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Test Procedure

  1. DM1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 

    Are DTCs P0106, P0107, P0108, P0109, P012B, P012C, P012D, or P012E present? 

    Yes No
    GO to DM2  . For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. DM2 MONITOR THE MAP PID 
    • Ignition ON, engine OFF.
    • For Mustang with 5.8L engine,
    • Access the PCM and monitor the SCIP_V (VOLT) PID.
    • For all others,
    • Access the PCM and monitor the MAP (VOLT) PID.

    Is the voltage between 0.05 - 4.95 V? 

    Yes No
    For DTCs P0106 or P012B, GO to  DM9.
    For all others, GO to  DM8.    		 GO to DM3  .
  3. DM3 CHECK THE VOLTAGE BETWEEN THE VREF AND SIGRTN CIRCUITS 
    • For vehicles with an ESM,
    • ESM connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) ESM Connector, Harness Side (-) ESM Connector, Harness Side
      VREF - Pin 2 SIGRTN - Pin 6
    • For all others,
    • MAP Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) MAP Sensor Connector, Harness Side (-) MAP Sensor Connector, Harness Side
      VREF SIGRTN

    Is the voltage between 4.5 - 5.5 V? 

    Yes No
    GO to DM4  . GO to PINPOINT TEST C .
  4. DM4 CHECK THE MAP AND SIGRTN CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • PCM connector disconnected.
    • For vehicles with an ESM,
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) ESM Connector, Harness Side
      MAP MAP - Pin 3
      SIGRTN SIGRTN - Pin 6
    • For all others,
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) MAP Sensor Connector, Harness Side
      MAP MAP
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to DM5  . REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  5. DM5 CHECK THE MAP CIRCUIT FOR A SHORT TO SIGRTN OR GROUND 
    • For vehicles with an ESM,
    • Measure the resistance between:
      (+) ESM Connector, Harness Side (-)
      MAP - Pin 3 Ground
    • Measure the resistance between:
      (+) ESM Connector, Harness Side (-) ESM Connector, Harness Side
      MAP - Pin 3 SIGRTN - Pin 6
    • For all others,
    • Measure the resistance between:
      (+) MAP Sensor Connector, Harness Side (-)
      MAP Ground
    • Measure the resistance between:
      (+) MAP Sensor Connector, Harness Side (-) MAP Sensor Connector, Harness Side
      MAP SIGRTN

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to DM6  . REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
  6. DM6 CHECK THE MAP CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • For vehicles with an ESM,
    • Measure the voltage between:
      (+) ESM Connector, Harness Side (-)
      MAP - Pin 3 Ground
    • For all others,
    • Measure the voltage between:
      (+) MAP Sensor Connector, Harness Side (-)
      MAP Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. GO to DM7  .
  7. DM7 INDUCE THE OPPOSITE MAP SENSOR VOLTAGE 
    • PCM connector connected.
    • For vehicles with an ESM,
    • Connect a 5 amp fused jumper wire between the following:
      Point A ESM Connector, Harness Side Point B ESM Connector, Harness Side
      MAP - Pin 3 SIGRTN
    • For all others,
    • Connect a 5 amp fused jumper wire between the following:
      Point A MAP Sensor Connector, Harness Side Point B MAP Sensor Connector, Harness Side
      MAP SIGRTN
    • Ignition ON, engine OFF.
    • For Mustang with 5.8L engine,
    • Access the PCM and monitor the SCIP_V (VOLT) PID.
    • For all others,
    • Access the PCM and monitor the MAP (VOLT) PID.

    Is the voltage less than 4.6 V? 

    Yes No
    For vehicles with an ESM, INSTALL a new ESM. REFER to the appropriate Engine Emission Control article.
    Clear the PCM DTCs. REPEAT the self-test.
    For all others, INSTALL a new MAP sensor. REFER to the appropriate Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DM10.
  8. DM8 CHECK THE CIRCUITS FOR INTERMITTENT CONCERNS 
    • Ignition ON, engine OFF.
    • For Mustang with 5.8L engine,
    • Access the PCM and monitor the SCIP_V (VOLT) PID.
    • For all others,
    • Access the PCM and monitor the MAP (VOLT) PID.
    • Carry out a thorough wiggle test on the ESM or MAP sensor harness.
    • Lightly tap on the ESM or MAP sensor and wiggle the harness connector to simulate road shock.

    Does a sudden change in voltage occur while monitoring the PID? 

    Yes No
    ISOLATE the concern. REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 Unable to duplicate or identify the concern at this time.
    GO to PINPOINT TEST Z .
  9. DM9 KOEO AND KOER MAP VOLTAGE 
    • Ignition ON, engine OFF.
    • For Mustang with 5.8L engine,
    • Access the PCM and monitor the SCIP_V (VOLT) PID.
    • For all others,
    • Access the PCM and monitor the MAP (VOLT) PID.
    • Record the KOEO MAP voltage.
    • Ignition ON, engine running.
    • Record the KOER MAP voltage.

    Does the PID value change? 

    Yes No
    Unable to duplicate or identify the concern at this time.
    GO to PINPOINT TEST Z .    		 For vehicles with an ESM, CHECK the MAP hose (if equipped) for freezing or obstructions. If OK, INSTALL a new ESM. REFER to the appropriate Engine Emission Control article.
    Clear the PCM DTCs. REPEAT the self-test.
    For all others, INSTALL a new MAP sensor. REFER to the appropriate Electronic Engine Controls article.
    Clear the PCM DTCs. REPEAT the self-test.
  10. DM10 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) , Programming the VID Block for a Replacement PCM. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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