1 Copyright © 2003 General Motors Corporation. All Rights Reserved.

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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



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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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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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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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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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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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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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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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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?


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Which clutch could be malfunctioning if a truck is missing 4th and 5th gear?


Which clutch could be malfunctioning if a truck is missing 4th and 5th gear?


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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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“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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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

606059595858575756565555545453535252515150504949484847474646454544444343424241414040393938383737363635353434333332323131303029292828272726262525242423232222212120201919181817171616151514141313121211111010 99 88 77 66 55 44 33 22 11 00

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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

606059595858575756565555545453535252515150504949484847474646454544444343424241414040393938383737363635353434333332323131303029292828272726262525242423232222212120201919181817171616151514141313121211111010 99 88 77 66 55 44 33 22 11 00

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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





1 Copyright © 2003 General Motors Corporation. All Rights Reserved.

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