DTC 2233

^ No reference voltage for air flow sensor and altitude sensor.

This code may be caused by:

a. Open or grounded circuit between terminal #21 of ignition control unit to terminal #26 of fuel control unit.
b. Faulty air flow sensor potentiometer (terminal #1 shorted to terminal #3).
c. Faulty altitude sensor (Terminal #2 shorted to terminal #3).
d. Grounded circuit between terminal #21 of ignition control unit and terminal #2 of altitude sensor.
e. Grounded circuit between terminal #26 of fuel control unit and terminal #1 of air flow sensor.