Mazda CX-9 Grand Touring. Manual - part 577

Fig. 9: Checking Continuity Between Commutator And Shaft 
Courtesy of MAZDA MOTORS CORP. 

3. Place the armature on V-blocks, and measure the runout using a dial indicator. 

Starter armature runout  

0.1 mm {0.004 in} max.  

Fig. 10: Measuring Runout With Dial Indicator 
Courtesy of MAZDA MOTORS CORP. 

4. Measure the commutator diameter. 



If not within the minimum specification, replace the armature.  

Starter commutator diameter  

Standard: 29.4 mm {1.16 in}  

Minimum: 28.8 mm {1.13 in}  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Starting System (MZI-3.7) - Mazda CX-9

  

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Fig. 11: Measuring Commutator Diameter 
Courtesy of MAZDA MOTORS CORP. 

5. Measure the segment groove depth of the commutator. 



If not within the minimum specification, undercut the grooves to the standard depth.  

Segment groove depth of starter commutator  

Standard: 0.5 mm {0.02 in}  

Minimum: 0.2 mm {0.008 in}  

Fig. 12: Measuring Segment Groove Depth Of Commutator 
Courtesy of MAZDA MOTORS CORP. 

Magnetic switch 

1. Inspect for continuity between terminals S and M using a tester. 



If there is no continuity, replace the magnetic switch. 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Starting System (MZI-3.7) - Mazda CX-9

  

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Fig. 13: Checking Continuity Between Terminals S And M 
Courtesy of MAZDA MOTORS CORP. 

2. Inspect for continuity between terminal S and the body using a tester. 



If there is no continuity, replace the magnetic switch. 

Fig. 14: Checking Continuity Between Terminal S And Body With Tester 
Courtesy of MAZDA MOTORS CORP. 

3. Verify that there is no continuity between terminals M and B using a tester. 



If there is continuity, replace the magnetic switch. 

Fig. 15: Checking Continuity Between Terminals M And B With Tester 
Courtesy of MAZDA MOTORS CORP.

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Starting System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

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Brush and brush holder 

1. Verify that there is no continuity between each insulated brush and plate using a tester. 



If there is continuity, replace the brush holder. 

Fig. 16: Checking Continuity Between Brush And Plate With Tester 
Courtesy of MAZDA MOTORS CORP. 

2. Measure the brush length. 



If any brush is worn almost to or beyond the minimum specification, replace all of the brushes.  

Starter brush length  

Standard: 12.3 mm {0.48 in}  

Minimum: 5.5 mm {0.22 in}  

Fig. 17: Identifying Brush Length 
Courtesy of MAZDA MOTORS CORP. 

3. Measure the brush spring force using a spring balance. 



If not within the minimum specification, replace the brush and brush holder component.  

Starter brush spring force  

Standard: 15.0-20.4 N {1.53-2.08 kgf, 3.38-4.58 lbf}

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Starting System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:56:47 AM

Page 9 

© 2005 Mitchell Repair Information Company, LLC.