Code 15 - Ignition Output Signal

Turn ignition off. Remove hazard fuse in main fuse box for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Test drive and check again.
If light is on, turn ignition off. Disconnect 2-wire connector at distributor. Turn ignition on. Measure voltage between ground and Black/Yellow wire terminal on wire harness side. If battery voltage is not present, repair open Black/Yellow wire between connector and ignition switch.
If battery voltage is present, turn ignition off. Reconnect 2-wire or 6-wire connector. Connect ECU test harness between ECU and ECU connector. See Figure . Turn ignition on. Individually, measure voltage between terminal A18 (neg.) and terminals B15 and B17.
If approximately 10 volts is present, substitute a known good ECU and retest. If condition is rectified, replace original ECU. If specified voltage is not present, check for short or open in White wire between distributor and ECU terminal B15 or B17. If wires are okay, replace ignitor unit.
Turn ignition off. Disconnect 6-wire ignitor connector and connectors from ECU side only. Check for continuity between White wires and ECU terminals B15 and B17 and ignitor. If continuity does not exist, repair as necessary. If continuity does exist, check for continuity between ground and White wires of 6-wire connector. If continuity exists, repair short to ground. If continuity does not exist, replace ignitor unit.