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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 747 (Engine Controls - Pinpoint Tests - 6.0L Diesel (99P E-Series & 99P F450/550)) >> Pinpoint Test E: Manifold Absolute Pressure (MAP) Sensor, Analog >> Test Procedure

Test Procedure

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  1. E1 PRELIMINARY DIAGNOSIS FOR DTCS P0236, P0237, P0238 
    • Perform the visual inspection.
    • Connect the scan tool.
    • Retrieve and record all DTCs.
    • Record freeze frame data.
    • Clear all DTCs.
    • Perform the KOEO On-Demand Self Test.
    • Perform 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 condition. CHECK for loose connection, damaged or corroded pins. WIGGLE 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
    • Perform visual inspection.
    • Inspect MAP sensor hose and manifolds for damage, leaks, restrictions and misrouting.

    ARE MANIFOLDS AND MAP HOSE OK AND FREE FROM DAMAGE? 

    Yes No
    Go to  E3. REPAIR leaks as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  3. E3 CHECK MAP SENSOR 
    NOTE: Refer to the MAP VOLTAGE TABLE  at beginning of the pinpoint test.
    • Access MAP VOLT PID.
    • Key on.

    IS THE VOLTAGE +/- 0.5 VOLTS FOR GIVEN ALTITUDE? 

    Yes No
    Go to  E4. INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  4. E4 MAP SENSOR VOLTAGE CHECK 
    • Disconnect pressure hose from MAP sensor.
    • Key on, engine off.
    • Using Pressure Adapter Kit 014-00761 or equivalent (gauge bar), apply 69 kPa (10 psi) of pressure to the MAP sensor.
    • Measure voltage between MAP sensor harness connector signal pin 2 and ground.

    IS THE VOLTAGE READING 2.8 VOLTS +/- 0.3 VOLTS? 

    Yes No
    Go to  E5. INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  5. E5 MAP PERFORMANCE TEST 
    • Connect pressure hose to MAP sensor.
    • Disconnect MAP sensor pressure hose from intake manifold and install a pressure (boost) gauge.
    • Record the gauge pressure.
    • Road test the vehicle and accelerate 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
    RESTORE the vehicle. CLEAR DTCs and RETEST the system. If DTC returns, INSTALL a new PCM. INSPECT intake manifolds for leaks. CHECK turbo condition, refer to the appropriate FUEL CHARGING AND CONTROLS article.
  6. E6 DIAGNOSTIC TROUBLE CODE (DTC) P0237 
    NOTE: Refer to the PCM and component connector pin numbers, Figure and Figure, 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.
    • Measure the voltage between the VREF circuit pin 1 and signal return circuit pin 3.

    IS THE VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? 

    Yes No
    Go to  E7. REPAIR open in VREF or signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  7. E7 CHECK SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Key off.
    • Disconnect the PCM body harness electrical connector.
    • Measure the resistance between the MAP sensor harness connector pin 2 and ground.

    IS THE RESISTANCE GREATER THAN 10,000 OHMS? 

    Yes No
    Go to  E8. REPAIR short to ground in the signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  8. E8 CHECK SIGNAL CIRCUIT FOR AN OPEN 
    • Measure the resistance between MAP sensor electrical connector signal circuit pin 2 and PCM body harness electrical connector pin 41.

    IS THE RESISTANCE LESS THAN 5 OHMS? 

    Yes No
    Go to  E9. REPAIR open in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  9. E9 CHECK MAP SENSOR CIRCUIT 
    NOTE: This step may cause DTC P0238 to set.
    • Reconnect the PCM body harness connector.
    • Key on, engine off.
    • Access MAP VOLT PID.
    • Record the MAP VOLT PID reading.
    • Install a jumper wire between MAP sensor VREF circuit and signal circuit.

    IS THE MAP PID VOLTAGE READING APPROXIMATELY 4.0 TO 5.5 VOLTS? 

    Yes No
    INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  10. E10 DIAGNOSTIC TROUBLE CODE (DTC) P0238 
    NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (exhaust system, turbocharger, performance chip, etc.). Refer to Diesel Electronic Control (EC) System, MODIFICATIONS TO OBD VEHICLES .
    NOTE: Refer to the PCM and component connector pin numbers, Figure and Figure, at the beginning of this pinpoint test.
    • Possible causes:
      • signal circuit shorted to power
      • open ground circuit
      • MAP sensor
      • PCM
    • Induce opposite DTC.
    • Install the scan tool.
    • Clear all DTCs.
    • Disconnect the MAP sensor electrical connector.
    • Perform the On-Demand Self Test.

    IS DTC P0237 SET? 

    Yes No
    INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to  E11.
  11. E11 CHECK MAP SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key off.
    • Disconnect the PCM body harness connector.
    • Key on.
    • Measure the voltage between the MAP sensor harness connector pin 2 and ground.

    IS THE VOLTAGE LESS THAN 0.2 VOLTS? 

    Yes No
    Go to  E12. REPAIR short to voltage in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
  12. E12 CHECK MAP SENSOR SIGNAL RETURN FOR AN OPEN 
    • Key off.
    • Measure the resistance between MAP sensor harness connector pin 3 signal return and PCM body harness electrical connector pin 33.

    IS THE RESISTANCE LESS THAN 5 OHMS? 

    Yes No
    INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
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