24 Tooth Gear
TDC Pulse Gear
4.12.4 Setting Nissan Optic Slots Timing
This is a standard setup for most Nissan engines. There is a metal
disk with 360 fine slots and large slots equaling the number of
cylinders. It has two optical sensors. The ECU uses only the large
slots. If the system has a rotor and single coil, do the setup and
rotor fazing as described above under Rotor Fazing.
If it has coil packs put the engine on the TDC marks. Adjust the dizzy to be in the middle of the
fasten bolt and slot grove. Now adjustments can be made on the Timing Sensor °BTDC field to get
the engine to start. Remember that under active sensors set the trigger level to positive edge. To
check if this setting is correct disconnect the injector fuses and crank the engine with a timing light.
See if the light flashes between 5 and 10°. If not adjust the value till it does.
If the engine stops during cranking it means the timing is too fast. Increase the value and try again.
Once the engine starts, check with the timing light and fine tune this value so that the ECU timing
correlates to the real timing. If the engine back-fires the coil sequence may be incorrect. Check the
wiring diagram and change the wiring on the coil packs.
Distributor Sensor
Signal
4.13 Fuel Supply
This is not really part of the ECU but it is a vital system which is the cause for many problems in
the operation of the ECU. Please take time to ensure this system is properly set up as the ECU
has no control over it. The only indication for problems here is the Lambda sensor. If the fuel
pressure drops, or becomes erratic due to air in the system, the Lambda value will go lean. This
will cause power loss and slight backfires which may sound like timing.
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