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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 794 (Supplemental Restraint System) >> Diagnosis And Testing >> Pinpoint Tests - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test U: LFC 42/DTC B2227 - Front Impact Severity Sensor Communication Fault >> Pinpoint Test U: DTC B2227 - Restraint System - Impact Sensor Fault

Pinpoint Test U: DTC B2227 - Restraint System - Impact Sensor Fault

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out thorough Inspection and Verification  before proceeding with the Pinpoint Test.
  1. U1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    WARNING: Restraint system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove restraint system diagnostic tools could result in injury and possible violation of vehicle safety standards.
    WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.
    WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.
    CAUTION: To avoid potential damage to the restraints control module (RCM), make sure the RCM and bracket assembly is secured to the floor pan and the SRS is depowered before either disconnecting or reconnecting the RCM electrical connectors.
    NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    • Enter the following diagnostic mode on the scan tool: Retrieve/Record Continuous DTCs.
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC B2227 retrieved during the on-demand self test? 
    • Yes  : This is a hard fault. The fault condition is still present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. GO to U2.
    • No  : This is an intermittent fault. The fault condition is not present at this time. GO to  U12.
  2. U2 INSPECT THE FRONT IMPACT SEVERITY SENSOR MOUNTING, MOUNTING SURFACE 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Access the front impact severity sensor. Refer to FRONT IMPACT SEVERITY SENSOR .
    • Inspect the front impact severity sensor for:
      • loose electrical connector.
      • loose sensor mounting bolts.
    • Remove the front impact severity sensor. Refer to FRONT IMPACT SEVERITY SENSOR .
    • Visually inspect the front impact severity sensor, alignment tabs, electrical connector, and mounting surface for damage, corrosion or dirt.
    • Was a significant amount of corrosion or dirt found, or was the front severity impact sensor attached to the mounting surface incorrectly or were the sensor bolts not fully seated and tightened correctly? 
    • Yes  : CLEAN and TIGHTEN bolts to required specifications, or REPAIR the mounting surface as necessary. REINSTALL the front impact severity sensor. GO to  U13.
    • No  : GO to U3.
  3. U3 CHECK THE FRONT IMPACT SEVERITY SENSOR GROUND CIRCUIT 618 (PK/LG) FOR HIGH RESISTANCE 
    • Reinstall the front impact severity sensor. For additional information, refer to FRONT IMPACT SEVERITY SENSOR .
    • Disconnect: Front Impact Severity Sensor C177.
    • Measure the resistance between front impact severity sensor C177 pin 2, circuit 618 (VT/LG), harness side and front impact severity sensor case ground.
      Fig 1: Measuring Resistance Between Front Impact Severity Sensor Pin 2 And Front Impact Severity Sensor Case Ground
      G03891316Courtesy of FORD MOTOR CO.
    • Is the resistance less than 100 ohms? 
    • Yes  : GO to  U5.
    • No  : GO to U4.
  4. U4 CHECK THE FRONT IMPACT SEVERITY MOUNTING 
    • Remove the front impact severity sensor.
    • Clean and repair the mounting surface as necessary.
    • Clean the front impact severity sensor mounting bolts.
    • Install the front impact severity sensor.
    • Repower the system. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC B2227 retrieved during the on-demand self test? 
    • Yes  : GO to U5.
    • No  : Fault corrected. GO to  U13.
  5. U5 CHECK CIRCUIT 617 (VT/OG) AND CIRCUIT 618 (VT/LG) FOR A SHORT TO VOLTAGE BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Disconnect: RCM C310b.
    • Repower the system. Do not  prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Key in ON position.
    • Measure the voltage resistance between front impact severity sensor C177 pin 1, circuit 617 (VT/OG), harness side and ground; and between front impact severity sensor C177 pin 2, circuit 618 (VT/LG), harness side and ground.
      Fig 2: Measuring Voltage Resistance Between Front Impact Severity Sensor Pin 1 And Ground
      G03891317Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    • Yes  : GO to U6.
    • No  : REPAIR circuit 617 (VT/OG) or circuit 618 (VT/LG). GO to  U13.
  6. U6 CHECK CIRCUIT 617 (VT/OG) AND CIRCUIT 618 (VT/LG) FOR A SHORT TO GROUND BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR 
    • Key in OFF position.
    • Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • Measure the resistance between front impact severity sensor C177 pin 1, circuit 617 (VT/OG), harness side and ground; and between front impact severity sensor C177 pin 2, circuit 618 (VT/LG), harness side and ground.
      Fig 3: Measuring Voltage Resistance Between Front Impact Severity Sensor Pin 1 And Ground
      G03891318Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to U7.
    • No  : REPAIR circuit 617 (VT/OG) or circuit 618 (VT/LG). GO to  U13.
  7. U7 CHECK CIRCUIT 617 (VT/OG) FOR AN OPEN BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR 
    • Measure the resistance between RCM C310b pin 19, circuit 617 (VT/OG), harness side and front impact severity sensor C177 pin 1, circuit 617 (VT/OG), harness side.
      Fig 4: Measuring Resistance Between RCM Pin 19 And Front Impact Severity Sensor Pin 1
      G03891319Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    • Yes  : GO to U8.
    • No  : REPAIR circuit 617 (VT/OG). GO to  U13.
  8. U8 CHECK CIRCUIT 618 (VT/LG) FOR AN OPEN BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR 
    • Measure the resistance between RCM C310b pin 20, circuit 618 (VT/LG), harness side and front impact severity sensor C177 pin 2, circuit 618 (VT/LG), harness side.
      Fig 5: Measuring Resistance Between Pin 20 And Front Impact Severity Sensor Pin 2
      G03891320Courtesy of FORD MOTOR CO.
    • Is the resistance less than 0.5 ohm? 
    • Yes  : GO to U9.
    • No  : REPAIR circuit 618 (PK/LG). GO to  U13.
  9. U9 CHECK CIRCUIT 617 (VT/OG) FOR A SHORT TO CIRCUIT 618 (VT/LG) BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR 
    • Measure the resistance between C177 pin 1 circuit 617 (VT/OG), harness side and C177 pin 2, circuit 618 (VT/LG), harness side.
      Fig 6: Measuring Resistance Between Pins 1 And 2
      G03891321Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to U10.
    • No  : REPAIR circuits 617 (VT/OG) and circuit 618 (VT/LG). GO to  U13.
  10. U10 CHECK THE FRONT IMPACT SEVERITY SENSOR 
    • Yes  : INSTALL the original front impact severity sensor. GO to U11.
    • No  : Fault corrected. GO to  U13.
  11. U11 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connectors are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    • Key in ON position.
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC B2227 retrieved during the on-demand self test? 
    • Yes  : INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) . GO to  U13.
    • No  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. REPAIR any intermittent concerns found. GO to  U13.
  12. U12 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
    • Was DTC B2227 retrieved during the on-demand self test? 
    • Yes  : This is a hard fault. The fault condition is now present. The fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. GO to  U2.
    • No  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. REPAIR any intermittent concerns found. GO to U13.
  13. U13 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous DTCs recorded during Step  U1.
    • Were any continuous DTCs retrieved during Step   U1 ? 
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