CDI Electronics Outboard Ignition Troubleshooting Guide

149 Yamaha Troubleshooting Yamaha C70 HP (3 Cyl) 1994-2000 6H3-85540-11-00 / 117-6H3-11 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. Verify the correct spark plugs are installed. 4. Check the resistance and DVA output of the Stator and Trigger: Read from Read to Ohm Reading DVA (connected) DVA (Disconnected) White/Red Trigger wire Black wire 104-156 2.5 V Minimum 4.5 V Minimum White/Black Trigger wire Black wire 104-156 2.5 V Minimum 4.5 V Minimum White/Green Trigger wire Black wire 104-156 2.5 V Minimum 4.5 V Minimum Brown Stator wire Black Stator wire 145-198 140 V Minimum 170 V Minimum Black/White Engine Ground - 100 V Minimum NO SPARK OR INTERMITTENT ON ONE OR MORE CYLINDERS: 1. Check the resistance and DVA output of the Trigger: Read from Read to Ohm Reading DVA (connected) DVA (Disconnected) White/Red Trigger wire Black wire 104-156 2.5 V Minimum 4.5 V Minimum White/Black Trigger wire Black wire 104-156 2.5 V Minimum 4.5 V Minimum White/Green Trigger wire Black wire 104-156 2.5 V Minimum 4.5 V Minimum Brown Stator wire Black wire 145-198 140 V Minimum 170 V Minimum Black/White (Pack Output) Engine Ground - 100 V Minimum Black/White (Coil) Black 3.84K-5.76K 2. Swap the problem coil with another coil. If the problem moves with the coil, the ignition coil is likely bad. ENGINE WILL NOT ACCELERATE ABOVE APPROXIMATELY 2000 RPM: 1. Verify the engine is not overheating and causing the power pack to limit the RPM. 2. Disconnect the Pink wire from the power pack and retest. If the engine now performs correctly, check the overheat sensor, oil level in the oil tank mounted on the engine and the wiring harness. 3. Verify the ignition timing is advancing to the WOT setting (18-20 Degrees BTDC). 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 an increase in voltage on the Blue to the Brown stator wires, stabilizing and showing a slight decrease over 5000 RPM. A sharp drop in voltage can be the result of a bad stator coil or a bad pack. HIGH SPEED MISS: 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. S.A.F.E. WILL NOT ENGAGE: Disconnect the Pink warning wire from the power pack. Connect a jumper wire to engine ground and connect it to the Pink wire from the power pack (If it still fails to engage, the power pack is likely bad). If the engine now limits at approximately 2000 RPM, check the wiring from the temperature sensor and oil tank to the power pack. ENGINE WILL NOT STOP RUNNING: Short the White wire from the CD Module to engine ground. If the engine stops, the problem is in the stop circuit. If the engine continues to run with the White wire shorted to engine ground, replace the defective CD Module.