CDI Electronics Outboard Ignition Troubleshooting Guide

132 TROUBLESHOOTING GUIDE - Yamaha Troubleshooting Yamaha Troubleshooting WILL NOT STOP (KILL): 1. Disconnect the White wire from the CD Module. 2. 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. 9.9 HP 1996-2005 15 HP 1996-2009 63V-85540-01-00 NO SPARK ON ANY CYLINDER: 1. Disconnect the White stop wire and retest. If the ignition system now has spark, the stop circuit has a problem. 2. Inspect and clean all engine and ignition ground connections. 3. Check the resistance and DVA voltage of the charge coil, trigger coils and ignition coil. Check From: Check To: Ohms Reading: DVA Connected White/Red Black 352 to 528 2.5 V Minimum Brown (Charge Coil) Blue 238 to 372 200 V Minimum Black/Orange (Top Cyl) Black (Eng Gnd) N/A 170 V Minimum Black/White (Bottom Cyl) Black (Eng Gnd) N/A 170 V Minimum Orange Black 0.04 to 0.08 Spark Plug Cap 1 Engine Ground 1.89K (1890) to 2.31K (2310) Spark Plug Cap 2 Engine Ground 1.89K (1890) to 2.31K (2310) NO SPARK ON ONE CYLINDER: 1. Check the resistance of the ignition coil. Check From: Check To: Ohms Reading: Orange Black 0.04 to 0.08 Spark Plug Cap 1 Engine Ground 1.89K (1890) to 2.31K (2310) 2. Swap the ignition coil not firing with the one that is firing. If the problem stays with the same coil, replace it. If the problem stays on the same cylinder, replace the ignition pack. 3. Inspect the flywheel to see if both trigger tabs are still on it. HAS SPARK BUT WILL NOT RUN: 1. Make sure the engine is getting fuel to the combustion chamber (make sure there is no water or residue in the carburetor). 2. Check flywheel shear key to make sure it has not sheared due to backfiring or impact on the propeller. 3. Check flywheel magnet to make sure it has not broken loose and moved, causing a timing shift. 4. Check spark plug for presence of water, indicating a possible cracked block or blown head gasket. 5. Check compression, carburetor, reeds and do a cylinder leak down test. 6. Check the fuel in the carburetor. Check to see if a very high ethanol content is present. . If so, purge the fuel system with fresh fuel and see if the engine will start. 7. Check the fuel pressure AT THE CARBURETOR. You should see over 2 PSI. Check fuel lines for inner wall breakdown and wall collapse. 8. Check the Triggers as follows as a defective trigger can cause timing variance: Check From: Check To: Ohms Reading: DVA Reading: White/Red Black 396 to 484 2.5 V Minimum WILL NOT STOP (KILL): 1. Disconnect the White wire from the CD Module. 2. 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.