TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 525 of 890
TM 9-2320-280-20-1 REFERENCE INFORMATION TRANSMISSION SYSTEM (4L80-E) The following chart will help you find the code you need. The J1 cable diagnostics checks (page 2-428) must be performed. Always correct the lower code number first. If code 51 shows up, replace TCM (para. 4-42), operate vehicle, and recheck for trouble codes. TROUBLE CODE 21 22 24 28 37 38 39 51 52 53 58 59 68 69 71 73 74 75 79 81 82 83 85 86 87 CIRCUIT Throttle Position High Throttle Position Low Transmission Output Speed Sensor (TOSS) Transmission Range Pressure Switch Torque Converter Clutch (TCC) Brake Switch Stuck “ON” TCC Brake Switch Stuck “OFF” TCC Stuck “OFF” Transmission Control Module (TCM) Bad System Voltage High Long System Voltage High Transmission Temperature High Transmission Temperature Low Transmission Component Slipping Torque Converter Clutch (TCC) Stuck “ON” Engine Speed Sensor Circuit Low Pressure Control Solenoid (PCS) Current Transmission Input Speed Sensor (TISS) Circuit System Voltage Low Transmission Fluid Overtemp 2-3 Shift Solenoid Circuit Fault 1-2 Shift Solenoid Circuit Fault TCC Solenoid (PWM) Circuit Fault Undefined Ratio Low Ratio High Ratio PAGE NO. 2-422 2-422 2-422 2-422 2-422 2-422 2-423 2-423 2-423 2-423 2-423 2-423 2-424 2-424 2-424 2-424 2-425 2-425 2-425 2-425 2-426 2-426 2-426 2-427 2-427 2-421