Volkswagen Golf/Jetta/Cabriole 1990-1999

Ignition Coil Pack

Print

TESTING





Click image to see an enlarged view

Fig. Ignition coil harness connector identification

Voltage Supply Check

This test confirms the coil is receiving a voltage signal to charge the coils.

  1. Remove the five-pin harness connector from the ignition coil pack.
  2.  
  3. Using a digital voltmeter, connect the negative lead to terminal 1 and the positive lead to terminal 5.
  4.  
  5. Turn the ignition switch ON but do not start the engine.
  6.  
  7. The voltmeter should read 10-12 volts.
  8.  
  9. If the voltmeter does not read 10-12 volts, check the integrity of the wiring, and supply voltage to the ECM.
  10.  
  11. Turn the ignition switch OFF and plug the five-pin harness connector into the coil pack.
  12.  

Signal Check

This test confirms that the ECM is sending an activation signal to the coils for firing the spark plugs.


NOTE
This test requires the use of a LED test light. Do NOT use an incandescent test light; the current required to illuminate the lamp can damage the ECM.

  1. Remove the fuel pump fuse to prevent the cylinders from filling with fuel while the engine is being cranked.
  2.  
  3. Remove the five-pin harness connector from the ignition coil pack.
  4.  
  5. Using an LED test light, connect the leads to terminal 2 and terminal 5.
  6.  
  7. Turn the ignition switch ON and crank the engine.
  8.  
  9. While the engine is cranking, the LED test light should flash. This indicates that a signal is being sent to the power stage inside the coil.
  10.  
  11. Turn the ignition switch OFF and reconnect the test leads to terminals 3 and 5.
  12.  
  13. Again, turn the ignition switch ON crank the engine. Verify that the LED flashes.
  14.  
  15. Turn the ignition switch OFF and reconnect the test leads to terminals 4 and 5.
  16.  
  17. Crank the engine with the ignition switch once again, and verify that the LED flashes.
  18.  
  19. If the LED does not flash, this indicates that a signal is not being sent to the coil. Causes include faulty wiring, or problems with the crankshaft position sensor and/or ECM. Refer to for more information.
  20.  
  21. Turn the ignition switch OFF and plug the five-pin harness connector into the coil pack.
  22.  
  23. Install the fuel pump fuse.
  24.  

REMOVAL & INSTALLATION



  1. Remove the five-pin harness connector from the ignition coil pack.
  2.  
  3. Using a paint marker or other means, mark each spark plug wire so they can be installed in their proper locations upon coil installation.
  4.  
  5. Once the spark plugs are marked, remove them from the coil pack. When removing the wires, make sure to pull on the boots, not the wires themselves, as they may be damaged.
  6.  
  7. Remove the four bolts that secure the coil pack to the cylinder head. Make sure to hold the coil pack when removing the bolts.
  8.  

To install:

  1. Clean the dielectric grease from the coil pack mounting surface on the cylinder head. If installing the old coil, make sure to clean the grease from the coil pack also.
  2.  
  3. Apply an even coat of dielectric grease to the coil pack mounting surface on the cylinder head.
  4.  
  5. Position the coil pack, and insert the mounting bolts. Finger-tighten the bolts to hold the coil pack in place.
  6.  
  7. Using a torque wrench, tighten the coil pack-to-cylinder head bolts to 7 ft. lbs. (10 Nm).
  8.  
  9. Place a small amount of dielectric grease on each spark plug wire terminal, and install the spark plug boots in the proper order. If a new coil pack is being is installed, note the marks on the old coil pack, using them as a guide to install the spark plug wires on the new coil pack.
  10.  
  11. Plug in the five-pin harness connector to the ignition coil pack.
  12.  

 
label.common.footer.alt.autozoneLogo