CDI Electronics Outboard Ignition Troubleshooting Guide

172 TROUBLESHOOTING GUIDE - Yamaha Troubleshooting Yamaha Troubleshooting 2. Check the DVA output on the Black Striped wires from the power pack while connected to the ignition coils. You should have a reading of at least 100 V or more. If the reading is low on one cylinder, disconnect the CDI wire from the ignition coil for that cylinder and reconnect it to a load resistor. Retest. If the reading is now good, the ignition coil is likely bad. A continued low reading indicates a bad power pack or trigger (test per above). ENGINE WILL NOT ACCELERATE ABOVE APPROXIMATELY 2000 RPM: 1. Verify the engine is not overheating and causing the control module to limit the RPM. 2. Verify the correct sparkplugs are installed and gapped correctly. ENGINE WILL NOT ACCELERATE ABOVE APPROXIMATELY 2500 RPM: 1. Using an inductive tachometer, check the RPM on all cylinders. A difference in readings between the individual cylinders can be caused by a bad coil, power pack or spark plug. 2. If all cylinders show the same RPM and the engine will only rev to approximately 2500 RPM, check the running stator DVA output from idle thru WOT. You should show a steady increase in voltage on the Blue to the Black/ Red stator wires throughout the RPM range. A drop in voltage can be the result of a bad stator coil or a bad regulator/rectifier (disconnect the Green wires to the regulator/rectifier and retest – if the engine now performs OK, the regulator/rectifier is likely bad). MISS AT ANY RPM: 1. Verify the engine is not overheating and causing the problem. 2. Using an inductive tachometer, check the RPM on all cylinders. A difference in readings between the individual cylinders can be caused by a bad coil, power pack or spark plug. 3. Disconnect the Green wires to the regulator/rectifier and retest – if the engine now performs OK, the regulator/ rectifier is likely bad. 4. Check the O2 sensor, White to White should read 100 ohms. Output should vary with throttle movement on a running engine. S.A.F.E. WILL NOT ENGAGE OR ENGINES REVS ABOVE 6500 RPM: 1. Disconnect the Pink warning wire from the control module. Connect a jumper wire to engine ground and connect it to the terminal where the Pink wire goes. If the engine now limits at approximately 2000 RPM, check the wiring from the temperature sensor and oil tank to the power pack. If it still fails to engage, the power pack is likely bad. 2. Verify the correct spark plugs are installed (incorrect spark plugs can generate RF noise, impacting the circuits in side the engine control module. ENGINE WILL NOT STOP: Disconnect the White stop wire and connect a jumper wire to engine ground. If you still have spark, the power pack is likely defective. If the engine has no spark with the jumper connected, check the wiring harness, key switch and emergency stop switch.