Pinpoint Test E: DTC B10D9:87

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY DISCONNECT .

E1 CHECK THE PATS TRANSCEIVER POWER CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Disconnect: PATS Transceiver C252.
- Ignition ON.
- Measure the voltage between the PATS transceiver C252-1, circuit CBP36 (BU/BN), harness side and ground.
- Is the voltage greater than 10 volts?
Fig 1: Measuring Voltage Between PATS Transceiver C252-1, Circuit CBP36 (BU/BN), Harness Side & Ground
Courtesy of FORD MOTOR CO.
- Yes: GO to E2.
- No: VERIFY the SJB fuse 36 (5A) is OK. If OK, REPAIR the circuit for an open. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
E2 CHECK THE PATS TRANSCEIVER GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the PATS transceiver C252-2, circuit GD116 (BK/VT), harness side and ground.
- Is the resistance less than 5 ohms?
- Yes: CONNECT the negative battery cable. GO to E3.
- No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
E3 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT FOR VOLTAGE
NOTE: This pinpoint test step directs using a back-probe method. Use the special back-probe tool specified in the Special Tool(s) . Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.
- Connect: PATS Transceiver C252.
- Ignition ON.
- Measure the voltage by backprobing between the PATS transceiver C252-4, circuit VRT24 (YE/OG), harness side and ground.
- Is the voltage greater than 8 volts?
- Yes: GO to E6.
- No: GO to E4.
E4 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: IPC C220.
- Disconnect: PATS Transceiver C252.
- Measure the resistance between the PATS transceiver C252-4, circuit VRT24 (YE/OG), harness side and ground.
  
  Fig 4: Measuring Resistance Between PATS Transceiver C252-4, Circuit VRT24 (YE/OG) & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes: GO to E5.
- No: REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  If DTC B10D9:87 is retrieved again, GO to E12.
E5 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT FOR AN OPEN
- Measure the resistance between the PATS transceiver C252-4, circuit VRT24 (YE/OG), harness side and the IPC C220-11, circuit VRT24 (YE/OG), harness side.
  
  Fig 5: Checking PATS Transceiver Receive Circuit For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to E12.
- No: REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
- E6 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR VOLTAGE
  NOTE: This pinpoint test step directs using a back-probe method. Use the special back-probe tool specified in the tool list in this article. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.
  
  NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the IPC again.
  - Measure the voltage by backprobing between the PATS transceiver C252-3, circuit VRT23 (VT/GY), harness side and ground.
  - Is the voltage greater than 8 volts?
  - Yes: INSTALL a new PATS transceiver. REFER to Removal and Installation . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
    If DTC B10D9:87 is retrieved again, go to E12.
  - No: GO to E7.
- E7 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR A SHORT TO GROUND WITH THE PATS TRANSCEIVER CONNECTED
  - Ignition OFF.
  - Disconnect: IPC C220.
  - Measure the resistance between the IPC C220-10, circuit VRT23 (VT/GY), harness side and ground.
    
    Fig 7: Measuring Resistance Between IPC C220-10, Circuit VRT23 (VT/GY) & Ground
    Courtesy of FORD MOTOR CO.
  - Is the resistance greater than 10,000 ohms?
  - Yes: GO to E9.
  - No: GO to E8.
- E8 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR A SHORT TO GROUND WITH THE PATS TRANSCEIVER DISCONNECTED
  NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the IPC again.
  - Disconnect: PATS Transceiver C252.
  - Measure the resistance between the IPC C220-10, circuit VRT23 (VT/GY), harness side and ground.
  - Is the resistance greater than 10,000 ohms?
  - Yes: INSTALL a new PATS transceiver. REFER to Removal and Installation . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  - No: REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
- E9 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR AN OPEN
  - Disconnect: PATS Transceiver C252.
  - Measure the resistance between the PATS transceiver C252-3, circuit VRT23 (VT/GY), harness side and the IPC C220-10, circuit VRT23 (VT/GY), harness side.
  - Is the resistance less than 5 ohms?
  - Yes: GO to E10.
  - No: REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
- E10 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR VOLTAGE WHILE COMMANDED ON
  NOTE: This pinpoint test step directs using a back-probe method. Use the special back-probe tool specified in the Special Tool(s) . Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors and subsequent electrical faults.
  
  NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the IPC again.
  - Connect: PATS Transceiver C252.
  - Connect: IPC C220.
  - Connect the scan tool.
  - Ignition ON.
  - Enter the following diagnostic mode on the scan tool: IPC DataLogger.
  - Trigger the IPC active command TRANSMIT (this is the TX circuit ON/OFF) to ON.
  - Measure the voltage by backprobing between the PATS transceiver C252-3, circuit VRT23 (VT/GY), harness side and ground.
  - Is the voltage less than 5 volts?
  - Yes: INSTALL a new PATS transceiver. REFER to Removal and Installation . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  - No: GO to E11.
- E11 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT FOR A SHORT TO VOLTAGE
  - Ignition OFF.
  - Disconnect: IPC C220.
  - Disconnect: PATS Transceiver C252.
  - Ignition ON.
  - Measure the voltage between the PATS transceiver C252-3, circuit VRT23 (VT/GY), harness side and ground.
  - Is any voltage indicated?
  - Yes: REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  - No: GO to E12.
- E12 CHECK FOR CORRECT IPC OPERATION
  - Disconnect the IPC connector.
  - Check for:
    - corrosion
    - damaged pins
    - pushed-out pins
  - Connect the IPC 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 IPC . REFER to INSTALLATION . RESET the parameters in both the IPC and the PCM. REFER to PASSIVE ANTI-THEFT SYSTEM (PATS) PARAMETER RESET . PROGRAM the PATS keys into the new IPC . REFER to INTEGRATED KEYHEAD TRANSMITTER (IKT) KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT . CYCLE the ignition. REPEAT the self-test.
  - No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.