GM Service Manual Online
For 1990-2009 cars only
Table 1: Automatic Transmission Input Shaft Speed (AT ISS) Sensor
Table 2: Automatic Transmission Shift Selector (Allison® MD)
Table 3: Overdrive Defeat Switch (Allison® LCT)
Table 4: Park/Neutral Position (PNP) Switch (Allison® LCT)
Table 5: Transmission Control Module (TCM) C1 (Allison® LCT)
Table 6: Transmission Control Module (TCM) C2 (Allison® LCT)
Table 7: Transmission Control Module (TCM) C1 (Allison® MD)
Table 8: Transmission Control Module (TCM) C2 (Allison® MD)
Table 9: Transmission Control Module (TCM) C3 (Allison® MD)
Table 10: Turbine Shaft Speed (TSS) Sensor (Allison® LCT)
Table 11: Vehicle Speed Sensor (VSS) (Allison® LCT)
Table 12: Vehicle Speed Sensor (VSS) (Allison® MD)

Automatic Transmission Input Shaft Speed (AT ISS) Sensor


Object Number: 1548270  Size: CH

Connector Part Information

    • 15449024 Body
    • 15449028 Assembly
    • 2-Way F GT 150 3.2 Series, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

RD/BK

1230

AT ISS High Signal

B

D-BU/WH

1231

AT ISS Low Signal

Automatic Transmission Shift Selector (Allison® MD)


Object Number: 1391747  Size: CH

Connector Part Information

    • 15383243
    • 14-Way AMP, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

1

OG

1940

Battery Positive Voltage

2

L-BU

553

Tow/Haul Switch Signal

3

GY

598

5-Volt Reference

4

BK/WH

351

Ground

5

GY

8

Crank Voltage

6

--

--

Not Used

7

D-BU

1378

Transmission Shift Selector Display Signal

8

BK

450

Ground

9

D-GN

1373

Transmission Shift Selector Mode Signal

10

BK/WH

771

Transmission Range Switch Signal A

11

YE

772

Transmission Range Switch Signal B

12

L-GN

1371

Shift Data Bit 4

13

TN

2654

Shift Data Bit 8

14

WH

776

Transmission Range Switch Signal-Pariety Bit

Overdrive Defeat Switch (Allison® LCT)


Object Number: 40422  Size: CH

Connector Part Information

    • 12064762
    • 6-Way F Metri-Pack 150 Series (WH)

Pin

Wire Color

Circuit No.

Function

A

BK

750

Ground

B

BK

750

Ground

C

TN/WH

2678

Overdrive Defeat Switch Signal

D

PK

239

Ignition 1 Voltage

E

BN

2509

Left Rear Park Lamps Supply Voltage

F

TN/WH

2678

Overdrive Defeat Signal

Park/Neutral Position (PNP) Switch (Allison® LCT)


Object Number: 901402  Size: CH

Connector Part Information

    • 15411264 Body
    • 15411266 Assembly
    • 12-Way GT Mixed Series 150/280, Sealed (BU)

Pin

Wire Color

Circuit No.

Function

1

D-GN

1433

PNP/Clutch Start Switch Signal

2

--

--

Not Available

3

OG/BK

--

Not Used

4

YE

772

Transmission Range Switch Signal B

5

BK/WH

771

Transmission Range Switch Signal A

6

GY

773

Transmission Range Switch Signal C

7

BK/WH

251

Ground

8

WH

776

Transmission Range Switch Signal-Pariety Bit

9

--

--

Not Used

10

L-GN

24

Backup Lamp Supply Voltage

11

PK

139

Ignition 1 Voltage

12

PU

806

Crank Voltage

Transmission Control Module (TCM) C1 (Allison® LCT)


Object Number: 698666  Size: CH

Connector Part Information

    • 15305371
    • 32-Way F Micro-Pack 100 W (GY)

Pin

Wire Color

Circuit No.

Function

1

BK/WH

351

Ground

BK/WH

451

Ground (LLY)

2

PK

1020

Ignition 0 Voltage

3

OG

440

Battery Positive Voltage

4

PK

1020

Ignition 0 Voltage

5

BK/WH

351

Ground

BK/WH

51

Ground (LLY)

6

YE

2522

PTO Engaged Signal

7

PU

420

TCC Brake Switch/Cruise Control Release Signal (w/o LLY)

--

--

Not Used (LLY)

8

YE

1479

A/T Neutral Signal

9

WH

2467

Unmanaged Torque (L18)

--

--

Not Used (LLY)

10

TN/WH

2678

Overdrive Defeat Switch Signal

11

TN

1147

Transmission Shift Inhibit Signal

12

GY/BK

1694

4WD Low Signal (NP1)

--

--

Not Used (w/o NP1)

13-15

--

--

Not Used

16

TN/BK

464

Delivered Torque Signal (L18)

17-18

--

--

Not Used

19

L-BU

1480

Transmission Power Take-Off Enable Signal

20

--

--

Not Used

21

PU

1146

Engine Brake Enable Signal

22

OG/BK

463

Requested Torque Signal (L18)

23-24

--

--

Not Used

25

GY

1234

Do Not Shift Indicator Control

GY

2466

Do Not Shift Indicator Control (LLY)

26

--

--

Not Used

27

L-BU

2221

Signal High - Rear (NP1)

YE

400

VSS High Signal (w/o NP1)

--

--

Not Used (L18)

28

BK

407

Low Reference

29

YE

2361

SAE J1939 Serial Data Bus+

30

YE

2470

Class 2 Serial Data

31

--

--

Not Used

32

D-GN

2362

SAE J1939 Serial Data Bus-

Transmission Control Module (TCM) C2 (Allison® LCT)


Object Number: 698666  Size: CH

Connector Part Information

    • 15305371
    • 32-Way F Micro-Pack 100 W (RD)

Pin

Wire Color

Circuit No.

Function

1

PK

1224

Transmission Fluid Pressure Switch Signal A

2

D-BU

1225

Transmission Fluid Pressure Switch Signal B

3

RD

1226

Transmission Fluid Pressure Switch Signal C

4

L-GN/BK

2529

Transmission Fluid Pressure Switch Signal R

5

BK/WH

771

Transmission Range Switch Signal A

6

YE

772

Transmission Range Switch Signal B

7

GY

773

Transmission Range Switch Signal C

8

WH

776

Transmission Range Switch Signal-Pariety Bit

9

--

--

Not Used

10

YE/BK

1227

TFT Sensor Signal

11-12

--

--

Not Used

13

OG

1983

Transmission Turbine Speed Switch Signal

14

L-BU

1984

Transmission Turbine Speed Switch Low Reference

15

PU/WH

821

VSS High Signal

16

L-GN/BK

822

VSS Low Signal

17

RD/BK

1230

AT ISS High Signal

18

D-BU/WH

1231

AT ISS Low Signal

19

GY

1148

Transmission Shift Inhibit Signal

--

--

Not Used (L18/LG4/LLY)

20

BK

2762

Low Reference

21

PU

2471

Trans ID

22

RD/BK

1228

PC Solenoid Valve High Control (Sol. A) (LLY)

L-BU/WH

1229

PC Solenoid Valve Low Control (Sol. A) (w/o LLY)

23

RD/BK

1228

PC Solenoid Valve High Control (Sol. A) (w/o LLY)

L-BU/WH

1229

PC Solenoid Valve Low Control (Sol. A) (LLY)

24

PK/BK

2468

PC Solenoid Valve High Control (Sol. B)

25

BN/WH

2469

PC Solenoid Valve Low Control (Sol. B)

26

PU

898

Shift Solenoid A Valve Control (LLY)

L-GN

1222

Shift Solenoid A Valve Control (w/o LLY)

27

YE/BK

2879

Shift Solenoid D Valve Control (LLY)

YE/BK

1223

Shift Solenoid B Valve Control (w/o LLY)

28

OG/WH

2527

Shift Solenoid C Valve Control

29

WH

1994

Shift Solenoid C Valve Control (LLY)

BN

418

TCC PWM Solenoid Valve Control (w/o LLY)

30

D-BU

1530

Transmission Mainline Pressure Solenoid Control (LLY)

31

BN

323

12-Volt Reference

32

D-GN/WH

2528

Main Pressure Modulation

Transmission Control Module (TCM) C1 (Allison® MD)


Object Number: 698666  Size: CH

Connector Part Information

    • 15305371
    • 32-Way F Micro-Pack 100 W (GY)

Pin

Wire Color

Circuit No.

Function

1

TN/BK

1921

SAE J1587 Serial Data Bus+ Primary

2

--

--

Not Used

3

GY

598

5-Volt Reference

4

YE

2655

Ignition Sensor Signal

5

BK/WH

771

Transmission Range Switch Signal A

6

YE

772

Transmission Range Switch Signal B

7

L-GN

1371

Transmission Range Switch Signal C

8

TN

2654

Transmission Range Switch Signal P

9

WH

776

Transmission Range Switch Signal-Pariety Bit

10

D-GN

1373

Transmission Shift Selector Mode Signal

11-12

--

--

Not Used

13

YE

2361

SAE J1939 Serial Data Bus+

14

D-BU

1378

Transmission Shift Selector Display Signal

15

--

--

Not Used

16

RD/WH

1940

Battery Positive Voltage

17

WH/BK

1922

SAE J1708 Serial Data B

18-28

--

--

Not Used

29

D-GN

2362

SAE J1939 Serial Data Bus-

30

--

--

Not Used

31

GY

1234

Do Not Shift Indicator Control

32

L-BU

553

Tow/Haul Switch Signal

Transmission Control Module (TCM) C2 (Allison® MD)


Object Number: 698666  Size: CH

Connector Part Information

    • 15305371
    • 32-Way F Micro-Pack 100 W (RD)

Pin

Wire Color

Circuit No.

Function

1

RD/WH

440

Battery Positive Voltage

2

PU

1146

Engine Brake Enable Signal

3

--

--

Not Used

4

GY

1524

Backup Lamp Relay Control

5

--

--

Not Used

6

YE

1479

A/T Neutral Signal

7-10

--

--

Not Used

11

TN

1147

Transmission Shift Inhibit Signal

12

YE

1481

Transmission Auxiliary Hold Signal

13

YE

915

PTO Engage Signal

14-15

--

--

Not Used

16

RD/WH

440

Battery Positive Voltage

17

BK/WH

351

Ground

18

--

--

Not Used

19

GY

1148

Transmission Shift Inhibit Signal

20

L-BU

2221

Signal High - Rear

21

--

--

Not Used

22

L-BU

1480

Transmission Power Take-Off Enable Signal

23-25

--

--

Not Used

26

PK

1020

Ignition 0 Voltage

27-29

--

--

Not Used

30

YE

1479

A/T Neutral Signal

31

TN

476

Low Reference

32

BK/WH

351

Ground

Transmission Control Module (TCM) C3 (Allison® MD)


Object Number: 698666  Size: CH

Connector Part Information

    • 15305371
    • 32-Way F Micro-Pack 100 W (NA)

Pin

Wire Color

Circuit No.

Function

1

RD/BK

1525

12-Volt Reference

2

WH

1526

12-Volt Reference

3

D-GN

1531

12-Volt Reference

4

OG

1991

Shift Solenoid A Valve Control

5

PU

898

Shift Solenoid C Valve Control

6

OG/WH

2527

Shift Solenoid E Valve Control

7

WH

2880

Shift Solenoid G Valve Control

8

--

--

Not Used

9

D-GN

1313

5-Volt Reference

10-11

--

--

Not Used

12

RD

1226

Transmission Fluid Pressure Switch Signal C

13

PU

2471

Trans ID

14

RD/BK

1230

AT ISS High Signal

15

OG

1983

Transmission Turbine Speed Switch Signal

16

YE

400

Signal High - Front

17

L-GN

1527

12-Volt Reference

18-19

--

--

Not Used

20

PU

1992

Shift Solenoid B Valve Control

21

YE/BK

2879

Shift Solenoid D Valve Control

22

WH

1994

Shift Solenoid F Valve Control

23-24

--

--

Not Used

25

BK

407

Low Reference

26

WH

1971

Transmission Oil Level Sensor Signal

27

YE/BK

1227

TFT Sensor Signal

28-29

--

--

Not Used

30

D-BU/WH

1231

AT ISS Low Signal

31

L-BU

1984

Transmission Turbine Speed Switch Low Reference

32

PU

401

Signal Low - Front

Turbine Shaft Speed (TSS) Sensor (Allison® LCT)


Object Number: 1548270  Size: CH

Connector Part Information

    • 15449024 Body
    • 15449028 Assembly
    • 2-Way F GT 150 Series, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

OG

1983

Transmission Turbine Speed Switch Signal

B

L-BU

1984

Transmission Turbine Speed Switch Low Reference

Vehicle Speed Sensor (VSS) (Allison® LCT)


Object Number: 1548270  Size: CH

Connector Part Information

    • 15449024 Body
    • 15449028 Assembly
    • 2-Way F GT 150 Series, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

PU/WH

821

VSS High Signal

B

L-GN/BK

822

VSS Low Signal

Vehicle Speed Sensor (VSS) (Allison® MD)


Object Number: 1548270  Size: CH

Connector Part Information

    • 15449024 Body
    • 15449028 Assembly
    • 2-Way F GT 150 Series, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

YE

400

VSS High Signal

B

PU

401

VSS Low Signal