlet with 34.4 kPa (5 psi) regulated shop air.
    • Check the exhaust system for leaks using a soap and water solution.
    • Apply the soap and water solution to the following areas:
      • the exhaust flanges and gaskets
      • the universal HO2S and mounting surface
      • the exhaust system in between the universal HO2S and the downstream HO2S
      • the downstream HO2S and mounting surface
      • the exhaust system within 15.25 cm (6 inches) of the downstream HO2S and mounting surface
    • Check the exhaust flange bolts for correct torque.
    • Check the downstream HO2S for correct torque.

    Is a concern present? 

    Yes No
    For DTCs P013A or P013C, REPAIR as necessary.
    CARRY OUT the HO2S and Catalyst OBD Monitor Drive Cycle Procedures. REfer to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    Clear the PCM DTCs. REPEAT the self-test.
    If DTCs P013A or P013C are retrieved again, GO to  DW7.
    For DTCs P013E, P014A, P2270, P2271, P2272 or P2273, REPAIR as necessary.
    CARRY OUT the HO2S and Catalyst OBD Monitor Drive Cycle Procedures. REfer to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    Clear the PCM DTCs. REPEAT the self-test.
    For all others, REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 For DTCs P013A or P013C, GO to  DW7.
    For DTCs P013E, P014A, P2270, P2271,
    P2272 or P2273, INSTALL a new HO2S. REFER to the appropriate Electronic Engine Controls article.
    CARRY OUT the HO2S and Catalyst OBD Monitor Drive Cycle Procedures. REfer to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    Clear the PCM DTCs. REPEAT the self-test.
    For all others, GO to  DW8.
  7. DW7 CHECK THE CATALYTIC CONVERTER 
    NOTE: Internal damage of a catalytic converter is usually caused by abnormal engine operation upstream of the catalyst. Events that can produce higher than normal temperatures in the catalyst are particularly suspect. For example, misfiring can cause higher than normal catalyst operating temperatures.
    NOTE: The DTCs P013A and P013E refer to the HO2S12 sensor and DTCs P013C and P014A refer to the HO2S22 sensor that are located after the catalyst. Before installing a new HO2S12 sensor or HO2S22 sensor, refer to the 4 pin HO2S sensor connector view at the beginning of this pinpoint test to verify the correct HO2S sensor replacement.
    • Inspect the catalyst substrate for damage.

    Is a concern present? 

    Yes No
    INSTALL a new monitored catalyst only, for the bank referenced. Do not install a new unmonitored catalyst unless it is repaired as an assembly. REFER to the appropriate Exhaust System article.
    CARRY OUT the HO2S and Catalyst OBD Monitor Drive Cycle Procedures. REfer to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    Clear the PCM DTCs. REPEAT the self-test.    		 INSTALL a new HO2S. REFER to the appropriate Electronic Engine Controls article. CARRY OUT the HO2S and Catalyst OBD Monitor Drive Cycle Procedures. REfer to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
    Clear the PCM DTCs. REPEAT the self-test.
  8. DW8 CHECK FOR FUEL SELECTION CONCERNS 
    • Verify with the customer that flex fuel is not being used on a non-flex fuel vehicle.

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 For DTCs P0130, P0131, P0132, P0133, P0134, P016A or P2297, GO to  DW11.
    For all others, GO to  DW9.
  9. DW9 CHECK THE SENSOR 
    NOTE: The HO2S heaters must be ON for 2 minutes before continuing diagnosis.
    • Ignition ON, engine running.
    • Allow the engine to idle until the HO2S heater PID indicates ON for 2 minutes.
    • For the HO2S12,
    • Access the PCM and monitor the HTR12 (MODE) PID.
    • Access the PCM and control the EQRAT11_DSD (RATIO) PID.
    • Command the PID to 13:1.
    • Access the PCM and monitor the O2S12 (VOLT) PID.
    • Record the PID value.
    • For the HO2S22,
    • Access the PCM and monitor the HTR22 (MODE) PID.
    • Access the PCM and control the EQRAT21_DSD (RATIO) PID.
    • Command the PID to 13:1.
    • Access the PCM and monitor the O2S22 (VOLT) PID.
    • Record the PID value.

    Is the PID voltage approximately 0.8V? 

    Yes No
    GO to  DW10. GO to  DW12.
  10. DW10 CARRY OUT A THOROUGH WIGGLE TEST ON THE HO2S HARNESS 
    NOTE: The HO2S heaters must be ON for 2 minutes before continuing diagnosis.
    • For the HO2S12,
    • Access the PCM and monitor the HTR12 (MODE) PID.
    • Access the PCM and control the EQRAT11_DSD (RATIO) PID.
    • Command the PID to 13:1.
    • Access the PCM and monitor the O2S12 (VOLT) PID.
    • Carry out a thorough wiggle test on the HO2S12 harness.
    • For the HO2S22,
    • Access the PCM and monitor the HTR22 (MODE) PID.
    • Access the PCM and control the EQRAT21_DSD (RATIO) PID.
    • Command the PID to 13:1.
    • Access the PCM and monitor the O2S22 (VOLT) PID.
    • Carry out a thorough wiggle test on the HO2S22 harness.

    Does the voltage change during the wiggle test? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 For DTCs P00D2, P0036, P0056, P0137 or P0157, GO to  DW12.
    For all others, GO to PINPOINT TEST Z .
  11. DW11 CARRY OUT A WIGGLE TEST ON THE HO2S HARNESS 
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the O2S11_IMPED (VOLT) PID.
    • Carry out a thorough wiggle test on the HO2S11 harness.

    Does the voltage change during the wiggle test? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DW12.
  12. DW12 CHECK THE HO2S CIRCUITS FOR AN OPEN 
    NOTE: Check both halves of the HO2S connector for any water contamination.
    • Ignition OFF.
    • PCM connector disconnected.
    • For the HO2S11,
    • HO2S11 connector disconnected.
    • Measure the resistance between:
      (+) HO2S11 Connector, Harness Side (-) PCM Connector, Harness Side
      HO2S11 HO2S11
      SIGRTN SIGRTN
    • For the HO2S12,
    • HO2S12 connector disconnected.
    • Measure the resistance between:
      (+) HO2S12 Connector, Harness Side (-) PCM Connector, Harness Side
      HO2S12 HO2S12
      SIGRTN SIGRTN
    • For the HO2S22,
    • HO2S22 connector disconnected.
    • Measure the resistance between:
      (+) HO2S22 Connector, Harness Side (-) PCM Connector, Harness Side
      HO2S22 HO2S22
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DW13. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  13. DW13 CHECK THE HO2S CIRCUITS FOR A SHORT 
    • For the HO2S11,
    • Measure the resistance between:
      (+) HO2S11 Connector, Harness Side (-) HO2S11 Connector, Harness Side
      HO2S11 SIGRTN
      HO2S11 VPWR
      HO2S11 HTR11
    • Measure the resistance between:
      (+) HO2S11 Connector, Harness Side (-)
      HO2S11 Ground
    • For the HO2S12,
    • Measure the resistance between:
      (+) HO2S12 Connector, Harness Side (-) HO2S12 Connector, Harness Side
      HO2S12 SIGRTN
      HO2S12 VPWR
      HO2S12 HTR12
    • Measure the resistance between:
      (+) HO2S12 Connector, Harness Side (-)
      HO2S12 Ground
    • For the HO2S22,
    • Measure the resistance between:
      (+) HO2S22 Connector, Harness Side (-) HO2S22 Connector, Harness Side
      HO2S22 SIGRTN
      HO2S22 VPWR
      HO2S22 HTR22
    • Measure the resistance between:
      (+) HO2S22 Connector, Harness Side (-)
      HO2S22 Ground

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DW14. REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
  14. DW14 CHECK THE HO2S CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • For the HO2S11,
    • Measure the voltage between:
      (+) HO2S11 Connector, Harness Side (-)
      HO2S11 Ground
    • For the HO2S12,
    • Measure the voltage between:
      (+) HO2S12 Connector, Harness Side (-)
      HO2S12 Ground
    • For the HO2S22,
    • Measure the voltage between:
      (+) HO2S22 Connector, Harness Side (-)
      HO2S22 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.    		 For DTCs P00D2, P0036, P0056, P0137 or P0157, GO to  DW15.
    For DTCs P0041, P0133, P0134, P0139, P0159, P2A01 or P2A04, GO to PINPOINT TEST Z .
    For all others, INSTALL a new HO2S. REFER to the appropriate Electronic Engine Controls article.
    RESET the keep alive memory (KAM). Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.
  15. DW15 CHECK FOR VPWR 
    NOTE: Diagnose the suspect sensor indicated by the DTC.
    • Ignition OFF.
    • PCM connector connected.
    • For the HO2S11,
    • HO2S11 connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) HO2S11 Connector, Harness Side (-)
      VPWR Ground
    • For the HO2S12,
    • HO2S12 connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) HO2S12 Connector, Harness Side (-)
      VPWR Ground
    • For the HO2S22,
    • HO2S22 connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) HO2S22 Connector, Harness Side (-)
      VPWR Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  DW16. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  16. DW16 CHECK THE HO2S HEATER CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • PCM connector disconnected.
    • For the HO2S11,
    • Measure the resistance between:
      (+) HO2S11 Connector, Harness Side (-) PCM Connector, Harness Side
      HTR11 HTR11
    • For the HO2S12,
    • Measure the resistance between:
      (+) HO2S12 Connector, Harness Side (-) PCM Connector, Harness Side
      HTR12 HTR12
    • For the HO2S22,
    • Measure the resistance between:
      (+) HO2S22 Connector, Harness Side (-) PCM Connector, Harness Side
      HTR22 HTR22

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  DW17. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  17. DW17 CHECK THE HO2S HEATER FOR SHORT CIRCUITS 
    • For the HO2S11,
    • Measure the resistance between:
      (+) HO2S11 Connector, Harness Side (-)
      HTR11 Ground
    • Measure the resistance between:
      (+) HO2S11 Connector, Harness Side (-) HO2S11 Connector, Harness Side
      HTR11 VPWR
      HTR11 SIGRTN
      HTR11 HO2S11
    • For the HO2S12,
    • Measure the resistance between:
      (+) HO2S12 Connector, Harness Side (-)
      HTR12 Ground
    • Measure the resistance between:
      (+) HO2S12 Connector, Harness Side (-) HO2S12 Connector, Harness Side
      HTR12 VPWR
      HTR12 SIGRTN
      HTR12 HO2S12
    • For the HO2S22,
    • Measure the resistance between:
      (+) HO2S22 Connector, Harness Side (-)
      HTR22 Ground
    • Measure the resistance between:
      (+) HO2S22 Connector, Harness Side (-) HO2S22 Connector, Harness Side
      HTR22 VPWR
      HTR22 SIGRTN
      HTR22 HO2S22

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DW18. REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  18. DW18 CHECK THE INTERNAL RESISTANCE OF THE HO2S HEATER 
    • For the HO2S11,
    • Measure the resistance between:
      (+) HO2S11 Connector, Component Side (-) HO2S11 Connector, Component Side
      HTR11 VPWR
    • For the HO2S12,
    • Measure the resistance between:
      (+) HO2S12 Connector, Component Side (-) HO2S12 Connector, Component Side
      HTR12 VPWR
    • For the HO2S22,
    • Measure the resistance between:
      (+) HO2S22 Connector, Component Side (-) HO2S22 Connector, Component Side
      HTR22 VPWR

    Is the resistance between 2 - 30 ohms? 

    Yes No
    GO to  DW19. INSTALL a new HO2S. REFER to the appropriate Electronic Engine Controls article. RESET the keep alive memory (KAM). Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.
  19. DW19 CHECK THE HEATER CIRCUIT FOR AN INTERNAL SHORT TO GROUND 
    • For the HO2S11,
    • Measure the resistance between:
      (+) HO2S11 Connector, Component Side (-) HO2S11 Connector, Component Side
      HTR11 SIGRTN
    • Measure the resistance between:
      (+) HO2S11 Connector, Component Side (-)
      HTR11 Ground
    • For the HO2S12,
    • Measure the resistance between:
      (+) HO2S12 Connector, Component Side (-) HO2S12 Connector, Component Side
      HTR12 SIGRTN
    • Measure the resistance between:
      (+) HO2S12 Connector, Component Side (-)
      HTR12 Ground
    • For the HO2S22,
    • Measure the resistance between:
      (+) HO2S22 Connector, Component Side (-) HO2S22 Connector, Component Side
      HTR22 SIGRTN
    • Measure the resistance between:
      (+) HO2S22 Connector, Component Side (-)
      HTR22 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    For DTC P00D2, GO to PINPOINT TEST Z .
    For all others, GO to  DW20.    		 INSTALL a new HO2S. REFER to the appropriate Electronic Engine Controls article.
    RESET the keep alive memory (KAM). Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.
  20. DW20 CHECK FOR CORRECT OPERATION 
    • Ignition OFF.
    • Disconnect all the PCM connectors.
    • Disconnect the HO2S12 and the HO2S22 connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and the HO2S12 and the HO2S22 connectors. Make sure the connectors are seated correctly.
    • Reset the keep alive memory (KAM), Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    • Carry out the PCM self-test.
    • Verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new HO2S in question. REFER to the appropriate Electronic Engine Controls article.
    RESET the keep alive memory (KAM). Refer to RESETTING THE KEEP ALIVE MEMORY (KAM) .
    REPEAT the self-test.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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