Shift Concerns: No 1-2 Shift (Automatic)

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SHIFT CONCERNS: NO 1-2 SHIFT (AUTOMATIC)

Possible Component	Reference/Action
220 - ELECTRICAL ROUTINE
Powertrain Control System	-
Electrical inputs/outputs, vehicle wiring harnesses, powertrain control module, shift solenoids, transmission range (TR) sensor	Run On-Board Diagnostics Tests. Refer to INTRODUCTION - GASOLINE . GO to PINPOINT TEST A and GO to PINPOINT TEST D .
320 - HYDRAULIC/MECHANICAL ROUTINE
Incorrect Pressures	-
Line pressure	Check pressure at line tap. Carry out Line Pressure and Stall Speed Tests. Refer to SPECIAL TESTING PROCEDURES . If not OK, check the following component: main control.
Main Control	-
Bolts out of torque specification	Adjust bolts to specification.
Gaskets damaged	Inspect for damage. Install new as necessary.
1-2 shift valve, 2-4 accumulator, main regulator valve stuck, damaged or misassembled	Inspect for damage. Install new as necessary.
SSA not functioning correctly	Inspect for damage. Activate solenoid using the Transmission Tester.
Pressure tap plate/gasket damaged	Inspect for damage. Install new as necessary.
Separator plates damaged	Inspect for damage. Install new as necessary.
Hydraulic passages damaged	Inspect for damage. Install new as necessary.
Intermediate Overdrive Band and Servo Assembly	-
NOTE: Also no 4th gear	-
Seals damaged, missing	Inspect for damage. Install new as necessary.
Piston damaged	Inspect for damage. Install new as necessary.
Band damaged	Inspect for damage. Install new as necessary.
Springs damaged	Inspect for damage. Install new as necessary.
Servo rod or rod bore damaged	Inspect for damage. Install new as necessary.
Low One-Way Clutch Assembly	-
Assembly	Inspect for damage. Install new as necessary.
OD/Reverse Sun Gear and Shell	-
Damaged, weld broken	Inspect for damage. Install new as necessary.
Lugs damaged	Inspect for damage. Install new as necessary.
Case	-
Low and intermediate band anchor area damaged	Inspect for damage. If damaged, install a new case.
Porosity/leakage in servo apply, servo release circuits	Inspect the case for leakage/porosity. Carry out Air Pressure Tests. Refer to SPECIAL TESTING PROCEDURES . Install a new case as required.