Hi, you have provided trouble codes p0100 AND p1605. A/T Diagnosis Communication Line Malfunction Possible Causes:
Trouble Code: P0100
Mass Airflow Sensor Circuit Malfunction
Possible Causes:
Air Intake leaks located after the MAF sensor assembly
MAF sensor signal circuit is open, shorted to ground or power
MAF sensor has failed
PCM has failed
Trouble Code: P1605
TCM communication line circuit is open or shorted to ground
TCM communication line circuit shorted to VREF or power (B+)
TCM or PCM has failed
TSB 01-004 (01/01) contains information related to this code
For the P0100, check the connector on top of the MAF sesnor for looseness or corrosion. Connector is on top in piocture below.
For P1605, the following TSB may apply:
ELECTRICAL SYSTEM
NTB00080
Oct 2000
SOME CUSTOMERS MAY COMMENT THAT THE VEHICLE LACKS POWER AND THAT THE TRANSMISSION REMAINS IN THIRD GEAR AT ALL TIMES DUE TO LOW BATTERY VOLTAGE. ( NHTSA ITEM NUMBER - 618805 )
To determine cause, first check voltage at battery with engine running or remove alternator and have tested. If voltage is less than 13.5 or alternator fails test, replace alternator.
If alternator voltage passes or ia above 13 volts, check wiring as follows.
sorry, alternator voltage should be above 13.5.
Here is the diagram showing the PCM connection to the transmission wires. These are the wires to check if the alternator is OK.
here is a close-up of the diagram/wires.
Also, please check fuse 11.
below are the tests to check the TCM:
If power is not getting to the TCM, trace the wiring back to the fuse box--the brown wire with a red stripe.
here is procedure to remove the alternator:
Removal & Installation
1.6L, 1.8L & 2.0L EnginesBefore servicing the vehicle, refer to the Precautions section.
Remove or disconnect the following:
Negative battery cable
2 lead wires and connector from the alternator
Drive belt adjusting bolt, loosen only
Drive belt
Alternator 
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Mi carro es un nissan ex 2000 pero el scaner me da un codigo que es el P0100
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