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Copyright © 2003 General Motors Corporation. All Rights Reserved.
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Welcome toWelcome toWelcome toWelcome to
Allison LCT 1000Allison LCT 1000Automatic Transmission Automatic Transmission
Diagnostic Close-upDiagnostic Close-upCourse # 17340.13DCourse # 17340.13D
Allison LCT 1000Allison LCT 1000Automatic Transmission Automatic Transmission
Diagnostic Close-upDiagnostic Close-upCourse # 17340.13DCourse # 17340.13D
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The material contained in The material contained in this course component this course component
was accurate and current was accurate and current at the time of course at the time of course
development.development.
The material contained in The material contained in this course component this course component
was accurate and current was accurate and current at the time of course at the time of course
development.development.
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Web SiteWeb SiteWeb SiteWeb Site
www.gmcommontraining.comwww.gmcommontraining.comwww.gmcommontraining.comwww.gmcommontraining.com
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In which of the following regionsis your dealership located?
A. AtlantaB. ChicagoC. DallasD. Los AngelesE. New York
In which of the following regionsis your dealership located?
A. AtlantaB. ChicagoC. DallasD. Los AngelesE. New York
Question 1Question 1Question 1Question 1
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Question 2Question 2Question 2Question 2
Which of the following best Which of the following best describes your experience level at describes your experience level at GM dealerships? GM dealerships?
A. Greater than 10 years A. Greater than 10 years
B. Between 5-10 years B. Between 5-10 years
C. Between 2-5 years C. Between 2-5 years
D. Less than 2 years D. Less than 2 years
Which of the following best Which of the following best describes your experience level at describes your experience level at GM dealerships? GM dealerships?
A. Greater than 10 years A. Greater than 10 years
B. Between 5-10 years B. Between 5-10 years
C. Between 2-5 years C. Between 2-5 years
D. Less than 2 years D. Less than 2 years
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Course Goal Course Goal Course Goal Course Goal
Apply concepts and procedures Apply concepts and procedures to diagnose an Allison LCT 1000 to diagnose an Allison LCT 1000 transmission. transmission.
Apply concepts and procedures Apply concepts and procedures to diagnose an Allison LCT 1000 to diagnose an Allison LCT 1000 transmission. transmission.
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Session ObjectivesSession ObjectivesSession ObjectivesSession Objectives Identify normal Allison LCT 1000Identify normal Allison LCT 1000
operational characteristics operational characteristics
Identify hydraulic and electronicIdentify hydraulic and electronic functions required for proper functions required for proper operation operation
Choose appropriate diagnosticChoose appropriate diagnostic strategy based upon observation strategy based upon observation of operating parameters of operating parameters
Identify normal Allison LCT 1000Identify normal Allison LCT 1000 operational characteristics operational characteristics
Identify hydraulic and electronicIdentify hydraulic and electronic functions required for proper functions required for proper operation operation
Choose appropriate diagnosticChoose appropriate diagnostic strategy based upon observation strategy based upon observation of operating parameters of operating parameters
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Clutch Application Chart Clutch Application Chart Clutch Application Chart Clutch Application Chart
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MAIN
BIAS PRESSURE
SPRING FORCE
MAIN FILTER
OVERAGE
OVERDRIVE KNOCKDOWN (NOT USED)
MAINPUMP
MAINREGULATOR
VALVE
TOCONVERTERFLOW VALVE
FROMTCC SIGNAL
OVERAGEMAINPump IntakeTCC Signal
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Question 3Question 3Question 3Question 3Which clutch is maintained by Which clutch is maintained by main pressure in steady state 4th main pressure in steady state 4th gear and 5th gear?gear and 5th gear? A. C1 A. C1
B. C2 B. C2
C. C3C. C3
D. C5D. C5
Which clutch is maintained by Which clutch is maintained by main pressure in steady state 4th main pressure in steady state 4th gear and 5th gear?gear and 5th gear? A. C1 A. C1
B. C2 B. C2
C. C3C. C3
D. C5D. C5
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Class 2 Data Line Class 2 Data Line
PCM PCM TCM TCM
CLASS 2 CLASS 2
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Factors Affecting Basic Factors Affecting Basic TCM Shift Control TCM Shift Control Factors Affecting Basic Factors Affecting Basic TCM Shift Control TCM Shift Control
Engine torque increasesEngine torque increases
Temperature changes Temperature changes
Engine torque increasesEngine torque increases
Temperature changes Temperature changes
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New/Reprogrammed TCM New/Reprogrammed TCM New/Reprogrammed TCM New/Reprogrammed TCM Adaptive values set to baseAdaptive values set to base
calibration calibration
Actual shift compared to anActual shift compared to an ideal shift ideal shift
TCM changes settings ofTCM changes settings of adaptive values closer to ideal adaptive values closer to ideal shift level shift level
Adaptive values set to baseAdaptive values set to base calibration calibration
Actual shift compared to anActual shift compared to an ideal shift ideal shift
TCM changes settings ofTCM changes settings of adaptive values closer to ideal adaptive values closer to ideal shift level shift level
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QuestionQuestionQuestionQuestion
Can you provide an explanation Can you provide an explanation of the LCT 1000 shift adapt of the LCT 1000 shift adapt strategy?strategy?
Can you provide an explanation Can you provide an explanation of the LCT 1000 shift adapt of the LCT 1000 shift adapt strategy?strategy?
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InputsInputsInputsInputs Throttle angle via PCMThrottle angle via PCM
NSBU switch (PNP)NSBU switch (PNP)
Pressure Switch AssemblyPressure Switch Assembly (PSA) (PSA)
TFT sensor TFT sensor
Throttle angle via PCMThrottle angle via PCM
NSBU switch (PNP)NSBU switch (PNP)
Pressure Switch AssemblyPressure Switch Assembly (PSA) (PSA)
TFT sensor TFT sensor
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Wiring HarnessWiring HarnessWiring HarnessWiring Harness
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QuestionQuestionQuestionQuestion
Which clutch has failed in the Which clutch has failed in the LCT 1000 and what caused LCT 1000 and what caused the failure? the failure?
Which clutch has failed in the Which clutch has failed in the LCT 1000 and what caused LCT 1000 and what caused the failure? the failure?
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QuestionQuestionQuestionQuestion
What will the customer’s What will the customer’s concern be with a failed C3 concern be with a failed C3 clutch?clutch?
What will the customer’s What will the customer’s concern be with a failed C3 concern be with a failed C3 clutch?clutch?
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Clutch Application Chart Clutch Application Chart Clutch Application Chart Clutch Application Chart
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DTC P1720/P0746 DTC P1720/P0746 DTC P1720/P0746 DTC P1720/P0746
““A” Trim Solenoid (controlledA” Trim Solenoid (controlledclutch not engaged)clutch not engaged)
““A” Trim Solenoid (controlledA” Trim Solenoid (controlledclutch not engaged)clutch not engaged)
Incorrect on-coming gearIncorrect on-coming gear ratio ratio
Defaults back to previousDefaults back to previous range range
Incorrect on-coming gearIncorrect on-coming gear ratio ratio
Defaults back to previousDefaults back to previous range range
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Clutch Circuit Leak Clutch Circuit Leak Clutch Circuit Leak Clutch Circuit Leak Clutch piston sealsClutch piston seals
Barrel component sealsBarrel component seals
Hydraulic passages in theHydraulic passages in the case and case components case and case components
Valve body and componentsValve body and components
Clutch piston sealsClutch piston seals
Barrel component sealsBarrel component seals
Hydraulic passages in theHydraulic passages in the case and case components case and case components
Valve body and componentsValve body and components
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Clutch Application Chart Clutch Application Chart Clutch Application Chart Clutch Application Chart
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QuestionQuestionQuestionQuestion
What is causing the C5 clutch What is causing the C5 clutch to slip?to slip?What is causing the C5 clutch What is causing the C5 clutch to slip?to slip?
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Hydraulic Default Test Hydraulic Default Test Hydraulic Default Test Hydraulic Default Test
Reverse: no gearReverse: no gear
33rdrd Gear: no gear Gear: no gear
Reverse: no gearReverse: no gear
33rdrd Gear: no gear Gear: no gear
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QuestionQuestionQuestionQuestion
Based on the results of the Based on the results of the hydraulic default test, what type hydraulic default test, what type of malfunction are we looking of malfunction are we looking for, and what should be our for, and what should be our next step?next step?
Based on the results of the Based on the results of the hydraulic default test, what type hydraulic default test, what type of malfunction are we looking of malfunction are we looking for, and what should be our for, and what should be our next step?next step?
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CausesCausesCausesCauses Massive leak in the mainMassive leak in the main
circuit circuit Pump damage: however, thisPump damage: however, this
will usually be accompanied by will usually be accompanied by noise noise
Something preventing theSomething preventing the pump from priming and pump from priming and pressurizing fluid pressurizing fluid
Massive leak in the mainMassive leak in the main circuit circuit
Pump damage: however, thisPump damage: however, this will usually be accompanied by will usually be accompanied by noise noise
Something preventing theSomething preventing the pump from priming and pump from priming and pressurizing fluid pressurizing fluid
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J46409
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DTCs DTCs DTCs DTCs
TCM: P0748TCM: P0748 TCM: P0748TCM: P0748
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QuestionQuestionQuestionQuestion
What types of circuit faults are What types of circuit faults are we looking for with this DTC?we looking for with this DTC?What types of circuit faults are What types of circuit faults are we looking for with this DTC?we looking for with this DTC?
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““A” Trim Solenoid A” Trim Solenoid Commanded Commanded ““A” Trim Solenoid A” Trim Solenoid Commanded Commanded
0% Duty Cycle Displayed 0% Duty Cycle Displayed 0% Duty Cycle Displayed 0% Duty Cycle Displayed
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Temperature vs Resistance SolenoidSump
TemperatureSump
TemperatureSolenoid A, B
ResistanceSolenoid C, D, E
ResistanceSolenoid FResistance
C F ohms ohms ohms
0 32 4.5 20.0 9.5
20 68 5.5 22.0 10.5
40 104 6.5 24.5 11.5
80 176 7.5 27.0 12.5
120 248 8.5 29.5 13.5
© Copyright General Motors Corporation. All Rights Reserved
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Temperature vs Resistance Speed Sensor
Temperature TemperatureMinimumResistance Nominal Resistance
MaximumResistance
C F k ohms k ohms k ohms
-25 -13 1.93 2.14 2.36
0 32 2.16 2.40 2.64
25 77 2.34 2.60 2.86
50 122 2.61 2.90 3.20
75 167 2.84 3.16 3.47
100 212 3.07 3.41 3.75
125 257 3.30 3.67 4.03
150 302 3.48 3.87 4.26
© Copyright General Motors Corporation. All Rights Reserved.
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Test Results Test Results Test Results Test Results
TFT @ 60º C (140º F)TFT @ 60º C (140º F)
“ “A” Trim Solenoid = 7A” Trim Solenoid = 7
TFT @ 60º C (140º F)TFT @ 60º C (140º F)
“ “A” Trim Solenoid = 7A” Trim Solenoid = 7
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Question 4Question 4Question 4Question 4Using the resistance versus Using the resistance versus temperature chart and the results of temperature chart and the results of testing, what do the results indicate? testing, what do the results indicate?
A. A. High resistance in the circuit High resistance in the circuit B. B. Low resistance in the circuit Low resistance in the circuit C. The solenoid windings are openC. The solenoid windings are openD. The resistance is within D. The resistance is within
specificationsspecifications
Using the resistance versus Using the resistance versus temperature chart and the results of temperature chart and the results of testing, what do the results indicate? testing, what do the results indicate?
A. A. High resistance in the circuit High resistance in the circuit B. B. Low resistance in the circuit Low resistance in the circuit C. The solenoid windings are openC. The solenoid windings are openD. The resistance is within D. The resistance is within
specificationsspecifications
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QuestionQuestionQuestionQuestion
If the resistance was too high, If the resistance was too high, where would you check for the where would you check for the high resistance and what high resistance and what would you be looking for? would you be looking for?
If the resistance was too high, If the resistance was too high, where would you check for the where would you check for the high resistance and what high resistance and what would you be looking for? would you be looking for?
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Question 5Question 5Question 5Question 5If CKT 1786 was shorted to ground If CKT 1786 was shorted to ground what type of fault would you look what type of fault would you look for?for?
A. PCM DTC storedA. PCM DTC storedB. TCM DTC storedB. TCM DTC storedC. Inoperative PRNDLC. Inoperative PRNDL
D. Incorrect engine operationD. Incorrect engine operation
If CKT 1786 was shorted to ground If CKT 1786 was shorted to ground what type of fault would you look what type of fault would you look for?for?
A. PCM DTC storedA. PCM DTC storedB. TCM DTC storedB. TCM DTC storedC. Inoperative PRNDLC. Inoperative PRNDL
D. Incorrect engine operationD. Incorrect engine operation
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TCM
RANGE RANGE RANGE RANGEA B C P
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Diagnostic ScenarioDiagnostic ScenarioDiagnostic ScenarioDiagnostic Scenario
Erratic shiftingErratic shifting
Sometimes the transmissionSometimes the transmission shifts to what seems to be an shifts to what seems to be an inappropriate gear inappropriate gear
Sometimes the transmissionSometimes the transmission shifts to neutral shifts to neutral
MIL on MIL on
Erratic shiftingErratic shifting
Sometimes the transmissionSometimes the transmission shifts to what seems to be an shifts to what seems to be an inappropriate gear inappropriate gear
Sometimes the transmissionSometimes the transmission shifts to neutral shifts to neutral
MIL on MIL on
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DTC P1711 Diagnostics DTC P1711 Diagnostics DTC P1711 Diagnostics DTC P1711 Diagnostics
“ “E” Switch Circuit: OKE” Switch Circuit: OK
Valve Body Inspection: Not Valve Body Inspection: Not Yet, per updated Yet, per updated diagnosticsdiagnostics
“ “E” Switch Circuit: OKE” Switch Circuit: OK
Valve Body Inspection: Not Valve Body Inspection: Not Yet, per updated Yet, per updated diagnosticsdiagnostics
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Question 6Question 6Question 6Question 6On a transmission that is On a transmission that is operating correctly, which operating correctly, which forward gear should be forward gear should be produced when the C1 produced when the C1 connector is removed? connector is removed?
A. 1st gear A. 1st gear B. 2nd gear B. 2nd gear C. 3rd gear C. 3rd gear D. 5th gear D. 5th gear
On a transmission that is On a transmission that is operating correctly, which operating correctly, which forward gear should be forward gear should be produced when the C1 produced when the C1 connector is removed? connector is removed?
A. 1st gear A. 1st gear B. 2nd gear B. 2nd gear C. 3rd gear C. 3rd gear D. 5th gear D. 5th gear
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Session Summary Session Summary Session Summary Session Summary
Identify Allison LCT 1000 andIdentify Allison LCT 1000 and operational characteristics operational characteristics
Identify electronic controls andIdentify electronic controls and functions functions
Describe strategic diagnostic pathDescribe strategic diagnostic path to servicing Allison LCT 1000 to servicing Allison LCT 1000
Identify diagnostic proceduresIdentify diagnostic procedures and service procedures and service procedures
Identify Allison LCT 1000 andIdentify Allison LCT 1000 and operational characteristics operational characteristics
Identify electronic controls andIdentify electronic controls and functions functions
Describe strategic diagnostic pathDescribe strategic diagnostic path to servicing Allison LCT 1000 to servicing Allison LCT 1000
Identify diagnostic proceduresIdentify diagnostic procedures and service procedures and service procedures
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Post-test Question 1Post-test Question 1Post-test Question 1Post-test Question 1
Which of the following clutches is used to hold the P3 ring gear stationary?
A. C1B. C2C. C4D. C5
Which of the following clutches is used to hold the P3 ring gear stationary?
A. C1B. C2C. C4D. C5
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Post-test Question 2Post-test Question 2Post-test Question 2Post-test Question 2
Which clutch could be malfunctioning if a truck is missing 4th and 5th gear?
A. C1B. C2C. C4D. C5
Which clutch could be malfunctioning if a truck is missing 4th and 5th gear?
A. C1B. C2C. C4D. C5
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Post-test Question 3Post-test Question 3Post-test Question 3Post-test Question 3
When an Allison transmission is replaced, the TCM should be ______.
A. replacedB. reset to base calibrationsC. reprogrammed to the “slow” adaptsD. re-learned to the PCM
When an Allison transmission is replaced, the TCM should be ______.
A. replacedB. reset to base calibrationsC. reprogrammed to the “slow” adaptsD. re-learned to the PCM
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Post-test Question 4Post-test Question 4Post-test Question 4Post-test Question 4
“VCM/Trans” listed on the Tech 2 Message Monitor identifies _____.
A. the TCM has stopped communicating
B. the TCM has a DTCC. the PCM class 2 data line is openD. the TCM is operating correctly
“VCM/Trans” listed on the Tech 2 Message Monitor identifies _____.
A. the TCM has stopped communicating
B. the TCM has a DTCC. the PCM class 2 data line is openD. the TCM is operating correctly
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Post-test Question 5Post-test Question 5Post-test Question 5Post-test Question 5
What will the shift adapt display if the TCM is still making large adjustments for a particular shift?
A. SlowB. FastC. ConvergedD. It will flash
What will the shift adapt display if the TCM is still making large adjustments for a particular shift?
A. SlowB. FastC. ConvergedD. It will flash
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Post-test Question 6Post-test Question 6When removing the TCM C1 connector, the transmission should provide which hydraulic default gears?
A. 1st and 3rdB. Reverse and 5thC. 3rd and 5thD. Reverse and 3rd
When removing the TCM C1 connector, the transmission should provide which hydraulic default gears?
A. 1st and 3rdB. Reverse and 5thC. 3rd and 5thD. Reverse and 3rd
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Post-test Question 7Post-test Question 7During a clutch test, the pressure drops and stays low and the turbine speed sensor increases and stays high. What does this indicate?
A. A hydraulic leakB. An electrical faultC. A damaged statorD. Normal operation
During a clutch test, the pressure drops and stays low and the turbine speed sensor increases and stays high. What does this indicate?
A. A hydraulic leakB. An electrical faultC. A damaged statorD. Normal operation
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Post-test Question 8Post-test Question 8
If you suspect that an Allison transmission is leaking, you should _________.
A. replace the transmissionB. replace the cooler linesC. add UV dye and leak checkD. perform clutch test
If you suspect that an Allison transmission is leaking, you should _________.
A. replace the transmissionB. replace the cooler linesC. add UV dye and leak checkD. perform clutch test
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Post-test Question 9Post-test Question 9Which NSBU circuit fault could cause an 8.1L engine to not exceed 3000 RPM and cause harsh shifts?
A. CKT #1786 shorted to groundB. CKT #1786 openC. TCM power supply shorted to
groundD. TCM power supply open
Which NSBU circuit fault could cause an 8.1L engine to not exceed 3000 RPM and cause harsh shifts?
A. CKT #1786 shorted to groundB. CKT #1786 openC. TCM power supply shorted to
groundD. TCM power supply open
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Post-test Question 10Post-test Question 10During a clutch test, in certain ranges the pressure drops and returns to normal and the turbine speed sensor increases and stays high. What does this indicate?
A. A hydraulic leakB. An electrical faultC. A slipping clutchD. Normal operation
During a clutch test, in certain ranges the pressure drops and returns to normal and the turbine speed sensor increases and stays high. What does this indicate?
A. A hydraulic leakB. An electrical faultC. A slipping clutchD. Normal operation
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Evaluation InstructionsEvaluation Instructions
Turn to evaluation module;Turn to evaluation module; remove and complete evaluation remove and complete evaluation
Use keypad to answer questionsUse keypad to answer questions
Turn to evaluation module;Turn to evaluation module; remove and complete evaluation remove and complete evaluation
Use keypad to answer questionsUse keypad to answer questions
Press the “Next Quest” keyPress the “Next Quest” key after each question after each question
Press “Yes” when completedPress “Yes” when completed
Press the “Next Quest” keyPress the “Next Quest” key after each question after each question
Press “Yes” when completedPress “Yes” when completed
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Evaluation Instructions cont.Evaluation Instructions cont.
Fill out back of evaluation formFill out back of evaluation form
Include today’s date, time and Include today’s date, time and time zone time zone
Fax to the Detroit IDL Center at Fax to the Detroit IDL Center at (586) 576-3319(586) 576-3319
Fill out back of evaluation formFill out back of evaluation form
Include today’s date, time and Include today’s date, time and time zone time zone
Fax to the Detroit IDL Center at Fax to the Detroit IDL Center at (586) 576-3319(586) 576-3319
Evaluation InstructionsEvaluation Instructions
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Thank you for attendingThank you for attendingThank you for attendingThank you for attending
Allison LCT 1000Allison LCT 1000Automatic Transmission Automatic Transmission
Diagnostic Close-upDiagnostic Close-upCourse # 17340.13DCourse # 17340.13D
Allison LCT 1000Allison LCT 1000Automatic Transmission Automatic Transmission
Diagnostic Close-upDiagnostic Close-upCourse # 17340.13DCourse # 17340.13D
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Copyright © 2003 General Motors Corporation. All Rights Reserved.
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