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Test NS-6A - Repairing Ignition Coil System

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Disconnect ignition coil 3-pin connector. Turn ignition on. 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 female connector and ignition splice, and perform TEST VER-1.
  2. Measure resistance between ignition coil towers No. 2 and 3. See Fig 1 . If resistance is more than 1.5 ohms, go to next step. If resistance is less than 1.5 ohms, disconnect power transistor 8-pin connector located under ignition coil assembly. Measure resistance of Yellow/Green wire between ignition coil 3-pin female connector terminal No. 2 and power transistor 8-pin connector terminal No. 8. If resistance is less than 10 ohms, go to step 5). If resistance is more than 10 ohms, repair open circuit in Yellow/Green wire between ignition coil 3-pin female connector and power transistor 8-pin connector, and perform TEST VER-1.
  3. Remove ignition coil assembly from vehicle. Disconnect ignition coil pigtail. Measure resistance of White wire in ignition coil pigtail. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, replace ignition coil pigtail, and perform TEST VER-1.
  4. Inspect ignition coil pigtail for obvious damage. If obvious damage is present, replace ignition coil pigtail, and perform TEST VER-1. If no obvious damage is present, replace ignition coil, and perform TEST VER-1.
  5. Reconnect ignition coil 3-pin connector. Measure voltage on power transistor 8-pin connector terminal No. 8 (Yellow/Green wire). If voltage is less than 10 volts, go to next step. If voltage is more than 10 volts, repair short to ground in Yellow/Green wire, and perform TEST VER-1.
  6. Measure voltage on power transistor 8-pin connector terminal No. 1 (Yellow/Black wire). If voltage is more than 10 volts, go to step 10). If voltage is less than 10 volts, turn ignition off. Disconnect ignition coil 3-pin connector. Measure resistance between ignition coil 3-pin 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, and perform TEST VER-1.
  7. 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 between ignition coil 3-pin female connector and power transistor 8-pin connector, and perform TEST VER-1.
  8. Remove ignition coil assembly from vehicle. Disconnect ignition coil pigtail. Measure resistance of Yellow/Black wire in 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, and perform TEST VER-1.
  9. Inspect ignition coil pigtail for obvious damage. If obvious damage is present, replace ignition coil pigtail, and perform TEST VER-1. If no obvious damage is present, replace ignition coil, and perform TEST VER-1.
  10. Turn ignition off. Measure resistance of 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, and perform TEST VER-1.
  11. Reconnect power transistor connector. Using an analog voltmeter, backprobe ECU 18-pin connector terminal No. 54 (Yellow wire). Crank engine and observe voltmeter. If voltage is more than one volt, go to next step. If voltage is less than one volt, go to step 15).
  12. Using a voltmeter, backprobe ECU 18-pin connector terminal No. 54 (Yellow/Red wire). If voltage is less than one volt, go to next step. If voltage is more than one volt, replace ECU, and perform TEST VER-1.
  13. Turn ignition 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, and perform TEST VER-1.
  14. Measure resistance between ECU 18-pin connector terminal No. 55 (Yellow/Red wire) and ground. If resistance is more than 10 ohms, replace power transistor, and perform TEST VER-1. If resistance is less than 10 ohms, repair Yellow/Red wire for a short to ground, and perform TEST VER-1.
  15. Turn ignition 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, and perform TEST VER-1.
  16. Measure resistance between ECU 18-pin connector terminal No. 54 (Yellow wire) and ground. If resistance is more than 10 ohms, replace power transistor, and perform TEST VER-1. If resistance is less than 10 ohms, repair Yellow wire for a short to ground, and perform TEST VER-1.
Fig 1: Identifying Ignition Coil Towers
G92F05830Courtesy of CHRYSLER MOTORS.
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