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Ignition Coil Test (S2000)

NOTE: Ensure ignition, fuel and emission systems are working properly before performing ignition coil test.
  1. Remove ignition coil cover. Loosen suspect ignition coil bolt. Disconnect suspect ignition coil connector. Turn ignition on. Measure voltage between ground and ignition coil harness connector terminal No. 3 (Black/Yellow wire). See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, check for open in Black/Yellow wire between suspect ignition coil and fuse No. 4 (15-amp). See WIRING DIAGRAMS article. Fuse is located in underdash fuse/relay box, behind left kick panel.
  2. Turn ignition off. Check for continuity between ground and suspect ignition coil harness connector terminal No. 2 (Black wire). If continuity exists, go to next step. If continuity does not exist, check for open in Black wire between suspect ignition coil and ground connector G101. Ground connector G101 is located at rear of engine head.
  3. Disconnect PCM 31-pin connector "C". Check for continuity between body ground and PCM 31-pin harness connector "C" terminals No. 4 (White wire), No.12 (White/Green wire), No. 13 (White/Black wire) and/or No. 14 (White/Blue wire). If continuity does not exist, go to next step. If continuity exists, check for short to ground in wire between suspect ignition coil terminal No. 1 and PCM 31-pin connector "C".
  4. Reconnect PCM 31-pin connector "C". Turn ignition switch to START position. Measure voltage between ground and suspect ignition coil harness connector terminal No. 1. If about 1-2 volts exists, replace ignition coil. If about 1-2 volts do not exist, check for open in wire between suspect ignition coil terminal No. 1 and PCM 31-pin connector "C".
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