Toyota 4Runner 2001-06

Ignition Coils

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Removal & Installation




NOTE
This procedure may vary depending on model year and chassis. The following should suffice for most all Toyota applications using these engines.



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Fig. Exploded view of the ignition coils, related components and mounting points-3.4L (5VZ-FE) Engine



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Fig. Ignition coils, related components and mounting points-4.7L (2UZ-FE) Engine

  1. Remove the air cleaner hose.
  2.  
  3. If equipped, tag for identification, then disconnect the high-tension (spark plug) cables from the ignition coils.
  4.  
  5. Unplug the connectors from the ignition coils.
  6.  
  7. On these engines, the coils mount to the left side cylinder head. Remove the three mounting bolts and remove the coils from the cylinder head
  8.  

To install:

  1. Install the coils in the reverse order of removal. Make certain the correct coil is replaced in the same place where it was removed. Tighten the mounting bolts to 69 inch lbs. (7.8 Nm).
  2.  
  3. Attach the plug wires to the coils.
  4.  
  5. Install the air cleaner hose.
  6.  
  7. Start the engine and check for proper operation.
  8.  

Testing



2uz-FE And 1gr-FE Engine

These engines have an electronic distributorless ignition system, with separate coils. Each spark plug has its own coil on top of the connector.

  1. If there is no spark at the spark plugs, check for power to the ignition coil, as follows:
    1. Turn the ignition switch to the ON position.
    2.  
    3. Check that there is battery voltage at the ignition coil positive ( + ) terminal.
    4.  

  2.  
  3. If there is battery voltage at the ignition coil positive ( + ) terminal, but no spark at the plugs, the Camshaft Position (CMP) sensor, Variable Valve Timing (VVT) sensor (if equipped) and Crankshaft Position (CKP) sensor should be checked. For additional information, please refer to the following topic(s): Driveability and Emission Controls.
  4.  

5VZ-FE Engine


Click image to see an enlarged view

Fig. View of the ignition coil assembly used on the 3.4L (5VZ-FE) Engine

The 3.4L (5VZ-FE) Engine has an electronic distributorless ignition system, with six separate coils, each with their own spark plug wire.

Click image to see an enlarged view

Fig. Checking the coil's primary circuit resistance (top) and secondary resistance (bottom)-3.4L (5VZ-FE) Engine

  1. If there is no spark at the spark plugs, check for power to the ignition coil, as follows:
    1. Turn the ignition switch to the ON position.
    2.  
    3. Check that there is battery voltage at the ignition coil positive ( + ) terminal.
    4.  

  2.  
  3. If there is battery voltage at the ignition coil positive ( + ) terminal, but no spark at the plugs, the coils should be checked.
  4.  
  5. Disconnect the high-tension (spark plug wires) cables and the smaller ignition harness connectors from the ignition coils.
  6.  
  7. Using an ohmmeter, measure the primary coil resistance between the positive ( + ) and negative ( - ) terminals. The reading should be:
    1. Cold: 0.67-1.05 ohms
    2.  
    3. Hot: 0.85-1.23 ohms
    4.  

  8.  
  9. Using an ohmmeter, measure the secondary coil resistance between the positive ( + ) and high-tension terminals. The readings should be:
    1. Cold: 9.3-16.0 kilo-ohms
    2.  
    3. Hot: 11.7-18.8 kilo-ohms
    4.  

  10.  
  11. If the resistance is not as specified, replace the ignition coil.
  12.  

 
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