Yamaha Troubleshooting 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, CDI unit or spark plug.
S.A.F.E. WILL NOT ENGAGE: 1. Disconnect the Pink warning wire from the CDI unit. Connect a jumper wire to engine ground and connect it to the Pink wire from the CDI unit (If it still fails to engage, the CDI unit is likely bad). If the engine now limits at approximately 2,000 RPM, check the wiring from the temperature sensor and oil tank to the CDI unit.
ENGINE WILL NOT STOP (KILL):
Yamaha
1. Short the White wire from the CDI unit 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 CDI unit.
C70 HP 2001 (3 Cyl)
(6H2-85540-13-00) Service Notes: 1. Please refer to the General Troubleshooting section in the beginning of the Troubleshooting Guide for a better understanding of basic outboard principles, terminology, and repair techniques prior to attempting any troubleshooting or repairs. 2. All resistance tests are done disconnected from all other components. 3. All DVA tests are done at cranking speed unless otherwise noted. 4. Please use the Factory recommended spark plug specified and gapped at the correct setting. WARNING!!! NEVER DISCONNECT THE SPARK PLUG WIRES WHILE THE ENGINE IS RUNNING AS THIS WILL DAMAGE THE CDI UNIT. DO NOT ATTEMPT TO START THE ENGINE WITH THE SPARK PLUG WIRES NOT CONNECTED EITHER TO THE SPARK PLUGS OR A SPARK TESTER.
GENERAL 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 of the Charge coil, Pulser coils, and CDI unit:
Read from Read to Brown (Charge coil) Blue (Charge coil) White/Red (#1Pulser coil) White/Black (#2 Pulser coil) Black/Orange (#1 Primary) Engine Ground Black/White (#2 Primary) Engine Ground Black/Yellow (#3 Primary) Engine Ground
Ohms DVA (Connected) DVA (Disconnected) 136-204 Ω 150 V Minimum 150 V Minimum 240-360 Ω 2.5 V Minimum 4.5 V Minimum 105 V Minimum - 0 V Minimum (at idle) - 105 V Minimum -
NOTE: The #2 Cylinder is Triggered by the CDI unit, it is normal for it to have no fire under 1500 RPM. NOTE: At 1,500 RPM, all cylinders should show a CDI unit output voltage of 145 V Minimum. NOTE: Never test the CDI unit disconnected or damage to the CDI unit could occur!
NO SPARK OR INTERMITTENT ON ONE OR MORE CYLINDERS: 1. Check the resistance and DVA of the Pulser coil, Crank Position Sensor, and CDI unit as follows: Read from
White/Red (#1 Pulser coil) Blue/Red (Crank Position Sensor) Black/Orange (#1 Primary) Black/White (#2 Primary) Black/Yellow (#3 Primary)
Read to
Ohms
DVA (Connected) DVA (Disconnected)
White/Black (#2 Pulser coil) 240-360 Ω 2.5 V Minimum 4.5 V Minimum Blue/White (Crank Position Sensor) 158-236 Ω 5 V Minimum 5 V Minimum Engine Ground - 105 V Minimum Engine Ground - 0 V (at idle) Engine Ground - 105 V Minimum -
NOTE: The #2 Cylinder is Triggered by the CDI unit, it is normal for it to have no fire at cranking or idling. All cylinders should fire by 1,500 RPM.
TECH SUPPORT: 1.866.423.4832 CUSTOMER SERVICE: 1.800.467.3371 www.cdielectronics.com
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