2010 Cadillac Truck SRX FWD V6-3.0L Page 1717

2010 Cadillac Truck SRX FWD V6-3.0L Page 1717

P0741

* DTC P0741 is a Type B DTC.

* Deviation between Engine speed and output speed is less than 30 RPM during lockup control is turned on.

* DTC P0742 is a Type B DTC.

* Deviation between Engine speed and output speed is more than 100 RPM during lockup control is turned off.

Diagnostic Aids

Ensure the transmission fluid level, color and odor is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those

first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams/Electrical

Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Description and Operation

Transmission Component and System Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/AF40-6 - Automatic Transmission/Transmission Component and System Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Operate the vehicle in drive with the calculated throttle position greater than 8% and ensure TCC is commanded ON and OFF a minimum of 5

times.

Verify the DTC does not reset. If the DTC resets and no other DTC is set, go to Circuit/System Testing.

If any other DTC is set, diagnose that DTC first.

Circuit/System Testing

Dynamic Test

1. Perform the line pressure check. Refer to Line Pressure Check (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/AF40-6 - Automatic Transmission/Line Pressure

Check).

2. Perform the transmission fluid check. Refer to Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/AF40-6 - Automatic Transmission/Transmission

Fluid Level and Condition Check).

3. If all circuits test normal, replace the K71 Transmission Control Module. Verify the DTC does not reset.

瀚慖f the DTC resets, go to Component Testing.

Component Testing

Static Test

1. Inspect the valve body assembly for a stuck valve, debris, or damage.

瀚慖f a stuck open or closed valve is found, replace the valve body assembly.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1651

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1651

P0741

DTC P0741 or P0742

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0741

- Torque Converter Clutch (TCC) - Stuck Off

DTC P0742

- Torque Converter Clutch (TCC) - Stuck On

Circuit/System Description

The torque converter clutch (TCC) pressure control (PC) solenoid is part of the control solenoid valve assembly which has no serviceable parts.

The TCC PC solenoid is a normally low pressure control solenoid. The TCC PC solenoid regulates transmission fluid to the TCC regulator valve in

the lower valve body and the TCC control valve in the pump cover. When vehicle operating conditions are appropriate to apply the converter

clutch, the transmission control module (TCM) will increase TCC PC current flow (duty cycle) to the TCC solenoid. The TCC PC solenoid directs

fluid pressure to move the TCC control valve to the apply position, and moves the TCC regulator apply valve to the regulating position. The TCC

regulator valve regulates TCC apply fluid pressure proportional to TCC solenoid pressure. When the TCC is fully applied, the engine is coupled

directly to the transmission. TCC release is accomplished by the TCM decreasing current flow to the TCC PC solenoid. This results in decreasing

the apply pressure which allows the TCC control valve to move to the release position. The TCM calculates torque converter slip speed based on

engine speed and transmission input shaft speed.

Conditions for Running the DTC

P0741

* DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0722, P0723, P0742, P2762, P2763, or P2764 are not set.

* Ignition voltage is 8.6 volts or greater.

* The engine run time is greater than 5 seconds.

* The transmission fluid temperature (TFT) is 20-130掳C (68-266掳F).

* The accelerator pedal position signal is valid.

* The throttle position is greater than 8 percent.

* The TCM must receive a valid torque signal from the ECM.

* The engine torque is greater than 50 Nm (36 lb ft).

* The TCC is commanded ON and PWM duty cycle is greater than 60 percent for 5 seconds.

* The following 6L80/6L90 gear ratios are achieved in the specified gear range while the TCC is commanded On:

- The 2nd gear ratio is between 2.19-2.52.

- The 3rd gear ratio is between 1.42-1.63.

- The 4th gear ratio is between 1.07-1.23.

- The 5th gear is between 0.79-0.91.

- The 6th gear is between 0.62-0.71.

* The following 6L50 gear ratios are achieved in the specified gear range while the TCC is commanded On:

- The 2nd gear ratio is between 2.20-2.53.

- The 3rd gear ratio is between 1.44-1.65.

- The 4th gear ratio is between 1.07-1.23.

- The 5th gear is between 0.79-0.91.

- The 6th gear is between 0.62-0.72.

P0742

* DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0722, P0723, P0741, P0742, P1751, P2762, P2763, or P2764 are not

set.

* DTC P0742 has not passed this key ON.

* Ignition voltage is between 8.6-18.0 volts.

* The engine run time is greater than 5 seconds.

* The transmission fluid temperature (TFT) is 20-130掳C (68-266掳F).

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1613

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1613

P0741

* DTC P0741 is a Type B DTC.

* Deviation between Engine speed and output speed is less than 30 RPM during lockup control is turned on.

* DTC P0742 is a Type B DTC.

* Deviation between Engine speed and output speed is more than 100 RPM during lockup control is turned off.

Diagnostic Aids

Ensure the transmission fluid level, color and odor is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those

first.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams/Electrical

Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Description and Operation

Transmission Component and System Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/AF40-6 - Automatic Transmission/Transmission Component and System Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Operate the vehicle in drive with the calculated throttle position greater than 8% and ensure TCC is commanded ON and OFF a minimum of 5

times.

Verify the DTC does not reset. If the DTC resets and no other DTC is set, go to Circuit/System Testing.

If any other DTC is set, diagnose that DTC first.

Circuit/System Testing

Dynamic Test

1. Perform the line pressure check. Refer to Line Pressure Check (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/AF40-6 - Automatic Transmission/Line Pressure

Check).

2. Perform the transmission fluid check. Refer to Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/AF40-6 - Automatic Transmission/Transmission

Fluid Level and Condition Check).

3. If all circuits test normal, replace the K71 Transmission Control Module. Verify the DTC does not reset.

瀚慖f the DTC resets, go to Component Testing.

Component Testing

Static Test

1. Inspect the valve body assembly for a stuck valve, debris, or damage.

瀚慖f a stuck open or closed valve is found, replace the valve body assembly.