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Home >> Ford >> 2015 >> Transit-150 Base, 3.2L Eng VIN V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Pinpoint Tests (Diesel) >> Pinpoint Test J: Mass Airflow (MAF) Sensor >> Test Procedure

Test Procedure

  1. J1 PRELIMINARY DIAGNOSIS 
    NOTE: Diagnose circuit DTCs before range or performance DTCs.

    Are DTCs P00BC, P00BD, P0100, P0101, P0102, P0103, P02EC, P02ED, P1102, P1103, P2073 or P2074 present? 

    Yes No
    GO to J2  . For symptoms without DTCs, GO to J2  .
    For all others, RETURN to SYMPTOM CHARTS for further direction.
  2. J2 CHECK THE INTAKE AIR SYSTEM FOR CORRECT INSTALLATION, DAMAGE, LEAKS OR RESTRICTIONS 
    NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (exhaust system, turbocharger, performance chip). Refer to ENGINE CONTROL (EC) SYSTEM , Modifications to OBD Vehicles.
    • Ignition OFF.
    • Check all the intake air system components for correct installation, damage, leaks, or restrictions. Refer to the service information , Electronic Engine Controls, removal and installation procedures for correct installation of the intake air system components.
    • Check the throttle body bore for sludge.
    • Check the crankcase ventilation system for leaks or restrictions.
    • Check the charge air cooler (CAC) system for leaks or restrictions.

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to J3  .
  3. J3 CHECK FOR VOLTAGE AT THE SENSOR 
    • MAF/IAT Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) MAF/IAT Sensor Connector, Harness Side (-)
      VPWR - Pin 3 Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to J4  . REPAIR the open circuit.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.
  4. J4 CHECK FOR AN OPEN 
    • Ignition OFF.
    • MAF/IAT Sensor connector disconnected.
    • PCM-B connector disconnected.
    • Measure the resistance between:
      (+) MAF/IAT Sensor Connector, Harness Side (-) PCM-B Connector, Harness Side
      MAF - Pin 5 MAF - Pin 40
      SIGRTN - Pin 4 SIGRTN - Pin 60

    Are the resistances less than 5 ohms? 

    Yes No
    GO to J5  . REPAIR the open circuit.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.
  5. J5 CHECK FOR A SHORT TO GROUND 
    • Measure the resistance between:
      (+) MAF/IAT Sensor Connector, Harness Side (-)
      MAF - Pin 5 Ground
    • Measure the resistance between:
      (+) MAF/IAT Sensor Connector, Harness Side (-) MAF/IAT Sensor Connector, Harness Side
      MAF - Pin 5 SIGRTN - Pin 4

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to J6  . REPAIR the short circuit.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.
  6. J6 CHECK FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) MAF/IAT Sensor Connector, Harness Side (-)
      MAF - Pin 5 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to J7  .
  7. J7 INTERMITTENT CHECK 
    NOTE: The MAF_HZ PID value fluctuates while the engine is running.
    • Ignition OFF.
    • PCM-B connector connected.
    • MAF/IAT Sensor connector connected.
    • Ignition ON, engine running.
    • Access the PCM and control the EGR_A_CMD (PER) PID.
    • Decrease the EGR_A_CMD PID to 0%.
    • Access the PCM and control the EGRTP_CMD (PER) PID.
    • Decrease the EGRTP_CMD PID to 0%.
    • Access the PCM and control the VGTDC (PER) PID.
    • Decrease the VGTDC PID to 0%.
    • Access the PCM and monitor the MAF_HZ (FREQ) PID.
    • Record the MAF_HZ PID high and low values.
    • Set the scan tool MAF_HZ PID graph limits 0.2 kHz above and below the previously recorded high and low values.
    • While observing the PID, lightly tap on the MAF/IAT sensor and wiggle the harness from the MAF/IAT sensor to the PCM.

    Does the MAF_HZ PID reading exceed the set limits range? 

    Yes No
    INSTALL a new MAF/IAT sensor. REFER to the service information , Electronic Engine Controls.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to J8  .
  8. J8 CHECK THE INTAKE AIR SYSTEM FOR LEAKS AND RESTRICTIONS 
    NOTE: Pressure above 241 kPa (35 psi) can cause damage to system components. Regulate the shop air to 137.9 kPa (20 psi) before connecting to the system.
    NOTE: Remember to reinstall the exhaust gas recirculation temperature bank 1, sensor 2 (EGRT12) and remove the plastic bag from the air filter at the completion of this step.
    • Ignition OFF.
    • Remove the EGRT12 sensor.
    • Place the air filter in a plastic bag to prevent air flow out the intake port and reinstall it in the vehicle.
    • Connect the Rotunda Smoke Machine, Fuel Evaporative Emission System Tester 218-00001 (522) or equivalent to the intake air system using the appropriate adapter for the EGRT12 sensor fitting.
    • Fill the intake air system with smoke.
    • Pressurize the intake air system with 137.9 kPa (20 psi) regulated shop air.
    • Check the intake air system for leaks and restrictions.

    Are any leaks or restrictions present? 

    Yes No
    REPAIR the leaks or restrictions.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to J9  .
  9. J9 CHECK MAF SENSOR OPERATION 
    • Ignition ON, engine running.
    • Access the PCM and monitor the MAF_HZ (FREQ) PID.
    • Access the PCM and control the EGR_A_CMD (PER) PID.
    • Decrease the EGR_A_CMD PID to 0%.
    • Access the PCM and control the EGRTP_CMD (PER) PID.
    • Decrease the EGRTP_CMD PID to 0%.
    • Access the PCM and control the VGTDC (PER) PID.
    • Decrease the VGTDC PID to 0%.
    • Monitor the MAF_HZ PID at idle and record the value.
    • Access the PCM and control the RPMDSD (RPM) PID.
    • Increase the engine speed to 2, 000 RPM.
    • Record the MAF_HZ PID value.

    Is the MAF_HZ PID between 3.5-3.8 kHz at idle and 5.8-6.2 kHz at 2, 000 RPM? 

    Yes No
    For DTC P2073, INSTALL a new EGR valve.
    REFER to the service information , Engine Emission Control.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.
    For all others, GO to J10  .    		 INSTALL a new MAF/IAT sensor. REFER to the service information , Electronic Engine Controls.
    CARRY OUT the Reset And Clear The Specified Function MAF Sensor on the scan tool. REFER to CLEAR THE CONTINUOUS DIAGNOSTIC TROUBLE CODES (DTCS) AND RESET THE EMISSION MONITORS INFORMATION IN THE POWERTRAIN CONTROL MODULE (PCM) .
    Clear the PCM DTCs. REPEAT the self-test.
  10. J10 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test.
    • Verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time.
    The concern may have been caused by a loose or corroded connector.
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