Engagement Concern: No Reverse Only

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ENGAGEMENT CONCERN: NO REVERSE ONLY

Possible Component	Reference/Action
202 - ELECTRICAL ROUTINE
Powertrain Control System	-
Electrical inputs/outputs, vehicle wiring harnesses, powertrain control module, SSA on, transmission range (TR) sensor	Run On-Board Diagnostics tests. Refer to INTRODUCTION - GASOLINE for diagnosis . GO to PINPOINT TEST A and GO to PINPOINT TEST D .
302 - HYDRAULIC/MECHANICAL ROUTINE
External Shift Linkage	-
Damaged, out of adjustment	Inspect and repair as necessary. Verify linkage adjustment. Refer to AUTOMATIC TRANSAXLE-TRANSMISSION EXTERNAL CONTROLS - CD4E . After repairing linkage, verify that the transmission range (TR) sensor is correctly adjusted.
Incorrect Pressures	-
Low line pressure	Check pressure at line pressure tap. Carry out Line Pressure and Stall Speed Tests. Refer to SPECIAL TESTING PROCEDURES . If pressure is low, check the following possible components: main control, pump assembly, reverse clutch assembly, low/reverse clutch assembly.
Internal Shift Linkages	-
Damaged, disconnected	Inspect and service as required. If servicing the linkage, verify that the TR sensor is correctly adjusted. Refer to TRANSMISSION RANGE (TR) SENSOR .
Main Controls	-
Bolts out of torque specification	Adjust bolts to specification.
Gasket damaged	Inspect for damage. Repair as necessary.
1-2 shift valve, SSA, main regulator valve, low/reverse modulator valve, low/reverse accumulator piston, pressure tap plate damaged, missing, stuck, misassembled	Inspect for damage. Repair as necessary.
Separator plates damaged	Inspect for damage. Repair as necessary.
Hydraulic passages damaged	Inspect for damage. Repair as necessary.
Pump Assembly	-
Bolts out of torque specification	Adjust bolts to specification.
Gasket damaged	Inspect for damage. Install new as necessary.
Porosity/cross leaks all plug missing or leaking, plugged hole	Install a new pump assembly.
Pump support seal rings, No. 6 or No. 7, damaged	Inspect for damage. Repair as necessary.
Reverse Clutch Assembly	-
-	Carry out Air Pressure Test.
Seals, piston damaged	Inspect for damage. Repair as necessary.
Ball check valve damaged	Inspect for damage. Repair as necessary.
Friction elements worn, severely damaged or misassembled	Inspect for damage. Repair as necessary.
Piston return spring damaged	Inspect for damage. Repair as necessary.
Reverse clutch hub to forward/coast/direct hub splines damaged	Inspect for damage. Repair as necessary.
Low/Reverse Clutch Assembly	-
-	Carry out Air Pressure Test.
Seals or piston damaged	Inspect for damage. Repair as necessary.
Friction elements worn or severely damaged	Inspect for damage. Repair as necessary.
Piston return spring damaged	Inspect for damage. Repair as necessary.
Wave springs missing	Inspect for damage. Repair as necessary.
Piston bore damaged	Inspect for damage. Repair as necessary.
Forward/Coast/Direct Clutch Cylinder	-
Reverse seal rings damaged, missing, misassembled	Inspect for damage. Repair as necessary.
Case	-
Reverse to low/reverse clutch feeds have severe cross-leakage or porosity	Carry out Air Pressure Test. Inspect for damage. Repair as necessary.
Reverse/Overdrive Gear Set	-
Damaged	Inspect for damage. Repair as necessary.