Mazda 121 Workshop Manual page 269

CONTROL SYSTEM
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3. Place the SST (Sheet) on the Engine Slgnal Monitor.
4. Measure the voftage at each terminal.
(Refer to pages F 114 to F-119.)
5. lf any ECU termjnal voltage is incorfect, check the related
inpui or output devices and wiring. lf no problem is iound,
replace the ECU. (Refer to above.)
Caulion
. Never apply voltage to SST terminals A and g.
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