Product Overview
The ATSG GM 4L60E/65E/70E & 4L80E/85E Diagnostic Code Book is designed to provide the technician with a step by step diagnosis to each and every transmission code available from 1991 to 2007 model year. Preliminary Electrical Checks....................................................................................................................................... 3 Vehicle Identification....................................................................................................................................... 5 Scan Tips....................................................................................................................................... 7 Data Link Connector Terminal Identification..................................................................................................................................... 10 OBD-I Codes & Definitions..................................................................................................................................... 11 OBD-II Codes & Definitions..................................................................................................................................... 13 Code Criteria..................................................................................................................................... 17 Computer Locations..................................................................................................................................... 18 Computer Connector Configurations..................................................................................................................................... 19 Engine RPM Sensor - Loss of Signal..................................................................................................................................... 26 Engine Coolant Temperature Sensor.................................................................................................................................... 31 Transmission Input Speed Sensor.................................................................................................................................... 36 Loss of Vehicle Speed Signal (2 Wheel Drive)..................................................................................................................................... 40 Loss of Vehicle Speed Signal (4 Wheel Drive)..................................................................................................................................... 49 Four Wheel Drive Low Electrical Circuit Fault..................................................................................................................................... 54 Throttle Position Sensor.................................................................................................................................... 56 Accelerator Pedal Position Sensor (Diesel)..................................................................................................................................... 59 Malfunction Indicator/Service Throttle Soon Lamp Circuit Fault..................................................................................................................................... 64 Throttle Actuator Control (Gasoline)..................................................................................................................................... 66 Transmission Fluid Pressure Switch Fault..................................................................................................................................... 78 Transmission Range Switch Error.................................................................................................................................... 83 Transmission Fluid Temp Sensor Fault..................................................................................................................................... 87 Torque Convertor Stator Temperature Switch Fault..................................................................................................................................... 92 Brake Switch Circuit Malfunction..................................................................................................................................... 95 Torque Converter Clutch “Stuck Off”..................................................................................................................................... 97 Torque Converter Clutch “Stuck On”.................................................................................................................................... 101 TCC Enable Solenoid Electrical Circuit Fault.................................................................................................................................... 106 Pressure Control Solenoid Electrical Circuit Fault.................................................................................................................................... 108 TCC PWM Solenoid Electrical Circuit Fault..................................................................................................................................... 112 3-2 Solenoid Electrical Circuit Fault..................................................................................................................................... 116 1-2/2-3 Shift Solenoids Electrical Circuit Fault..................................................................................................................................... 119 1-2/2-3 Shift Solenoids Performance Malfunction.................................................................................................................................... 125 Undefined Gear Ratio/Incorrect Gear Ratio.................................................................................................................................... 131 Transmission Component Slipping.................................................................................................................................... 138 Maximum Shift Adapt Exceeded.................................................................................................................................... 145 Top Dead Center Offset Error................................................................................................................................... 150 System Voltage Malfunctions.................................................................................................................................... 153 PCM/TCM Control Module Faults.................................................................................................................................... 160 Traction Control Circuit Active.................................................................................................................................... 162 Transmission Preference Switch (Tow/Haul) Circuit Input Low................................................................................................................................... 163 Auxiliary Transmission Fluid Pump Relay Circuit Fault.................................................................................................................................... 165 Shift Stabilization.................................................................................................................................... 170 Second Gear Start Switch.................................................................................................................................... 171 Performance Mode Switch.................................................................................................................................... 174 Cruise Control Input.................................................................................................................................... 176 “U” Codes Definitions.................................................................................................................................... 178 Diagnostic Tips.................................................................................................................................... 181 Acronyms/Diagnostic Equipment Manufactures/Electrical Values.................................................................................................................................... 182 Electrical Equations.................................................................................................................................... 184
