2010 Cadillac CTS Sedan AWD V6-3.0L Page 1627
2. Connect the DT-47825-10 - jumper harness between the vehicle wire harness electrical connector, and the control solenoid valve assembly
electrical connector.
3. Ignition ON, test for 8.3-9.3 volts between the ISS/OSS voltage circuit terminal B on the Q8 control solenoid valve assembly and ground at
the transmission case.
瀚慖f not within the specified range, replace the control solenoid valve assembly.
4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test (See:
Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/Control
Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test).
5. Inspect the machined slots on the output shaft housing outer surface for damage or misalignment. Repair or replace as necessary.
6. If all of the above test normal, replace the B14A/B14C ISS/OSS assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Perform the Input and Output Speed Sensor Replacement (See: Powertrain Management/Transmission Control Systems/Sensors and
Switches - Transmission and Drivetrain/Sensors and Switches - A/T/Transmission Speed Sensor/Service and Repair).
* Control solenoid valve assembly - refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for
replacement, setup, and programming.
* Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test (See:
Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/Control
Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test).
* Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and
Inspection/Programming and Relearning/Service Fast Learn Adapts) following all transmission related repairs.
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.
