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NS1 - Ignition System Tests

  1. Remove spark plug wire from plug. Hold wire terminal 1/4" from good ground, and crank engine. If good spark occurs, proceed to NS2. If no spark or weak spark occurs, remove ignition coil wire from distributor. Hold coil wire terminal 1/4" from good ground, and crank engine. If good spark occurs, problem is in distributor rotor, cap or spark plug wires.
  2. If no spark occurred, remove coil wire from coil. Connect ohmmeter leads to both ends of coil wire. Resistance should read 250-600 ohms per inch (3000-7000 ohms per foot). If not, replace coil wire. If resistance was okay, connect voltmeter positive lead to coil positive terminal. Attach negative lead securely to a good ground. Turn ignition switch to "RUN" position. Voltage should be within one volt of battery voltage. If not, repair wire to ignition switch.
  3. If voltage was correct in step 2), move voltmeter positive lead to the coil negative terminal. Voltmeter should again indicate within one volt of battery voltage. If voltage is correct, proceed to step 6).
  4. If voltage was not correct in step 3), turn ignition off. Remove 2 wires from coil negative terminal. Connect voltmeter to coil negative terminal and ground. Turn ignition switch to "RUN" position. Voltmeter should read within one volt of battery voltage. If voltage is okay, proceed to next step; if voltage is not okay, replace ignition coil.
  5. Turn ignition off. Reconnect Black/Yellow wire to coil negative terminal. Connect voltmeter to coil negative terminal and ground. Turn ignition switch to "RUN" position. Voltmeter should read within one volt of battery voltage. If within one volt of battery voltage, but engine will not start, replace ignitor assembly inside distributor. If not within one volt of battery voltage, replace speed sensor without O2 sensor feedback on some models. On other models, replace ECU with O2 sensor feedback.
  6. If reading in step 3) was within one volt of battery voltage, disconnect voltmeter and turn ignition off. Connect ohmmeter leads to coil positive and negative terminals. Primary resistance should be less than 1.2 ohms. If not, replace ignition coil.
  7. If primary resistance was correct, remove secondary wire from coil. Connect ohmmeter leads to coil negative terminal and secondary terminal. Secondary resistance should measure 8,000-11,000 ohms. If not, replace ignition coil. If secondary resistance was correct, proceed to step 8).
  8. Remove distributor cap and rotor. Connect ohmmeter leads to pick-up coil terminals. Pick-up coil resistance should be 900-1200 ohms. If not, replace pick-up coil.
  9. If pick-up coil resistance was okay, remove Light Blue and Black/White ignitor wires from ignition coil. Connect ohmmeter leads, in turn, to both ends of each wire. Continuity should exist. If continuity does not exist, repair open circuit of harness. If continuity exists, but engine still will not start, replace ignitor in distributor.
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