Mazda B-Series 1998-06

Ignition Coils

Print

Removal & Installation



All engines, except the 2.3L and 2.5L engines, utilize one coil pack containing three separate coils. The 2.3L and 2.5L engines use two coil packs containing two separate coils each.

  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the electrical harness connector from the ignition coil pack.
  4.  
  5. On the 3.0L engine, loosen the mounting nut and remove the EGR vacuum regulator from the ignition coil.
  6.  



Click image to see an enlarged view

Fig. Ignition coil pack assembly-2.3L and 2.5L engines



Click image to see an enlarged view

Fig. Ignition coil pack assembly-3.0L engine



Click image to see an enlarged view

Fig. Ignition coil pack assembly-4.0L engine

  1. Label and remove the spark plug wires from the ignition coil terminal towers by squeezing the locking tabs to release the coil boot retainers.
  2.  
  3. Remove the coil pack mounting screws and remove the coil pack.
  4.  

To install:

  1. Install the coil pack and the retaining screws. On 2.3L, 2.5L and 4.0L engines, tighten the retaining screws to 44-62 inch lbs. (5-7 Nm). On the 3.0L engine, tighten the retaining screws to 12-14 ft. lbs. (16-20 Nm).
  2.  

Be sure to place some dielectric compound into each spark plug boot prior to installation of the spark plug wire.

  1. On the 3.0L engine, install the EGR vacuum regulator to the ignition coil and tighten the mounting nuts to 6-8 ft. lbs. (8-12 Nm).
  2.  
  3. Attach the spark plug wires and electrical harness connector to the coil pack.
  4.  
  5. Connect the negative battery cable.
  6.  

  1. Remove or disconnect the following:
    CAUTION
    Correct installation of the ignition wires is critical to engine operation. If one spark plug wire is not correctly installed at either the spark plugs or the ignition coil, both spark plugs connected to the ignition coil may not fire under load.



    Negative battery cable.
     
    Ignition wires
     
    Ignition coil electrical connectors
     
    Remove the bolts and remove the ignition coil.
     



    To install, reverse the removal procedure.
     

  2.  

Testing



2.3L & 2.5L Engine


B+ to Coil 1
 
B+ to Coil 2
 

or,



B+ to Coil 3
 
B+ to Coil 4
 



Click image to see an enlarged view

Fig. Engine ignition coil harness connections-3.0L and 4.0L engines



Click image to see an enlarged view

Fig. Engine ignition coil harness connections-2.3L and 2.5L engines

The resistance between all of these terminals should have been between 0.3-1.0 ohms. If the resistance was more or less than this value, the coil should be replaced with a new one.

Secondary Resistance
  1. Measure, using the ohmmeter, and note the resistance between each corresponding coil terminal and the two spark plug wire towers on the ignition coil. The coil terminals and plug wires towers are grouped as follows:
  2.  

Except 2.3L and 2.5L engines:



Terminal 3 (coil 1)-spark plugs 1 and 5
 
Terminal 2 (coil 3)-spark plugs 2 and 6
 
Terminal 1 (coil 2)-spark plugs 3 and 4
 

2.3L and 2.5L engines (right-hand coil pack):



Terminal 1 (coil 2)-spark plugs 2 and 3
 
Terminal 3 (coil 1)-spark plugs 1 and 4
 

2.3L and 2.5L engines (left-hand coil pack):



Terminal 1 (coil 4)-spark plugs 2 and 3
 
Terminal 3 (coil 3)-spark plugs 1 and 4
 

If the resistance for all of the readings was between 6,500-11,500 ohms, the ignition coils are OK. If any of the readings was less than 6,500 ohms or more than 11,500 ohms, replace the corresponding coil pack.

On 2.3L/2.5L engines, if one coil pack is found to be defective, the other pack does not need to be replaced.

Except 2.3L & 2.5L Engine


B+ to Coil 1
 
B+ to Coil 2
 
B+ to Coil 3
 

Primary & Secondary Circuit Tests
  1. Turn the ignition switch OFF , disconnect the battery, then detach the wiring harness connector from the ignition coil to be tested.
  2.  
  3. Check for dirt, corrosion or damage on the terminals.
  4.  

Primary Resistance Check
  1. Use an ohmmeter to measure the resistance between the following terminals on the ignition coil, and note the resistance:
  2.  

 
label.common.footer.alt.autozoneLogo