Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1988VAN BASE, VAN PASSENGERREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - A-43D/A-44D/A-45DF/A-45DL
1988 Toyota Van Base, Van Passenger
Overhaul - A-43D/A-44D/A-45DF/A-45DL
1988 Toyota Van Base, Van PassengerSECTION Overhaul - A-43D/A-44D/A-45DF/A-45DL
- Application
- Identification
- Description
- Lubrication & Adjustments
- Troubleshooting
- Preliminary Checks
- Fluid Discolored Or Smells Burnt
- No Movement In Any Forward Gear Or Reverse
- Shift Lever Position Incorrect
- Harsh Engagement Into Any Drive Range
- Delayed 1-2, 2-3 Or 3-Od Upshifts, Or Downshifts From Od-3 Or 3-2 Then Back To Od Or 3
- Slip On Any Upshift Or Slip Or Shudder On Takeoff
- Drag Or Binding On Upshifts
- Harsh Downshift
- No Downshift When Coasting
- Downshift Occurs Too Soon Or Too Late When Coasting
- No Od-3, 3-2 Or 2-1 KICKDOWN
- No Engine Braking In "2"
- Vehicle Does Not Hold In "P"
- No Lock-Up In Od
- On-Vehicle Service
- Testing
- Electrical Testing
- Overdrive Relay (A-43D, A-44D & A-45DL)
- Overdrive Solenoid (A-43D & A-44D)
- Overdrive Solenoid (A-45DL & A-45DF)
- Overdrive Off Indicator (A-43D, A-44D, A-45DL & A-45DF)
- Overdrive Main Switch Indicator (A-43D, A-44D, A-45DL & A-45DF)
- Overdrive Relay (A-45DL) Or AT Control Computer (A-45DF) & Solenoid (A-45DL).
- AT Control Computer (A-45DF)
- Thermoswitch (A-45DL & A-45DF)
- ATF Thermo Indicator Light (A-45DF)
- ATF Thermo Sensor (A-45DF)
- Road Test
- Time Lag Test
- Stall Test
- Hydraulic Pressure Tests
- Electrical Testing
- Removal & Installation
- Torque Converter
- Transmission Disassembly
- Component Disassembly & Reassembly
- Oil Pump
- Overdrive Planetary Gear, Overdrive Direct Clutch & Overdrive One Way Clutch (A-43D & A-44D)
- Overdrive Input Shaft & Clutch (A-45DL & A-45DF)
- Overdrive Brake
- Front Clutch
- Rear Clutch
- Center Support Assembly
- Planetary Gear Output Shaft
- No. 3 Brake Piston
- Lower Valve Body
- Upper Front Valve Body
- Upper Rear Valve Body
- Governor Body
- Transmission Reassembly
- Torque Specifications
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.