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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2072 (Anti-Theft System - Pats - (Hybrid)) >> Diagnostic Tests >> Anti-Theft - Passive Anti-Theft System (PATS) >> Pinpoint Tests >> Pinpoint Test G: DTC B1681 - Passive Anti-Theft System (PATS) Transceiver Signal Is Not Received (Not Connected, Damaged, Or Damaged Wiring) >> Pinpoint Test G: DTC B1681 - Passive Anti-Theft System (Pats) Transceiver Signal Is Not Received (Not Connected, Damaged, Or Damaged Wiring)

Pinpoint Test G: DTC B1681 - Passive Anti-Theft System (Pats) Transceiver Signal Is Not Received (Not Connected, Damaged, Or Damaged Wiring)

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. G1 USE THE DTCs FROM THE PCM SELF-TEST 
    • Use the recorded PCM continuous and on-demand self-test DTCs.
    • Is DTC B1681 retrieved? 
    1. YES  : Go to  G2.
    2. NO  : The system is OK.
  2. G2 INSPECT THE PATS TRANSCEIVER FOR CORRECT INSTALLATION 
    1. YES  : Go to  G3.
    2. NO  : CORRECT the installation. CLEAR the DTCs. REPEAT the self-test.
  3. G3 CHECK THE PATS TRANSCEIVER CIRCUIT 296 (WH/VT) FOR VOLTAGE 
    • Key in the OFF position for a minimum of 3 seconds.
    • Disconnect: PATS Transceiver C2007
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0026070Courtesy of FORD MOTOR CO.
    • Measure the voltage between the PATS transceiver C2007-1, circuit 296 (WH/VT), harness side and ground.
    • Is the voltage greater than 9 volts? 
    1. YES  : Go to  G4.
    2. NO  : VERIFY that smart junction box (SJB) fuse 5 (2A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. G4 CHECK THE PATS TRANSCEIVER GROUND CIRCUIT 570 (BK/WH) 
    • Key in the OFF position for a minimum of 3 seconds.
      • Fig 2: Checking Circuit For Open
      GF0026071Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-2, circuit 570 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. G5 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 168 (RD/BK) FOR VOLTAGE 
    • Connect: PATS Transceiver C2007
    • Key in ON position.
      • Fig 3: Checking Circuit For Voltage
      GF0026072Courtesy of FORD MOTOR CO.
    • Measure the voltage by back-probing between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground.
    • Is the voltage greater than 9 volts? 
    1. YES  : Go to  G8.
    2. NO  : Go to  G6.
  6. G6 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 168 (RD/BK) FOR A SHORT TO GROUND 
    • Key in the OFF position for a minimum of 3 seconds.
    • Disconnect: PATS Transceiver C2007
      • Fig 4: Checking Circuit For Short To Ground
      GF0026073Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground.
    • Is the resistance greater than 100 ohms? 
    1. YES  : Go to  G8.
    2. NO  : Go to  G7.
  7. G7 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 168 (RD/BK) FOR A SHORT TO GROUND WITH THE PCM DISCONNECTED 
    • Key in the OFF position for a minimum of 3 seconds.
    • Disconnect: PCM C175b
      • Fig 5: Checking Circuit For Short To Ground
      GF0026073Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground.
    • Is the resistance greater than 100 ohms? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - HYBRID article. PROGRAM the keys. REFER to Key Programming Using Diagnostic Equipment . CARRY OUT the parameter reset procedure, REFER to Passive Anti-Theft System (PATS) Parameter Reset . CLEAR the DTCs. TEST the system for normal operation.
    2. NO  : REPAIR circuit 168 (RD/BK). CLEAR the DTCs. REPEAT the self-test. If the vehicle is equipped with the valet feature, PROGRAM the third key (if available) or INSTRUCT the customer on how to CARRY OUT this procedure. REFER to Key Programming Using Two Programmed Keys .
  8. G8 CHECK CIRCUIT 168 (RD/BK) FOR AN OPEN 
    • Key in the OFF position for a minimum of 3 seconds.
    • Disconnect: PATS Transceiver C2007
    • Disconnect: PCM C175b
      • Fig 6: Checking Circuit For Open
      GF0026074Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and the PCM C175b-42, circuit 168 (RD/BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G9.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  9. G9 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR VOLTAGE  
    • Key in the OFF position for a minimum of 3 seconds.
    • Connect: PATS Transceiver C2007
    • Connect: PCM C175b
    • Key in ON position.
      • Fig 7: Checking Circuit For Voltage
      GF0026075Courtesy of FORD MOTOR CO.
    • Measure the voltage by back-probing between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground.
    • Is the voltage greater than 9 volts? 
    1. YES  : Go to  G12.
    2. NO  : Go to  G10.
  10. G10 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR A SHORT TO GROUND 
    • Key in the OFF position for a minimum of 3 seconds.
    • Disconnect: PCM C175b
      • Fig 8: Checking Circuit For Short To Ground
      GF0026076Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground.
    • Is the resistance greater than 100 ohms? 
    1. YES  : Go to  G12.
    2. NO  : Go to  G11.
  11. G11 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR A SHORT TO GROUND WITH THE PCM DISCONNECTED 
    • Key in the OFF position for a minimum of 3 seconds.
    • Disconnect: PCM C175b
      • Fig 9: Checking Circuit For Short To Ground
      GF0026076Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground.
    • Is the resistance greater than 100 ohms? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - HYBRID article. PROGRAM the keys. REFER to Key Programming Using Diagnostic Equipment . CARRY OUT the parameter reset procedure, REFER to Passive Anti-Theft System (PATS) Parameter Reset . TEST the system for normal operation. If the vehicle is equipped with the valet feature, PROGRAM the third key (if available) or INSTRUCT the customer on how to CARRY OUT this procedure. REFER to Key Programming Using Two Programmed Keys .
    2. NO  : REPAIR circuit 167 (BN/OG). CLEAR the DTCs. REPEAT the self-test.
  12. G12 CHECK THE PATS TRANSMIT CIRCUIT 167 (BN/OG) FOR CORRECT OPERATION 
    • Connect: PATS Transceiver C2007
      • Fig 10: Checking Circuit Operation
      GF0026075Courtesy of FORD MOTOR CO.
    • Trigger the PCM active command RF_ SIGNAL to ON while measuring the voltage by back probing between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground.
    • Does the voltage drop from greater than 9 volts to less than 1 volt when the PCM active command RF_ SIGNAL is triggered ON? 
    1. YES  : Go to  G14.
    2. NO  : Go to  G13.
  13. G13 CHECK THE PATS TRANSMIT CIRCUIT 167 (BN/OG) FOR AN OPEN 
    • Connect: PATS Transceiver C2007
      • Fig 11: Checking Circuit For Open
      GF0026077Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and the PCM C175b-31, circuit 167 (BN/OG), harness side.
    • Is the resistance less than 5 Ohms? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - HYBRID article. PROGRAM the keys. REFER to Key Programming Using Diagnostic Equipment . REFER to Passive Anti-Theft System (PATS) Parameter Reset . TEST the system for normal operation. If the vehicle is equipped with the valet feature, PROGRAM the third key (if available) or instruct the customer on how to CARRY OUT this procedure. REFER to Key Programming Using Two Programmed Keys .
    2. NO  : REPAIR circuit 167 (BN/OG). CLEAR the DTCs. REPEAT the self-test.
  14. G14 CHECK THE PATS SYSTEM WITH A NEW PATS TRANSCEIVER INSTALLED 
    1. YES  : Go to  G15.
    2. NO  : The system is OK.
  15. G15 CHECK THE PATS SYSTEM WITH A NEW PCM 
    1. YES  : REPAIR circuits 296 (WH/VT), 570 (BK/WH), 167 (BN/OG), and 168 (RD/BK). CLEAR the DTCs. REPEAT the self-test.
    2. NO  : If no DTCs are retrieved, the system is OK.
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