Infiniti Car 1998-05

Alternator

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Diagnosis & Testing



Visually check the alternator wiring and listen for abnormal noises. Check that the wiring is in good condition. Check that there is no abnormal noise from the alternator while the engine is running.

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Fig. Alternator circuit diagram-G20 (2002 shown)



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Fig. Alternator circuit diagram-G35 coupe (2005 shown)



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Fig. Alternator circuit diagram-G35 2WD sedan (2005 shown)



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Fig. Alternator circuit diagram-G35 AWD sedan (2005 shown)



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Fig. Alternator circuit diagram-I30 (2001 shown)



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Fig. Alternator circuit diagram-I35 (2004 shown)



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Fig. Alternator circuit diagram-M45 (2004 shown)



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Fig. Alternator circuit diagram-Q45 (2005 shown)

Installation



2.0L Engine
  1. Install or connect the following:

    Alternator
     
    Alternator bracket, if removed
     
    Alternator retainers as shown in the accompanying illustration
     

  2.  


    Click image to see an enlarged view

    Fig. Alternator and bracket retainer locations and torque specifications-G20 models


  1. Install or connect the following:

    Alternator
     
    Alternator bracket, if removed
     
    Alternator retainers as shown in the accompanying illustration

    Click image to see an enlarged view

    Fig. Alternator and bracket retainer locations and torque specifications-G20 models

     

  2.  

3.0L Engine
  1. Install or connect the following:

    Alternator
     
    Upper and lower alternator bolts. Torque the upper bolt to 11-15 ft. lbs. (15-20 Nm) and the lower bolt to 32-38 ft. lbs. (44-52 Nm)
     
    Alternator harness connector
     

  2.  
  3. Slide the A/C compressor rearward.

    Fan shroud and cooling fan
     
    4 A/C compressor mounting bolts
     
    Drive belt
     

  4.  
  5. Tighten the belt idler pulley.

    Right-hand side inspection cover
     
    Engine right-hand undercover
     
    Negative battery cable
     

  6.  

  1. Install or connect the following:

    Alternator
     
    Upper and lower alternator bolts. Torque the upper bolt to 11-15 ft. lbs. (15-20 Nm) and the lower bolt to 32-38 ft. lbs. (44-52 Nm)
     
    Alternator harness connector
     

  2.  
  3. Slide the A/C compressor rearward.

    Fan shroud and cooling fan
     
    4 A/C compressor mounting bolts
     
    Drive belt
     

  4.  
  5. Tighten the belt idler pulley.

    Right-hand side inspection cover
     
    Engine right-hand undercover
     
    Negative battery cable
     

  6.  

3.5L Engine
  1. Install or connect the following:

    Alternator
     
    Upper and lower alternator bolts. Tighten the upper bolt to 12-15 ft. lbs. (16 -20 Nm) and the lower bolt to 32-38 ft. lbs. (44-52 Nm).
     
    Alternator and A/C compressor harness connectors
     
    Drive belt
     
    Radiator
     
    Right side engine undercover and side inspection cover
     
    Negative battery cable
     

  2.  

  1. Install or connect the following:

    Alternator into the vehicle
     
    Alternator bracket bolts and torque to 18-23 ft. lbs. (24-31 Nm)
     
    Upper and lower alternator mounting bolts and tighten to 45-51 ft. lbs. (60-70 Nm)
     
    B terminal mounting nut. Torque the nut to 83-95 inch lbs. (9-11 Nm).
     
    Oil pressure switch harness connector
     
    Alternator electrical connector
     
    Drive belts
     
    Stabilizer into position and secure with the clamps
     
    Engine undercover
     
    Negative battery cable
     

  2.  

4.1L Engine
  1. Install or connect the following:

    Alternator
     
    Alternator bolts. Torque the alternator bolts marked12
     


    Click image to see an enlarged view

    Fig. Alternator bolt locations-4.1L Q45 models

    Alternator electrical connector
     
    Engine drive belt
     
    Engine upper cover
     
    Negative battery cable
     

  2.  

  1. Install or connect the following:

    Alternator
     
    Alternator bolts. Torque the alternator bolts marked 1 , (shown in the accompanying illustration) to 30-38 ft. lbs. (41-52 Nm) and the bolt marked 2 , (shown in the same illustration) to 15-20 ft. Lbs. (21-26 Nm)

    Click image to see an enlarged view

    Fig. Alternator bolt locations-Q45 models

     
    Alternator electrical connector
     
    Engine drive belt
     
    Engine upper cover
     
    Negative battery cable
     

  2.  

4.5L Engine
  1. Installation is the reverse of the removal procedure.
  2.  


    Click image to see an enlarged view

    Fig. Alternator mounting-4.5L engine


Removal



2.0L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Drive belt
     
    Alternator harness connector
     
    Alternator bracket, if necessary
     
    Alternator retainers
     
    Alternator
     

  4.  

3.0L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine right-hand undercover
     
    Right-hand side inspection cover
     

  4.  
  5. Loosen the belt idler pulley.

    Drive belt
     
    4 A/C compressor mounting bolts
     
    Cooling fan and fan shroud
     

  6.  
  7. Slide the A/C compressor forward.

    Alternator harness connector
     
    Upper and lower alternator bolts
     
    Alternator
     

  8.  

4.1L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine upper cover
     
    Engine drive belt
     
    Alternator electrical connector
     
    Alternator
     

  4.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Battery
     
    Air intake duct
     
    Engine drive belt
     
    Power steering hose clamp bolt
     
    Alternator stay
     
    Power steering reservoir tank
     
    Ground harness bolt
     
    Alternator electrical connector
     
    Alternator
     

  4.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Right side engine undercover and side inspection cover
     
    Radiator
     
    Drive belt
     
    Alternator and A/C compressor harness connectors
     
    Upper and lower alternator bolts
     
    Alternator
     

  4.  

To install:

  1. Installation is the reverse order of removal.

    Click image to see an enlarged view

    Fig. Alternator and bracket retainer locations and torque specifications-I35 models

  2.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Air intake duct
     
    Engine drive belt
     
    Power steering hose clamp bolt
     
    Alternator stay
     
    Radiator reservoir tank
     
    Ground harness bolt
     
    Engine compartment harness clip
     
    Alternator electrical connector
     
    Alternator
     

  4.  

To install:

  1. Installation is the reverse order of removal.

    Click image to see an enlarged view

    Fig. Alternator mounting and torque specifications-2004 M45, 2002-2004 Q45

  2.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine front undercover
     
    -B- terminal nut
     
    Alternator connector
     
    Alternator ground harness mounting bolt
     
    Harness bracket bolts
     
    Air intake duct
     
    Engine drive belts
     
    Power steering oil reservoir tank from bracket
     
    Engine coolant reservoir tank
     
    Vacuum tank
     
    Harness clips
     
    Alternator mounting bolts
     
    Alternator
     

  4.  

To install:

  1. Installation is the reverse order of removal.

    Click image to see an enlarged view

    Fig. Alternator mounting and torque specifications-Q45 (2005)

  2.  

2.0L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Drive belt
     
    Alternator harness connector
     
    Alternator bracket, if necessary
     
    Alternator retainers
     
    Alternator
     

  4.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Drive belt
     
    Alternator harness connector
     
    Alternator bracket, if necessary
     
    Alternator retainers
     
    Alternator
     

  4.  

To install:

  1. Install or connect the following:

    Alternator
     
    Alternator bracket, if removed
     
    Alternator retainers as shown in the accompanying illustration

    Click image to see an enlarged view

    Fig. Alternator and bracket retainer locations and torque specifications-G20 models

     

  2.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Drive belt
     
    Alternator harness connector
     
    Alternator bracket, if necessary
     
    Alternator retainers
     
    Alternator
     

  4.  

To install:

  1. Installation is the reverse order of removal.

    Click image to see an enlarged view

    Fig. Alternator and bracket retainer locations and torque specifications-G20 models

  2.  

3.0L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine right-hand undercover
     
    Right-hand side inspection cover
     

  4.  
  5. Loosen the belt idler pulley.

    Drive belt
     
    4 A/C compressor mounting bolts
     
    Cooling fan and fan shroud
     

  6.  
  7. Slide the A/C compressor forward.

    Alternator harness connector
     
    Upper and lower alternator bolts
     
    Alternator
     

  8.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine right-hand undercover
     
    Right-hand side inspection cover
     

  4.  
  5. Loosen the belt idler pulley.

    Drive belt
     
    4 A/C compressor mounting bolts
     
    Cooling fan and fan shroud
     

  6.  
  7. Slide the A/C compressor forward.

    Alternator harness connector
     
    Upper and lower alternator bolts
     
    Alternator
     

  8.  

To install:

  1. Install or connect the following:

    Alternator
     
    Upper and lower alternator bolts. Torque the upper bolt to 11-15 ft. lbs. (15-20 Nm) and the lower bolt to 32-38 ft. lbs. (44-52 Nm)
     
    Alternator harness connector
     

  2.  
  3. Slide the A/C compressor rearward.

    Fan shroud and cooling fan
     
    4 A/C compressor mounting bolts
     
    Drive belt
     

  4.  
  5. Tighten the belt idler pulley.

    Right-hand side inspection cover
     
    Engine right-hand undercover
     
    Negative battery cable
     

  6.  

3.5L Engines
Automatic Transmission
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine undercover
     
    Stabilizer bar clamps, then slide stabilizer downward
     
    Loosen drive belts
     
    Alternator electrical connector
     
    Oil pressure switch harness connector
     
    -B- terminal mounting nut
     
    Upper and lower alternator mounting bolt
     
    Both alternator bracket bolts
     
    Alternator from the vehicle
     

  4.  

To install:

  1. Installation is the reverse order of removal.
  2.  

AWD & Manual Transmission
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine undercover
     
    Radiator fan assembly
     
    Remove drive belts
     
    Oil pressure switch harness connector
     
    Alternator stay mounting bolts and stay
     
    Alternator mounting bolt
     
    Alternator electrical connector
     
    -B- terminal mounting nut
     
    Harness clip and water hose bracket
     
    Alternator from the vehicle
     

  4.  

To install:

  1. Installation is the reverse order of removal.

    Click image to see an enlarged view

    Fig. Alternator mounting and torque specifications-G35 and M35 models

  2.  

4.1L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine upper cover
     
    Engine drive belt
     
    Alternator electrical connector
     
    Alternator
     

  4.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine upper cover
     
    Engine drive belt
     
    Alternator electrical connector
     
    Alternator
     

  4.  

To install:

  1. Install or connect the following:

    Alternator
     
    Alternator bolts. Torque the alternator bolts marked 1 , (shown in the accompanying illustration) to 30-38 ft. lbs. (41-52 Nm) and the bolt marked 2 , (shown in the same illustration) to 15-20 ft. Lbs. (21-26 Nm)

    Click image to see an enlarged view

    Fig. Alternator bolt locations-Q45 models

     
    Alternator electrical connector
     
    Engine drive belt
     
    Engine upper cover
     
    Negative battery cable
     

  2.  

 
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