Pontiac Fiero 1988 Service Manual page 753

125C-12 HYDRAULIC DIAGNOSIS
CONDITION
INSPECT COMPONENT FOR C A U S E
SHIFTS 1-3, MISSES 2ND
(Continued)
• Case
• Case Cover
• Intermediate Band
— Intermediate servo apply passage (2nd
oil) blocked.
— Intermediate servo apply passage (2nd
oil) blocked.
— Band improperly installed.
— Band burned/broken.
SHIFTS 3-1 AT HIGH
SPEEDS FOR PASSING
GEAR (Detent Downshifts)
• Governor
• Intermediate Servo
• Direct Clutch Orifice Con-
trolled by #2 Check Ball
• 1-2 Accumulator
— Cover worn.
— Thrust washer missing.
— Governor seal worn or cut.
— Governor spring not seated.
— Governor weights binding on pin.
— Ball missing.
— Governor driven gear stripped.
— Intermediate servo sticking.
— Restriction in orifice.
— Piston missing.
— Seal leaking.
NO FULL THROTTLE
(DETENT) DOWNSHIFT
• T.V. Cable
• Throttle Cable Assembly
• Control Valve Assembly
• Spacer Plate
— Misadjusted, unhooked, bound or broken.
— Not opening throttle sufficiently.
— Shift T.V. valve binding.
— T.V. valve binding.
— Spacer plate holes plugged.
— Gasket mispositioned or damaged.
NO OVERRUN BRAKING
IN LO (L1)
(Reverse OK)
• Manual Linkage
• Lo & Reverse Clutch
• Control Valve Assembly
— Misadjusted.
— Lo and reverse pipe leaking.
— Piston seals leaking.
— Lo blow off valve assembly damaged.
NO INTERMEDIATE
RANGE (2ND GEAR)
• Intermediate Servo
• Intermediate Band
• 1-2 Accumulator
— Oil seal ring missing or damaged.
— Band mispositioned, broken or burned.
— Accumulator piston or pin missing or
damaged.
H 125C-356
Figure 10 Diagnosis Chart