micra expert here
right the older k11 shape micras with cg10 and cg13 engines have a one piece throttle body with a thin film airflow meter mounted on oneside.
these do fail an cannot be repaired but all is not lost please try the following things first.
i take it the car is a flat as a pancake power wise or wont idle at mo, and your mum dosent drive it hard.
Just above the rad on the scuttle panel is a little fusebox approx 6inch long rectangular take the lid off an check for corrision as this will also give same fault, your normally find at least 2 fuses are corroded an terminals melted.
this may cure fault.
also pulling fuses 3 and 16 will wipe the ecu adapitive memory sometimes if this arnt driven hard they use up all the adapation trying to run lean or short trips.
if this dosent cure it recon throttle bodies are avaliable from here
http://www.bba-reman.com/catalogue/D...iledProduct=15 (manual version)
To fit remove old, take off airbox lid and with hose clip on lower lid an pull off, should be 4 10mm bolts, throttle cable and connector for throttle pos sensor.
replace with new to setup disconnect TPS sensor plug with engine running and turn idle bleed screw( sticks out at 45 deg towards servo) and set idle to 800 rpm, reconnect TPS loom jobs a goodun