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Engagement Concern: No Reverse Only

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DIAGNOSTIC ROUTINES - 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
302 - HYDRAULIC/MECHANICAL ROUTINE 
External Shift Linkage   
  • Damaged, out of adjustment
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/ball 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.
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