Mazda 121 Workshop Manual page 271

CONTBOL SYSTEM
F
Inco]r€ct Yolt.ge
ROOtvl 10,A llse burned
Op€n c rcuii in wi ng kom ROO|0A fuse to ECU leminal 14
Main relay mallunclion (Rel6r to page F-124)
Op€n or short circuit in wiring lrorn main relay lo ECU terminal 18
Always 0V ($aner turns)
. Open or shori circuit in wiring lrcm igniton switch (MTX), or inhlbitor switch
iAlx) to ECU terminal lC
Main relay (FUEL INJ retay) mallunclion (Reler to page F-124)
Op€n circuit in wiing ,rom main relay to diagnosls conneclor terminal +B
Open or shod circuit in wiring trom diagnosrs conn€clor termlnal MEN lo
ECU terminal 1D
Always battery voltage
Poor connection at ECIJ connector
ECU mallunclion
ECU mallunclion
2.5V
No display on Self-
oiagnosis Checker
Main relay (FUEL INJ relay) malfuncllon (Reler lo pase F-124)
Open circlit in wirlng lrom main relay lo diagnosis connector teminal +B
''SA displayed and
. Open or shorl circuil in wiing from diagnosis conneclor terminal FEN to
ECU termlnal 1F
Always Baliery voltage
Poor connection al ECu connector
ECU mallunction
. Shon circuit in wirinS fiorn gniter io ECU teminal 1G
t.4aln relay {FUEL INJ relay) malrunclion (Befer to pase F-124)
Poor connection at ECU connector
Open ckcuil in wking lrom cncuit opening felay to ECU lerminal 1l
. Open circuit in wiing lrom AC re ay lo ECLJ terminal 1J
. Shon cncoit ln wirng trom diagnosis connector ierminalTEN lo ECU lerminal lK
Always batlery vonage
. Open cncuit in wiins trom diagnosis conneclor term nal TEN lo ECU tem|
. Open cicuil in wirins lfom diagnosis conneclor lerminal GND to ground
AIways 0V or Approx. 5V
. Open or shon circoii in wiring frcrn speed switch (Seclion I)to ECU lemi
na 1[,1
Always below 1.ov (sloplights OK)
. Open circuit in wiring lrom s1opllght swilch to ECU tem nal 10
P/S pressurc switch malluncllon Geier to page F-125)
Short circuit in wning lrom P/S pressure switch ECU terminal 1P
ECU matlunction
Always battery vollage
P/S pressure swilch maltunclion (Refer to page F 125)
Open ctcuil in wking lrom PA presslfe swilch lo ECU te|nrinal
'1P
Op€n circuil in wiring lrom P/S prcssure swilch to grcund
F - l 1 5