CDI Electronics Outboard Ignition Troubleshooting Guide

145 Yamaha Troubleshooting Yamaha 3. Disconnect the yellow wire from the pack and retest. If the engine now sparks, the Blanker coil is likely bad. 4. Check the stator resistance. Read from Read to Reading Ohms DVA (connected to pack) Brown Blue 188-282 135 V Minimum 5. Check the resistance and DVA output of the Triggers: Read from Read to Reading Ohms DVA (connected to pack) White/Red Trigger wire Engine ground 63-93 2 V Minimum White/Black Trigger wire Engine ground 63-93 2 V Minimum Yellow Engine ground 22-30 10 V Minimum 6. Check the cranking RPM. A cranking speed of less than 250-RPM will not allow the system to fire properly. NO SPARK OR INTERMITTENT ON ONE OR MORE CYLINDERS: 1. Check the resistance and DVA output of the stator plate assembly: Read from Read to Reading Ohms DVA (connected to pack) White/Red Trigger wire Engine ground 65-93 2 V Minimum White/Black Trigger wire Engine ground 65-85 2 V Minimum 2. Check the Blanker coil as follows as a defective Blanker coil can cause timing variance or not fire: Check From: Check To: Ohms Reading: DVA Reading: Yellow Engine ground 25-35 ohms 10 V Minimum 3. Check the DVA output on the Black/White wires from the power pack while connected to the ignition coils. Read from Read to DVA (connected to pack) Black/White Coil Engine ground 150 V (1989-94) Minimum 3. 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). 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). Also, 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. 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 pressure AT THE CARBURETOR. You should see over 2 PSI. Check fuel lines for inner wall breakdown and wall collapse. 7. Check the Blanker coil as follows as a defective Blanker coil can cause timing variance or not fire: Check From: Check To: Ohms Reading: DVA Reading: Yellow Engine ground 25-35 ohms 10 Volts Minimum WILL NOT STOP (KILL): 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. C55 HP (2 Cyl) 1995 697-85540-00-00 NO SPARK ON ANY CYLINDER: 1. Disconnect the White stop wire and retest. If the engine’s ignition 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. Disconnect the yellow wire from the pack and retest. If the engine now sparks, the Blanker coil is likely bad.