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 MANUALSCHEVROLET1993SPORTVAN G20, 5.7 KREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - 4L60-E
1993 Chevrolet Sportvan G20, 5.7 K
Diagnosis - 4L60-E
1993 Chevrolet Sportvan G20, 5.7 KSECTION Diagnosis - 4L60-E
- Application & Identification
- Description
- Operation
- Trouble Shooting
- Clutch & Band Application
- Symptom Diagnosis
- Notes
- Incorrect Shift Pattern
- Shift Quality
- Engine Rough
- Line Pressure Too High
- Line Pressure Too Low
- MIL Stuck On
- Erratic Manual Downshift
- Unwanted Downshift (Corvette Only)
- Wrong Gear, No Shift Or Two Gears Only
- Second Gear Start (Camaro & Firebird With V6 Engine Only)
- 3rd Gear Only
- Delayed 3-4 Upshift & TCC Apply During Hard Acceleration
- No 4th Gear Hot
- No TCC Apply
- TCC Apply Time Wrong
- Self-Diagnostics
- Component Test Charts (No Codes) - 1994
- Performance Tests
- Electronic Self-Diagnostics
- Diagnostic Charts
- Description
- Chart A-1 (CAMARO & Firebird W/4.3L)
- Chart A-1 (Brougham, Caprice, CAMARO, Corvette, Firebird & ROADMASTER W/5.7L)
- Chart A-2 (Brougham, Caprice, CAMARO, Corvette, Firebird & ROADMASTER W/5.7L)
- Chart A-1 - ("C", "G", "K", "L", "M", "S" & "T" W/Gas Engine)
- Chart A-2 ("C", "G", "K", "L", "M", "S" & "T" W/Gas Engine)
- Chart A-1 - ("C", "G" & "K" W/Diesel Engine)
- Chart A-2 - ("C", "G" & "K" W/Diesel Engine)
- Diagnostic Code Charts - (Passenger Vehicles)
- Code 11, Malfunction Indicator Light 5.7L "B", "D", "F" & "Y" Bodies
- Code 21, Throttle Position Sensor Signal Voltage High
- Code 22, Throttle Position Sensor Signal Voltage Low
- Code 24, Vehicle Speed Sensor - 3.4L "F" Body, 4.3L & 5.7L
- Code 28, Transmission Range Pressure Switch - 3.4L "F" Body, 4.3L & 5.7L
- Code 53, System OVERVOLTAGE - 3.4L "F" Body, 4.3L & 5.7L
- Code 58, Trans. Temperature Sensor High Temperature - 3.4L "F" Body, 4.3L & 5.7L
- Code 59, Trans. Temperature Sensor Low Temperature - 3.4L "F" Body, 4.3L & 5.7L "B", "D", "F" & "Y" Bodies
- Code 72, Vehicle Speed Sensor Loss - 3.4L "F" Body, 4.3L & 5.7L "B", "D" & "F" Bodies
- Code 72, Vehicle Speed Sensor Loss - 5.7L "Y" Body
- Code 73, Pressure Control Solenoid - 4.3L & 5.7L
- Code 75, Transmission Voltage Low - 4.3L & 5.7L
- Code 79, Transmission Fluid OVERTEMP - 3.4L "F" Body, 4.3L & 5.7L
- Code 80, Transmission Component Slipping - 3.4L "F" Body, 4.3L & 5.7L
- Code 81, 2-3 Shift Solenoid - 4.3L & 5.7L
- Code 82, 1-2 Shift Solenoid - 4.3L & 5.7L
- Code 84, 3-2 Control Solenoid - 4.3L & 5.7L
- Code 85, TCC Stuck On - 4.3L & 5.7L
- Code 90, TCC Solenoid Circuit - 3.4L "F" Body, 4.3L & 5.7L
- Code 93, Pressure Control Solenoid - 3.4L "F" Body
- Code 96, Transmission Voltage Low - 3.4L "F" Body
- Code 97, VSS Output Circuit - 4.3L & 5.7L
- Diagnostic Code Charts (Light Trucks & Vans)
- Code 16, Transmission Output Speed - 5.0L & 5.7L With 4L60E Transmission
- Code 21, TPS Signal Voltage High
- Code 22, TPS Signal Voltage Low
- Code 24, Vehicle Speed Signal Low
- Code 28, Pressure Switch Manifold Fault
- Code 58, Trans Fluid Temp. Sens CKT (High Temp. Indicated)
- Code 59, Transmission Fluid Temp. Sensor Circuit (Low Temp. Indicated)
- Code 66, 3-2 Control Solenoid Circuit Fault
- Code 67, TCC Solenoid Circuit Check
- Code 68, Overdrive Ratio Error
- Code 69, Torque Converter Clutch Stuck On
- Code 72, VSS CKT Loss Transmission Output Signal - Diesel
- Code 73, Force Motor Current (Current Error)
- Code 81, 2-3 Shift Solenoid Circuit Fault
- Code 82, 1-2 Shift Solenoid Circuit Fault
- Circuit Tests
- Component Tests
- 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.