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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 126 (Engine Controls - Pinpoint Tests - 6.0L Diesel (99P F450/550)) >> Pinpoint Test E: Manifold Absolute Pressure (MAP) Sensor >> Test Procedure

Test Procedure

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  1. E1 PRELIMINARY DIAGNOSIS FOR DTCS P0236, P0237, OR P0238 
    • Carry out a visual inspection.
    • Retrieve and record all DTCs.
    • Record the freeze frame data.
    • Clear all DTCs.
    • Carry out the KOEO on-demand self-test.
    • Carry out the KOER on-demand self-test.

    Is DTC P0236, P0237 or P0238 present? 

    Yes No
    For DTC P0236, GO to  E2.
    For DTC P0237, GO to  E6.
    For DTC P0238, GO to  E10.    		 UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the fault. REPAIR as necessary. REFER to SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists.
  2. E2 DIAGNOSTIC TROUBLE CODE (DTC) P0236 
    • Possible causes:
      • restricted MAP hose
      • low turbo boost
      • intake manifold
      • restricted MAP sensor
      • PCM
    • Carry out a visual inspection.
    • Inspect the MAP sensor hose and manifolds for damage, leaks, restrictions, and correct routing.

    Are the manifolds and MAP sensor hose OK and free of damage? 

    Yes No
    GO to  E3. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
  3. E3 CHECK THE MAP SENSOR 
    NOTE: Refer to the EP SENSOR SPECIFICATIONS  at beginning of the pinpoint test.
    • Access the MAP VOLT PID.
    • Key ON, engine OFF.

    Is the voltage +/- 0.5 volts for the given altitude? 

    Yes No
    GO to  E4. INSTALL a new MAP sensor. CLEAR the DTCs. REPEAT the self-test.
  4. E4 CHECK THE MAP SENSOR VOLTAGE 
    NOTE: DTC P0069 MAP/Barometric Pressure Correlation will set.
    • Disconnect the pressure hose from the MAP sensor.
    • Key ON, engine OFF.
    • Using the Pressure Adapter Kit 014-00761, or equivalent (gauge bar), apply 69 kPa (10 psi) of pressure to the MAP sensor.
    • Measure the voltage between the MAP sensor signal pin 2, harness side and ground.

    Is the voltage reading 2.8 volts +/- 0.3 volts? 

    Yes No
    GO to  E5. INSTALL a new MAP sensor. CLEAR the DTCs. REPEAT the self-test.
  5. E5 CHECK THE MAP SENSOR PERFORMANCE 
    • Connect the pressure hose to MAP sensor.
    • Disconnect the MAP sensor pressure hose from the intake manifold and install a pressure (boost) gauge.
    • Record the gauge pressure.
    • Road test the vehicle and accelerate the vehicle to achieve full boost.

    Does the boost pressure exceed 82 kPa (12 psi) at full acceleration/boost and return to the recorded gauge pressure at idle? 

    Yes No
    CLEAR the DTCs. REPEAT the self-test. If the DTC is present again, INSTALL a new PCM. INSPECT the intake manifolds for leaks. CHECK the turbo condition. REFER to FUEL CHARGING AND CONTROLS - TURBOCHARGER . CLEAR the DTCs. REPEAT the self-test.
  6. E6 DIAGNOSTIC TROUBLE CODE (DTC) P0237 
    NOTE: Refer to Figure for PCM and component connector pin numbers at the beginning of this pinpoint test.
    • Possible causes:
      • MAP signal circuit open or shorted to ground
      • open VREF circuit
      • MAP sensor
      • PCM
    • Key OFF.
    • Disconnect the MAP sensor.
    • Key ON, engine OFF.
    • Measure the voltage between the MAP sensor VREF circuit pin 1, harness side and the MAP sensor signal return circuit pin 3, harness side.

    Is the voltage between 4.5 and 5.5 volts? 

    Yes No
    GO to  E7. REPAIR an open in the VREF or signal return circuit. CLEAR the DTCs. REPEAT the self-test.
  7. E7 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Key OFF.
    • Disconnect the PCM body harness electrical connector.
    • Measure the resistance between the MAP sensor pin 2, harness side and ground.

    Is the resistance greater than 10,000 ohms? 

    Yes No
    GO to  E8 REPAIR the short to ground in the signal circuit. CLEAR the DTCs. REPEAT the self-test.
  8. E8 CHECK THE SIGNAL CIRCUIT FOR AN OPEN 
    • Measure the resistance between MAP sensor signal circuit pin 2, harness side and the PCM body harness connector pin 41, harness side.

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  E9. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  9. E9 CHECK THE MAP SENSOR CIRCUIT 
    NOTE: This step may cause DTC P0238 to set.
    • Connect the PCM body harness connector.
    • Key ON, engine OFF.
    • Access the MAP VOLT PID.
    • Record the MAP VOLT PID reading.
    • Connect a 5-amp fused jumper wire between the MAP sensor VREF circuit, harness side and the MAP sensor signal circuit, harness side.

    Is the MAP PID voltage reading approximately 4.5 to 5.5 volts? 

    Yes No
    INSTALL a new MAP sensor. CLEAR the DTCs. REPEAT the self-test. INSTALL a new PCM. CLEAR the DTCs. REPEAT the self-test.
  10. E10 DIAGNOSTIC TROUBLE CODE (DTC) P0238 
    NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (exhaust system, turbocharger, performance chip). Refer to DIESEL ELECTRONIC ENGINE CONTROL (EEC) SYSTEM , MODIFICATIONS TO OBD VEHICLES .
    NOTE: Refer to Figure for PCM and component connector pin numbers at the beginning of this pinpoint test.
    • Possible causes:
      • signal circuit shorted to power
      • open ground circuit
      • MAP sensor
      • PCM
    • Simulate opposite DTC.
    • Clear all the DTCs.
    • Disconnect the MAP sensor electrical connector.
    • Carry out the on-demand self-test.

    Is DTC P0237 present? 

    Yes No
    REINSTALL a new MAP sensor. CLEAR the DTCs. REPEAT the self-test. GO to  E11.
  11. E11 CHECK THE MAP SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key OFF.
    • Disconnect the PCM body harness connector.
    • Key ON, engine OFF.
    • Measure the voltage between the MAP sensor pin 2, harness side and ground.

    Is the voltage less than 0.2 volts? 

    Yes No
    GO to  E12. REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  12. E12 CHECK THE MAP SENSOR SIGNAL RETURN CIRCUIT FOR AN OPEN 
    • Key OFF.
    • Measure the resistance between the MAP sensor connector pin 3, harness side and the PCM body connector pin 33, harness side.

    Is the resistance less than 5 ohms? 

    Yes No
    INSTALL a new PCM. CLEAR the DTCs. REPEAT the self-test. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
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