Pinpoint Test AF: The RKE Transmitter Is Inoperative

NOTE: Aftermarket or dealer-installed systems may adversely affect the RKE system operation. Disconnect these systems before diagnosing any RKE concerns.

AF1 CHECK FOR THE CORRECT IA KEYS
NOTE: Make sure the IA keys are those provided with the OEM system and not from an aftermarket system, or a dealer-installed system that may have been installed on the vehicle.
- Check that the correct IA keys are used with the vehicle. Compare the IA keys with the one shown in HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS in the Description and Operation portion of this service information.
- Are all the correct IA keys present?
- Yes: GO to AF2 .
- No: The system cannot be tested without the correct IA keys. INFORM the customer that all the correct IA keys must be present to proceed with diagnosis of the system.
AF2 CHECK THE RKE OPERATION WHEN THE TPM MODULE IS IN AN AWAKE MODE
- Open and close the driver door.
- Press any button on the IA key.
- Does the RKE feature operate?
- Yes: GO to AF3 .
- No: GO to AF4.
AF3 CHECK THE RKE OPERATION WHEN THE TPM MODULE IS IN A SLEEP MODE
- Ignition OFF.
- Let the vehicle sit for 10 minutes to allow the vehicle modules to go into a sleep mode.
- Press any button on the IA key.
- Does the RKE feature operate?
- Yes: The system is operating correctly at this time.
- No: GO to AF13.
AF4 CHECK THE RECORDED RFA MODULE DTCs FROM THE SELFTEST
- Check the recorded results from the RFA module self-test.
- Are any DTCs recorded?
- Yes: For DTC B10AB:06, GO to AF5 .
  For DTC U201F:31, GO to AF10.
- No: GO to AF8.
AF5 RESYNCHRONIZE THE INOPERATIVE IA KEY
- Ignition OFF.
- Press any button on the inoperative IA key 4 times consecutively within 30 seconds.
- Does the IA key operate correctly now?
- Yes: The system is OK. CLEAR the DTCs. REPEAT the self-test.
- No: GO to AF6 .
AF6 CHECK FOR A SECOND IA KEY
- Check for another IA key that operates with the vehicle.
- Is there another IA key that operates with the vehicle?
- Yes: GO to AF7 .
- No: PROGRAM a second key. REFER to the key programming procedures in ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) .
AF7 RESYNCHRONIZE THE INOPERATIVE IA KEY USING THE SECOND IA KEY
- Ignition OFF.
- Press any button on the operational IA key.
- Within 30 seconds, press a button on the inoperative IA key.
- Check the inoperative IA key for correct operation.
- Does the inoperative IA key operate now?
- Yes: The system is OK. CLEAR the DTCs. REPEAT the self-test.
- No: GO to AF8 .
AF8 CHECK THE IA KEY
- Place the IA key in the backup pocket.
- Start the engine.
- Does the engine start?
- Yes: GO to AF9 .
- No: REFER to ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) to continue diagnosis of the IA key.
AF9 CHECK THE IA KEY BATTERY
- Using a thin coin, open the IA key.
- Do not clean off any grease from the battery terminals on the back surface of the circuit board.
- Verify the correct battery is used (CR2032).
- Remove the IA key battery and measure the voltage.
- Is the voltage greater than 2.5 volts?
- Yes: GO to AF10 .
- No: INSTALL a new battery (be sure the battery is seated correctly). DO NOT reprogram the IA key (damaged or dead batteries do not erase IA keys from memory). TEST the system for normal operation.
AF10 CHECK FOR COMMUNICATION WITH THE TPM MODULE
- Enter the following diagnostic mode on the scan tool: Network Test.
- Does the TPM module pass the network test?
- Yes: GO to AF11 .
- No: REFER to MODULE COMMUNICATIONS NETWORK .
AF11 CHECK THE TPM MODULE COMMUNICATION CIRCUIT FOR A SHORT TO VOLTAGE
NOTE: The IA key has to be placed in the backup slot for this pinpoint test.
- Ignition OFF.
- Disconnect: TPM Module C4321.
- Disconnect: RFA Module C2153E.
- Ignition ON.
- Measure the voltage between the TPM module C4321-3, circuit VPL56 (BU/GY), harness side and ground.
  
  Fig 1: Identifying Measuring Voltage Between TPM Module And Ground Connector
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- No: GO to AF12 .
AF12 CHECK THE TPM MODULE COMMUNICATION CIRCUIT FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the TPM module C4321-3, circuit VPL56 (BU/GY), harness side and the RFA module C2153E-1, circuit VPL56 (BU/GY), harness side; and between the TPM module C4321- 3, circuit VPL56 (BU/GY), harness side and ground.
  
  Fig 2: Identifying Measuring Resistance Between TPM Module And RFA Module
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms between the TPM module and the RFA module; and greater than 10,000 ohms between the TPM module and ground?
- Yes: INSTALL a new TPM module. REFER to WHEELS & TIRES . CLEAR the DTCs. REPEAT the self-test. If the concern is still present, GO to AF14.
- No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
AF13 CHECK FOR CORRECT TPM MODULE OPERATION
- Disconnect the TPM module connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the TPM module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new TPM module. REFER to WHEELS & TIRES . TEST the system for normal operation.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
AF14 CHECK FOR CORRECT RFA MODULE OPERATION
- Disconnect all the RFA module connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the RFA module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new RFA module. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.