4L60E/65E/70E- 4L80E/85E DIAGNOSTIC CODE BOOK …

1 AUTOMATIC TRANSMISSION SERVICE GROUP18635 SW 107 , FL 33157 Telephone (305) 670-4161 - Fax (305) 670-4162 - information and part numbers contained in this booklet havebeen carefully compiled from industry sources known for theirreliability, bur ATSG does not guarantee its Compiled by Pete LubanCopyright ATSG 2007 Portions of materials contained herein have been reprinted under license from General Motors Corp, Service & OperationsLicense Agreement Number GM 4L60E/65E/70E- 4L80E/85E DIAGNOSTIC Code Book is designed to provide the technician with a step by step DIAGNOSTIC approach to each and every transmission code available from 1991 to the 2007 model year.

2 This manual can be used in collusion with any type of scanner utilized in retrieving these codes from the computer. As an aid to the technician, component location is recognized throughout the diagnostics are included as well as a wealth of tips and tricks discovered over the years by the ATSG tech manual was compiled with the professional technician in mind, therefore a basic electrical knowledge is necessary, especially when it comes to vehicles equipped with a hybrid special thanks to all the technicians who offered feedback on fixes that helped in the compilation of this 4L80E/85E DIAGNOSTIC CODE BOOK1ED KRUSETECHNICAL CONSULTANTJIM DIALTECHNICAL CONSULTANTGREGORY LIPNICKTECHNICAL CONSULTANTJERRY GOTTTECHNICAL CONSULTANTPETE LUBANTECHNICAL CONSULTANTWAYNE COLONNATECHNICAL CONSULTANTDAVID CHALKERTECHNICAL CONSULTANTRICHARD GRAHAMTECHNICAL CONSULTANTGERALD CAMPBELLTECHNICAL CONSULTANTJON GLATSTEINTECHNICAL CONSULTANTROLAND ALVAREZTECHNICAL CONSULTANTMIKE SOUZATECHNICAL CONSULTANT4L60E/65E/70 E.

3 4L80E/85E CODE BOOKINDEXP reliminary Electrical Link Connector Terminal Codes & Codes & Connector RPM Sensor - Loss of Coolant Temperature Input Speed of Vehicle Speed Signal (2 Wheel Drive)..Loss of Vehicle Speed Signal (4 Wheel Drive)..Four Wheel Drive Low Electrical Circuit Position Pedal Position Sensor (Diesel)..Malfunction Indicator/Service Throttle Soon Lamp Circuit Actuator Control (Gasoline)..Transmission Fluid Pressure Switch Range Switch Fluid Temp Sensor Convertor Stator Temperature Switch Switch Circuit Converter Clutch Stuck Off ..Torque Converter Clutch Stuck On ..TCC Enable Solenoid Electrical Circuit Control Solenoid Electrical Circuit PWM Solenoid Electrical Circuit Solenoid Electrical Circuit Shift Solenoids Electrical Circuit Shift Solenoids Performance Gear Ratio/Incorrect Gear Component Shift Adapt Dead Center Offset Voltage Control Module Control Circuit Preference Switch (Tow/Haul)

4 Circuit Input Transmission Fluid Pump Relay Circuit Gear Start Mode Control U Codes Equipment Manufactures/Electrical 3 5 7 10 11 13 17 18 19 26 31 36 40 49 54 56 59 64 66 78 83 87 92 95 97 101 106 108 112 116 119 125 131 138 145 150 153 160 162 163 165 170 171 174 176 178 181 182 1842 AUTOMATIC TRANSMISSION SERVICE GROUPT echnical Service InformationPRELIMINARY ELECTRICAL CHECKSWhen diagnosing an electrically generated problem, the DIAGNOSTIC procedure should always begin with verifying the vehicles power supply and ground systems. A battery in a poor state of charge can cause an electronically controlled transmission to not perform as it should.

5 Begin by checking the battery state of charge as shown in Figure 1 1 STEP 1 STEP 3 Next, charging system voltage should be verified to manufacturers specs to insure proper alternator output is present as shown in Figure 3. It is also recommended that intermittent voltage spikes do not exist, which can cause erratic and unusual electrical problems which could effect normal transmission operation especially when pressure control solenoid codes are , with the engine running, place the negative meter lead to the negative battery POST, and the positive meter lead to the ground wire in question, volts or 300 millivolts or less should be seen as illustrated in Figure 2.

6 Any voltage reading higher than this requires would be a good time to correct any battery cable problems that : When checking ground points where more than one ground wire terminates, do not place the meter lead at the ground attachment point because if one of the other ground wires are good, the one in question will also check good. Probe the wire of the ground circuit in 2 OPEN POST BATTERY 3 CHARGING SYSTEM VOLTAGE DROP GROUND TEST3 AUTOMATIC TRANSMISSION SERVICE GROUPT echnical Service InformationFigure 2 NOTE: Typically VDCmaximum @ 70 withno load at 1500 to 2000engine rpm unlessotherwise W PRELIMINARY ELECTRICAL CHECKSSTEP 5 Next, check power and ground at the computer by back probing the computer connector.

7 Battery or charging system voltage should be approximately the same as the readings seen at the battery or alternator. (See Figure 5)The ground readings should be or 200 millivolts or 5 COMPUTER POWER & GROUND TESTF igure 6 TERMINAL TO WIRE CONTINUITY TESTIn order to verify the integrity of the wire end connection at the crimp, carefully place one meter lead into the cavity opening and the other meter lead into the wire behind the connector with the DVOM set to OHMS( )as seen in Figure : If it becomes necessary to probe into the connector cavity opening, be careful not to expand the cavity opening which could result in poor contact with its connector NOTE.

8 Sometimes simply unplugging a connector to a sensor, solenoid or computer and reconnecting it, can eliminate a symptom or 6W W operation can be impaired as well as internal damage of bushings, washers and other hard parts such as pump rotors, gears or planet with the engine running, place the negative meter lead to a good KNOWN ground, and the positive lead to the transmission case, as seen in Figure 4. The maximum allowable voltage should not exceed VDC or 300 millivolts. If the voltage seen is excessive, one or more ground straps may be GROUND TESTSTEP 4 Figure 44 AUTOMATIC TRANSMISSION SERVICE GROUPT echnical Service InformationWhen scanning for codes and data, it is in most cases, necessary to identify the model year, division, engine size and body style which are identified by the 10th, 3rd, 8th and 4th for Cars or 5th for Trucks, digits of the Vehicle Identification Number (VIN) respectively, which is the Model Year, Car/Truck Division, Engine and Body identification YEAR ID CODE (10TH VIN DIGIT)

9 YEARCODEYEARCODEYEARCODE1991199219931994 199519961997 MNPRSTV1998199920002001200220032004 WXY123420052006200720082009201056789 AFigure 75 VEHICLE IDENTIFICATIONF igure 8 CAR DIVISION CODE (3RD VIN DIGIT)CODECODE12345678 DIVISIONCHEVROLETPONTIACOLDSMOBILEBUICKD IVISIONPONTIACINCOMPLETECADILLACGM-CANAD ASATURNF igure 9LT. TRUCK DIVISION CODE (3RD VIN DIGIT)CODECODEABCDJKLMDIVISIONCHEV BUS* chev TRUCKDIVISIONCHEVROLETINCOMPLETEGMC MPVGMCINCOMPLETEEHNTCADILLACINCOMPLETEOL DS MPVGMC BUS*BUICKINCOMPLETEPONTIAC MPVCHEV MPVGMC TRUCK*VAN WITH 4TH SEATMED. TRUCK DIVISION CODE (3RD VIN DIGIT)CODEBCDDIVISIONCHEVROLET INCOMPLETEF igure 10 TCHEVROLET TRUCKGMC INCOMPLETEGMC TRUCKThe chart in Figure 7 lists the Model Year and the corresponding code which is represented by the 10th digit of the chart in Figure 8 lists car division code and the corresponding car division that built the vehicle.

10 The Car Division Code is represented by the 3rd digit of the chart in Figure 9 lists the light truck division code and the corresponding light truck division that built the vehicle. The Light Truck Division code is represented by the 3rd digit of the VIN. The chart in Figure 10 lists the medium truck division code and the corresponding medium truck division that built the vehicle. This is necessary when working on the Chevy Forward and GMC Tiltmaster that are equipped with a gasoline engine and the 4L80E transmission. The Medium Truck Division code is represented by the 3rd digit of the : In some instances the scan tool may have difficulty interfacing with the computer because it was built as an incomplete model either in the USA or 2nd digit of the VIN indicates where it was built as follows: "G"= GM; "K" = ISUZU-US BUILT; "J" = JAPAN BUILT.