Mazda 1990 323 Workshop Manual Supplement page 211

TROUBLESHOOTING GUIDE
6 NO SHIFT
DESCRIP-
l
Vehicle upshifts and downshifts in HOLD mode forward ranges only
TION
[TROUBLESHOOTING HINTS]
@ ATF level low
@ Hold switch circuit shorted
@ Throttle sensor malfunction or misadjustment
@ Pulse generator malfunction
@ Shift solenoid valve stuck (i-2, 2-3, or 3-4)
@ Control valve stuck (Pressure regulator valve, 1-2 shift
valve, 2-3 shift valve, 3-4 shift valve, or manual valve)
@ Oil pump worn
@ Hydraulic circuit clogged or leaking
w page K2-134
Between notches on HOT side of level
CT page K2-134
@ Clear pink: Normal condition
@ Dark or black (with friction material):
Worn powertrain components
@ Milky pink: Water contamination
@ Light to dark brown (Oxidation):
Overheated or old fluid
LT page K2-134
w page K2-106
Check for cause (Refer to specified
check sequence) w page K2-108
No Code No. displayed
Check main relay and voltage of termi-
nals 2Q and 2s of EC-AT control unit
between IC terminal of
unit and diagnosis con-
c3 If OK, replace EC-AT control unit
c3 If not OK, repair wiring
K2-35