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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Starting System (Diesel)) >> Diagnosis And Testing >> Starting System >> Pinpoint Tests >> Pinpoint Test A: The Engine Does Not Crank >> Pinpoint Test A: The Engine Does Not Crank

Pinpoint Test A: The Engine Does Not Crank

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  1. A1 PERFORM INSPECTION AND VERIFICATION 
    NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
    NOTE: If it is necessary to leave the battery charger connected during testing, do not leave it on its highest or boost setting. The highest settings can exceed 16 volts, resulting in false test results and setting of DTCs.
    • Yes  : Correct the cause as necessary.
    • No  : GO to A2
  2. A2 CHECK FOR ANY MESSAGES IN THE MESSAGE CENTER 
    • Check the message center while holding the ignition key in the start position.
    • Is STARTING SYSTEM FAULT displayed in the message center? 
  3. A3 Check BCM IGN_SW_STATE PID 
    • Using a diagnostic scan tool, view the BCM PIDs.
    • Monitor the BCM PID IGN_SW_STATE while turning the ignition switch from OFF to START.
    • Does the PID change from Off to Start when the ignition switch is turned from OFF to START? 
  4. A4 CHECK THE BCM AND PCM FOR DTCs 
    • Using the DTCs retrieved during Inspection and Verification, check for BCM and PCM DTCs.
    • Were any BCM and PCM DTCs retrieved? 
  5. A5 CHECK THE TCM TRANSMISSION RANGE (TR) SENSOR PID 
    • Using a diagnostic scan tool, view PCM PIDs.
    • While observing the TR PID, place the vehicle in PARK and NEUTRAL.
    • Does the PID match the gear selection? 
  6. A6 CHECK THE BATTERY GROUND CABLE 
    • Measure the voltage between the positive battery post and the battery ground cable connection at the engine.
      Fig 1: Checking Battery Ground Cable
      G06064156Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to A7.
    • No  : INSTALL a new battery ground cable. REFER to BATTERY, MOUNTING AND CABLES . TEST the system for normal operation.
  7. A7 CHECK THE STARTER MOTOR GROUND 
    • Measure the voltage between the positive battery post and the starter motor case.
      Fig 2: Checking Starter Motor Ground
      G06064158Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to A8.
    • No  : CLEAN the starter motor mounting flange and make sure the starter motor is correctly mounted. TEST the system for normal operation.
  8. A8 CHECK VOLTAGE TO THE STARTER MOTOR 
    • Measure the voltage between starter motor C197C-1, circuit SDC02 (RD) and ground.
      Fig 3: Measuring Voltage Between Starter Motor C197-1, Circuit SDC02 (RD) And Ground
      G06096680Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to A9.
    • No  : INSTALL a new positive battery cable. REFER to BATTERY, MOUNTING AND CABLES . TEST the system for normal operation.
  9. A9 CHECK THE STARTER MOTOR 
    • Connect one end of a fused jumper wire to starter motor solenoid C197D-1, circuit CDC25 (BN/GN). Momentarily connect the other end of the jumper to starter motor C197C-1, circuit SDC02 (RD).
      Fig 4: Checking Starter Motor
      G06126975Courtesy of FORD MOTOR CO.
    • Did the starter motor engage and the engine crank? 
    • Yes  : GO to A10.
    • No  : INSTALL a new starter motor. REFER to STARTER MOTOR . TEST the system for normal operation.
  10. A10 CHECK FOR START INPUT AT THE STARTER 
    • Disconnect: Starter Solenoid C197D.
    • Measure the voltage between the starter motor solenoid C197D-1, circuit CDC25 (BN/GN) and ground, while holding the key in the START position.
      Fig 5: Measuring Voltage Between Starter Motor Solenoid C197D-1, Circuit CDC25 (BN/GN) And Ground
      G06126976Courtesy of FORD MOTOR CO.
    • Is the voltage reading greater than 11 volts? 
    • Yes  : CLEAN the starter motor solenoid S-terminal and connector. CHECK the wiring and the starter motor for a loose or intermittent connection. TEST the system for normal operation.
    • No  : GO to A11.
  11. A11 CHECK THE INPUT CIRCUIT TO THE STARTER MOTOR SOLENOID FOR AN OPEN 
    NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
    • Ignition OFF.
    • Disconnect: Starter Motor Relay.
    • Measure the resistance between starter motor C197D-1, circuit CDC25 (BN/GN) and Battery Junction Box (BJB) starter relay socket pin 5, circuit CDC25 (BN/GN).
      Fig 6: Measuring Resistance Between Starter Motor C197D-1, Circuit CDC25 (BN/GN) And Battery Junction Box (BJB) Starter Relay Socket Pin 5
      G07481872Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to A12.
    • No  : REPAIR the circuit CDC25 (BN/GN). TEST the system for normal operation.
  12. A12 CHECK THE VOLTAGE SUPPLY TO THE STARTER RELAY 
    • Ignition OFF.
    • Measure the voltage between BJB starter motor relay socket pin 3, circuit SBB89 (RD) and ground.
      Fig 7: Measuring Voltage Between BJB Starter Relay Socket Pin 3, Circuit SSB89 (RD) And Ground
      G07481873Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to A13.
    • No  : VERIFY BJB fuse 89 (40A) is OK. If OK, REPAIR circuit SBB89 (RD) for an open. TEST the system for normal operation. If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short.
  13. A13 CHECK THE STARTER MOTOR REQUEST SIGNAL CIRCUIT 
    • Measure the voltage between BJB starter motor relay socket pin 1, circuit CDC38 (WH/VT) and ground, while holding the key in the START position.
      Fig 8: Measuring Voltage Between BJB Starter Motor Relay Socket Pin 1, Circuit CDC38 (WH/VT) And Ground
      G07481874Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to A14.
    • No  : GO to  A16.
  14. A14 CHECK THE STARTER MOTOR CONTROL GROUND CIRCUIT 
    • Measure the voltage between BJB starter motor relay socket pin 2, circuit CDC12 (YE) and pin 1, circuit CDC38 (WH/VT), while holding the key in the START position.
      Fig 9: Measuring Voltage Between BJB Starter Relay Socket Pin 2, Circuit CDC12 (YE) And Pin 1, Circuit CDC38 (WH/VT)
      G07481875Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : INSTALL a new starter motor relay. TEST the system for normal operation.
    • No  : GO to A15.
  15. A15 CHECK THE STARTER MOTOR CONTROL CIRCUIT FOR AN OPEN 
    • Disconnect: PCM C1232B.
    • Measure the resistance between the starter motor relay pin 2, circuit CDC12 (YE) and PCM C1232B-7, circuit CDC12 (YE), harness side.
      Fig 10: Measuring Resistance Between Starter Motor Relay Pin 2, Circuit CDC12 (YE) And PCM C1232B-7
      G07481876Courtesy of FORD MOTOR CO.
    • Is the resistance reading 3 ohms? 
  16. A16 CHECK THE STARTER MOTOR REQUEST CIRCUIT FOR AN OPEN 
    • Disconnect: PCM C1232B.
    • Measure the resistance between the BJB starter relay socket pin 1, circuit CDC38 (WH/VT) and PCM C1232B-37, circuit CDC38 (WH/VT).
      Fig 11: Measuring Resistance Between BJB Starter Relay Socket Pin 1, Circuit CDC38 (WH/VT) And PCM C1232B-37
      G07481877Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to A17.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  17. A17 CHECK THE START CIRCUIT FOR VOLTAGE AT THE BCM 
    • Disconnect: BCM C2280B.
    • Measure the voltage between BCM C2280B-47, circuit CDC35 (BU/WH) and ground, while holding the key in the START position.
      Fig 12: Measuring Voltage Between BCM C2280B-47, Circuit CDC35 (BU/WH) And Ground
      G07481878Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
    • Yes  : GO to A18.
    • No  : GO to  A19.
  18. A18 CHECK THE START CIRCUIT FOR VOLTAGE AT THE PCM 
    • Disconnect: PCM C1232B.
    • Measure the voltage between PCM C1232B-16, circuit CDC35 (BU/WH) and ground, while holding the key in the START position.
      Fig 13: Measuring Voltage Between PCM C1232B-16, Circuit CDC35 (BU/WH) And Ground
      G07481879Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 volts? 
  19. A19 CHECK THE IGNITION SWITCH 
    • Carry out the Ignition Switch Component Test. Refer to appropriate "OEM Wiring Diagrams Component Testing" article for component testing.
    • Did the ignition switch pass the component test? 
    • Yes  : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.
    • No  : INSTALL a new ignition switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
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