BMW X3 2005

Starter

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Removal & Installation




NOTE
When the battery is disconnected, the radio code, on-board computer and clock settings will be lost. The radio code should be obtained before disconnecting the battery or radio. Once the battery has been reconnected, the radio will not function unless the code is keyed in.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. If needed, read the stored fault memories from the control module.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Set the ignition switch to the OFF position.
  8.  
  9. Remove or disconnect the following:

    Negative battery cable
     
    Pressure accumulator
     
    Positive battery cable from the starter
     
    Starter electrical connectors
     
    Starter from the transmission mount
     
    Control leads
     
    Starter

    Click image to see an enlarged view

    Fig. Showing control lead, nuts and starter

     

  10.  

To install:

  1. Check starter pinion and starter ring gear for damage
  2.  
  3. Install or connect the following:

    Starter to transmission mount
     
    Control leads
     
    Starter electrical connectors
     
    Positive battery cable to the starter
     
    Pressure accumulator
     
    Negative battery cable
     

  4.  

Testing & Troubleshooting



The starting system includes the battery, starter motor, solenoid switch, ignition switch, inhibitor switch (A/T only), connection wires and the battery cables. When the ignition key is turned to the start position, current flows and energizes the starter motor solenoid coil. The solenoid plunger and clutch shift lever are activated, and the clutch pinion engages the ring gear. The contacts close and the starter motor cranks the engine. In order to prevent damage caused by excessive rotation of the starter armature when the engine starts, the clutch pinion gear overruns.

The starter should crank the engine smoothly and steadily. If the starter engages, but cranks the engine erratically, remove it, and inspect the starter drive gear and torque converter ring gear for damage. Check the drive gear overrunning clutch for binding or slipping when the armature is rotated with the drive gear held in place. If damaged, replace the starter drive.

If the starter is not turning over the engine, check that the wire connections are fastened securely to the starter solenoid and that battery voltage (12 volts) is supplied to the starter.

The starter should have power supplied to it at all times. With the ignition in the START position, power is supplied from the ignition switch terminal to activate the solenoid. The starter motor plunger closes and provides a closed circuit between the battery and the starter motor. The starter motor is grounded to the cylinder block. With both power and ground supplied, a functioning starter motor operates correctly and turns the engine over at the proper speed.

 
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