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Test Dr-14A - Testing Ignition Coil

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase faults. Start engine and idle for more than one minute. Read faults. If Code 44 is displayed again, go to next step. If Code 44 is not displayed again, go to step 3).
  2. Ensure engine and ignition are off. Disconnect power transistor 8-pin connector. Power transistor 8-pin connector is located under ignition coil assembly. Turn ignition on. Measure voltage at power transistor 8-pin connector terminal No. 8 (Yellow/Green wire). If voltage is less than 10 volts, go to step 5). If voltage is more than 10 volts, go to step 10).
  3. Wiggle power transistor wire harness while monitoring DRB-II display. If Code 44 is not set when wire harness is wiggled, go to next step. If Code 44 is set when wire harness is wiggled, repair wire harness causing Code 44 to set. Perform TEST VER-2.
  4. Wiggle ignition coil wire harness while monitoring DRB-II display. If Code 44 is not set when wire harness is wiggled, perform TEST DR-15A. If Code 44 is set when wire harness is wiggled, repair wire harness causing Code 44 to set. Perform TEST VER-2.
  5. Disconnect ignition coil 3-pin connector. Measure voltage on ignition coil 3-pin female connector terminal No. 3 (Black/White wire). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open circuit in Black/White wire between ignition coil and ignition switch. Perform TEST VER-2.
  6. Turn ignition off. Measure resistance between ignition coil 3-pin female connector terminal No. 2 (Yellow/Green wire) and ground. If resistance is more than 10 ohms, go to next step. If resistance is less than 10 ohms, repair short to ground in Yellow/Green wire. Perform TEST VER-2.
  7. Measure resistance of Yellow/Green wire between ignition coil 3-pin female connector and power transistor 8-pin connector. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Yellow/Green wire. Perform TEST VER-2.
  8. Remove ignition coil assembly from vehicle. Disconnect ignition coil pigtail. Measure resistance of Yellow/Green wire on ignition coil pigtail. If resistance is more than 10 ohms, go to next step. If resistance is less than 10 ohms, replace ignition coil pigtail. Perform TEST VER-2.
  9. Inspect ignition coil pigtail for obvious damage. If damage is not present, replace ignition coil assembly. Perform TEST VER-2. If damage is present, replace ignition coil pigtail. Perform TEST VER-2.
  10. Measure voltage on power transistor 8-pin connector terminal No. 1 (Yellow/Black wire). If voltage is more than 10 volts, go to step 16). If voltage is less than 10 volts, disconnect ignition coil 3-pin connector.
  11. Measure voltage on ignition coil 3-pin female connector terminal No. 3 (Black/White wire). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open circuit in Black/White wire between ignition switch and ignition coil. Perform TEST VER-2.
  12. Turn ignition off. Measure resistance between ignition coil 3-pin female connector terminal No. 1 (Yellow/Black wire) and ground. If resistance is more than 10 ohms, go to next step. If resistance is less than 10 ohms, repair short to ground in Yellow/Black wire. Perform TEST VER-2.
  13. Measure resistance of Yellow/Black wire between ignition coil 3-pin female connector and power transistor 8-pin connector. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Yellow/Black wire. Perform TEST VER-2.
  14. Remove ignition coil assembly from vehicle. Disconnect ignition coil pigtail. Measure resistance of Yellow/Black wire on ignition coil pigtail. If resistance is more than 10 ohms, go to next step. If resistance is less than 10 ohms, replace ignition coil pigtail. Perform TEST VER-2.
  15. Inspect ignition coil pigtail for obvious damage. If no damage is present, replace ignition coil assembly. Perform TEST VER-2. If damage is present, replace ignition coil pigtail. Perform TEST VER-2.
  16. Turn ignition off. Measure resistance between power transistor 8-pin connector terminal No. 3 (Black wire) and ground. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Black wire. Perform TEST VER-2.
  17. Reconnect power transistor connector. Using analog voltmeter, backprobe ECU 18-pin connector terminal No. 54 (Yellow wire). Start engine. If voltage is more than .25 volt, go to next step. If voltage is less than .25 volt, go to step 20).
  18. Turn engine off. Disconnect ECU 18-pin connector. Disconnect power transistor 8-pin connector. Measure resistance of Yellow wire between ECU 18-pin connector terminal No. 54 and power transistor 8-pin connector terminal No. 7. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Yellow wire. Perform TEST VER-2.
  19. Measure resistance between power transistor 8-pin connector Yellow wire and ground. If resistance is more than 10 ohms, replace power transistor. Perform TEST VER-2. If resistance is less than 10 ohms, repair short to ground in Yellow wire. Perform TEST VER-2.
  20. Without disconnecting ECU connector, backprobe ECU 18-pin connector terminal No. 55 (Yellow/Red wire) using voltmeter. If voltage is less than .25 volt, go to next step. If voltage is more than .25 volt, replace ECU. Perform TEST VER-2.
  21. Turn engine off. Disconnect ECU 18-pin connector. Disconnect power transistor 8-pin connector. Measure resistance of Yellow/Red wire between ECU 18-pin connector terminal No. 55 and power transistor 8-pin connector terminal No. 2. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Yellow/Red wire. Perform TEST VER-2.
  22. Measure resistance between Yellow/Red wire and ground. If resistance is more than 10 ohms, replace power transistor. Perform TEST VER-2. If resistance is less than 10 ohms, repair short to ground in Yellow/Red wire. Perform TEST VER-2.
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