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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 862 (Starting System - F-150 & Mark LT) >> Diagnostic Tests >> Starting System >> Pinpoint Tests >> Pinpoint Test B: The Engine Does Not Crank and the Relay Does Not Click (Early Build Vehicles) >> Pinpoint Test B: The Engine Does Not Crank And The Relay Does Not Click (Early Build Vehicles)

Pinpoint Test B: The Engine Does Not Crank And The Relay Does Not Click (Early Build Vehicles)

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK THE BATTERY 
    1. YES  : Go to  B2.
    2. NO  : CHARGE or INSTALL a new battery as required. TEST the system for normal operation.
  2. B2 CHECK CIRCUIT 1093 (TN/RD) FOR VOLTAGE 
    • Disconnect: Starter Motor Relay
    • Key in START position.
    • Measure the voltage between starter motor relay pin 86, circuit 1093 (TN/RD) and ground while holding the key in the START position.
      Fig 1: Checking Circuit 1093 (TN/RD) For Voltage
      GF0002864Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B8.
    2. NO  : Vehicles equipped with an automatic transmission, go to  B3. Vehicles equipped with a manual transmission, go to  B6.
  3. B3 CHECK CIRCUIT 325 (DB/OG) FOR VOLTAGE AT THE DIGITAL TR SENSOR 
    • Key in OFF position.
    • Disconnect: Digital TR Sensor C167
    • Key in START position.
    • Measure the voltage between digital TR sensor C167-10, circuit 325 (DB/OG) and ground while holding the key in the START position.
      Fig 2: Checking Circuit 325 (DB/OG) For Voltage At Digital TR Sensor
      GF0002865Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B4.
    2. NO  : Go to  B8.
  4. B4 CHECK CIRCUIT 1093 (TN/RD) FOR AN OPEN 
    • Measure the resistance between digital TR sensor C167-12, circuit 1093 (TN/RD) and starter motor relay pin 86, circuit 1093 (TN/RD).
      Fig 3: Checking Circuit 1093 (TN/RD) For Open
      GF0002866Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B5.
    2. NO  : REPAIR circuit 1093 (TN/RD). TEST the system for normal operation.
  5. B5 CHECK THE DIGITAL TR SENSOR ADJUSTMENT 
    1. YES  : INSTALL a new digital TR sensor. TEST the system for normal operation.
    2. NO  : ADJUST the digital TR sensor as necessary. TEST the system for normal operation.
  6. B6 CHECK CIRCUIT 325 (DB/OG) 
    • Key in OFF position.
    • Disconnect: In-Line Harness C110
    • Key in START position.
    • Measure the voltage between in-line harness C110-1, female side, circuit 325 (DB/OG) and ground while holding the key in the START position.
      Fig 4: Checking Circuit 325 (DB/OG)
      GF0002867Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B7.
    2. NO  : Go to  B8.
  7. B7 CHECK CIRCUIT 1093 (TN/RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Starter Motor Relay
    • Measure the resistance between in-line C110-12, female side, circuit 1093 (TN/RD) and starter motor relay pin 86, circuit 1093 (TN/RD).
      Fig 5: Checking Circuit 1093 (TN/RD) For Open
      GF0002868Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new 15525 transmission wiring harness. TEST the system for normal operation.
    2. NO  : REPAIR circuit 1093 (TN/RD). TEST the system for normal operation.
  8. B8 CHECK CIRCUIT 1050 (LG/VT) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Ignition Switch C250
    • Measure the voltage between ignition switch C250-4, circuit 1050 (LG/VT) and ground.
      Fig 6: Checking Circuit 1050 (LG/VT) For Voltage
      GF0002869Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B9.
    2. NO  : REPAIR circuit 1050 (LG/VT). TEST the system for normal operation.
  9. B9 CHECK DIGITAL TR SENSOR ADJUSTMENT  
    1. YES  : Go to  B10.
    2. NO  : ADJUST the digital TR or TR sensor as necessary. TEST the system for normal operation.
  10. B10 CHECK THE STARTER MOTOR RELAY GROUND CIRCUIT FOR AN OPEN 
    • Key in START position.
    • Measure the voltage between starter motor relay pin 85, circuit 1785 (LG/VT) and pin 86, circuit 1093 (TN/RD) with the clutch pedal depressed, if equipped.
      Fig 7: Checking Starter Motor Relay Ground Circuit For Open
      GF0002870Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new starter motor relay. TEST the system for normal operation.
    2. NO  : Go to  B11.
  11. B11 CHECK CIRCUIT 1785 (LG/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: PCM C175B
    • Measure the resistance between PCM C175B-34, circuit 1785 (LG/VT) and starter motor relay pin 85, circuit 1785 (LG/VT).
      Fig 8: Checking Circuit 1785 (LG/VT) For Open
      GF0002871Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms?  
    1. YES  : Vehicles equipped with a manual transmission, go to  B12. Vehicles equipped with an automatic transmission, go to  B15.
    2. NO  : REPAIR circuit 1785 (LG/VT). TEST the system for normal operation.
  12. B12 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH BOTTOM OF TRAVEL INPUT TO THE PCM 
    • Key in OFF position.
    • Disconnect: PCM C175B
    • Fully depress the clutch pedal.
    • Measure the resistance between PCM C175B-39, circuit 1903 (WH/BK) and C175B-67, - 68, - 69 or-70, circuit 570 (BK/WH).
      Fig 9: Checking Clutch Pedal Position (CPP) Switch Bottom Of Travel Input To PCM
      GF0002872Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B15.
    2. NO  : Go to  B13.
  13. B13 CHECK CIRCUIT 1903 (WH/BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CPP Switch C257
    • Measure the resistance between PCM C175B-39, circuit 1903 (WH/BK) and CPP switch C257-1, circuit 1903 (WH/BK).
      Fig 10: Checking Circuit 1903 (WH/BK) For Open
      GF0002873Courtesy of FORD MOTOR CO.
    • Is the resistance less than 2 ohms? 
    1. YES  : Go to  B14.
    2. NO  : REPAIR circuit 1903 (WH/BK). TEST the system for normal operation.
  14. B14 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Measure the resistance between PCM C175B-67, -68, -69 or -70, circuit 570 (BK/WH) and CPP switch C257-2, circuit 570 (BK/WH).
      Fig 11: Checking Circuit 570 (BK/WH) For Open
      GF0002874Courtesy of FORD MOTOR CO.
    • Is the resistance less than 2 ohms? 
    1. YES  : INSTALL a new CPP switch. REFER to ELECTRONIC ENGINE CONTROLS article. TEST the system for normal operation.
    2. NO  : REPAIR circuit 570 (BK/WH). TEST the system for normal operation.
  15. B15 CHECK THE PASSIVE ANTI-THEFT SYSTEM (PATS) 
    • Carry out the Passive Anti-Theft System (PATS) Diagnostic Routine. Refer to ANTI-THEFT article.
    • Is the PATS system OK? 
    1. YES  : DIAGNOSE the PCM. REFER to the INTRODUCTION - GASOLINE ENGINES article.
    2. NO  : REPAIR the PATS system. REFER to ANTI-THEFT article. TEST the system for normal operation.
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