CDI Electronics Outboard Ignition Troubleshooting Guide

127 Tohatsu/Nissan Troubleshooting Tohatsu/Nissan NISSAN/TOHATSU TLDI (Tohatsu Low Pressure Direct Injected) Engines Service Notes: Please use the Factory recommended spark plug specified and gapped at the correct setting (listed on the engine decal). The maximum spark timing is controlled by the ignition ECU and is non-adjustable. SERVICE NOTE: BATTERY voltage is critical to the engine running correctly. The use of a under-sized battery can cause problems with the engine performance. It is HIGHLY recommended a 1000 CCA battery be used with these engines. GENERAL NOTICE: If the following information does not help resolve the problem, please refer the customer to a Certified Tohatsu/Nissan Dealer for service. ENGINE HAS SPARK BUT WILL NOT RUN: 1. Check fuel pressure. If low, check to see if the high pressure fuel pump is running when you turn on the keyswtich. 40-70 HP Model’s A & B (2 Star) should be approximately 80 PSI Air and 90 PSI Fuel. 40-50 HP Model B2, 75-90 HP Model C and 115 Model A (3 Star) should be approximately 94 PSI Air and 104 PSI Fuel. If the fuel pressure is low and the air pressure is OK, the problem is usually in the fuel circuit. Check the fuel supply to the vapor separator, high pressure fuel pump and high pressure fuel lines. 2. If the fuel and air pressure are both low, disconnect the air filter for the compressor and see if the air pressure is now correct and the engine will run. If so, replace the air filter. 3. If the air and fuel pressure remain low, disconnect the air line from the compressor and pressurize the air rail using shop air, regulated at 80 PSI (90 PSI for the 3 Star engines). If the engine runs, replace the compressor. ENGINE WILL NOT THROTTLE UP- WILL ONLY IDLE: 1. Re-set the TPS. If someone has tried to start the engine in gear for 25 times or more, the ECU will lock out anything above an idle until the TPS (Throttle Position Sensor) is re-set. 2. Check the air and fuel pressures. 40-70 HP Model A & B should be 80 PSI Air and 90 PSI Fuel. 40-50 HP Model B2, 75-90 HP Model C and 115 Model A, should be at 94 PSI Air and 104 PSI Fuel. 3. Check the engine temperature and temperature sensor. If the engine is over-heating (over 203 degrees) or if the temperature sensor is defective, the engine will be in a forced idle mode. 4. Check to see if both #1 & #2 TPS sensors are defective. The TPS sensors must be replaced as a SET. 5. On engines with an electric oil pump, check to see if the oil pump is operating. NO SPARK OR WEAK SPARK ON ANY CYLINDER: 1. Disconnect the Brown stop wire from the harness. 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 the spark plug wires, boots and spark plugs. Check for chafing on the wiring and harnesses. 3. Inspect and clean all engine ground connections and power connections. Remember, the engine MUST HAVE battery power to the engine’s ignition system to run. 4. For models 40A, 50A, 70A and 90A ONLY, check the Stator as follows: WIRE READ TO RESISTANCE White/Red White/Blue 438-592 Ohms Green White/Yellow 61-82.6 Ohms NOTE: B and C models are INDUCTIVE systems running on battery power. NO SPARK OR WEAK SPARK ON ONE CYLINDER: 1. Inspect the spark plug wires, boots and spark plugs. Check for chafing on the wiring and harnesses. 2. Clean and inspect coil Black ground wire connection to engine ground. 3. If the cylinders are only misfiring above an idle, connect an inductive RPM meter to all cylinders and try to isolate the problem cylinders.