CDI Electronics Outboard Ignition Troubleshooting Guide

166 TROUBLESHOOTING GUIDE - Yamaha Troubleshooting Yamaha Troubleshooting 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 bad. If the engine has no spark with the jumper connected, either the wiring harness, key switch or emergency stop switch is bad. C150 (6 Cyl) 1996-1999 6G6-85540-00-00 NO SPARK ON ANY CYLINDER: 1. Disconnect the White stop wire and retest. If the engine’s ignition now has spark, the stop circuit has a fault. Check the key switch, harness and shift switch. 2. Inspect and clean all engine and ignition ground connections. 3. Check the resistance and DVA output of the Stator and Trigger: Read from Read to OEM Reading CDI Reading DVA (connected) White/Red Trigger wire White/ Green Trigger wire 256-384 ohms - 2 V Minimum White/Black Trigger wire White/Blue Trigger wire 256-384 ohms - 2 V Minimum White/ Yellow Trigger wire White/Brown Trigger wire 256-384 ohms - 2 V Minimum Brown Stator wire Red Stator wire 428-642 ohms - 90 V Minimum Blue Stator wire Black/Red Stator wire 64-96 ohms - 30 V Minimum 4. Check the cranking RPM. A cranking speed of less than 250-RPM will not allow the system to spark properly. Th is can be caused by a weak battery, dragging starter, bad battery cables or a mechanical problem inside the engine. NO SPARK OR INTERMITTENT SPARK ON ONE OR MORE CYLINDERS: 1. Check the resistance and DVA output of the Stator and Trigger: Read from Read to OEM Reading CDI Reading DVA (connected) White/Red Trigger wire White/ Green Trigger wire 256-384 ohms - 2 V Minimum White/Red Trigger wire Eng Ground Open Open 2.5 V Minimum White/ Green Trigger wire Eng Ground Open Open 2.5 V Minimum White/Black Trigger wire White/Blue Trigger wire 288-432 ohms - 2.5 V Minimum White/ Black Trigger wire Eng Ground Open Open 2.5 V Minimum White/ Blue Trigger wire Eng Ground Open Open 2.5 V Minimum White/ Yellow Trigger wire White/Brown Trigger wire 288-432 ohms - 2.5 V Minimum White/ Yellow Trigger wire Eng Ground Open Open 2.5 V Minimum White/Brown Trigger wire Eng Ground Open Open 2.5 V Minimum Brown Stator wire Red Stator wire 428-642 ohms - 90 V Minimum Brown Stator wire Eng Ground Open Open 90 V Minimum Red Stator wire Eng Ground Open Open 90 V Minimum Blue Stator wire Black/Red Stator wire 64-96 ohms - 30 V Minimum Blue Stator wire Eng Ground Open Open 30 V Minimum Black/Red Stator wire Eng Ground Open Open 30 V Minimum Black/White to Ign Coil Eng Ground 65 V Minimum 2. Check the DVA output on the Black/White wires from the power pack while connected to the ignition coils. You should have a reading of at least 65V. If the reading is low on one cylinder, disconnect the 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).