2010 Cadillac CTS Sedan AWD V6-3.6L Page 1657
Module Assembly Cleaning) , to dislodge debris and free up the valves.
4. Engine idling in Park, verify with a scan tool the Transmission ISS/OSS supply voltage test status parameter displays OK.
5. Engine idling in Park. Observe the Transmission ISS parameter on the scan tool, while varying the engine speed. The Transmission ISS
parameter should vary with engine speed and not drop out.
6. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission OSS parameter on the scan tool. The Transmission OSS
parameter should vary with the vehicle speed and not drop out.
Note: Perform a scan tool snapshot, during the road test.
7. Perform the Road Test (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Initial Inspection and
Diagnostic Overview/Road Test). Verify the transmission operation performs as indicated, in the road test instructions.
8. Review the Tech 2 snapshot transmission data parameters. Verify the engine and transmission data parameters display the correct values in
all forward gear ranges:
* Engine Speed
* Engine Coolant Temperature
* Transmission ISS
* Transmission OSS
* Vehicle Speed
* Transmission Fluid Temperature
* Brake Pedal Switch
* TCC Pressure Control Solenoid Valve Pressure Command
* TCC Duty Cycle
* TCC Slip Speed
9. Operate the vehicle within the Condition for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Perform the Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component
Tests and General Diagnostics/Line Pressure Check). Verify the transmission line pressures are within the specified ranges.
瀚慖f not within the specified ranges, refer to Fluid Pressure High or Low (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Testing and Inspection/Symptom Related Diagnostic Procedures/Fluid Pressure High or Low).
2. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly
Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids - Transmission and
Drivetrain/Actuators and Solenoids - A/T/Shift Solenoid/Service and Repair).
3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (See: Transmission and
Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/Control Solenoid Valve and
Transmission Control Module Assembly Solenoid Performance Test). Test all solenoids on the Q8 control solenoid valve assembly. A
pressure change should occur for each solenoid.
瀚慖f the Q8 control solenoid valve assembly does not pass the performance test, replace the Q8 control solenoid valve assembly.
4. Listed in the chart below are conditions for each component that could set DTC P0741 or P0742. Carefully inspect each component for that
condition. Repair or replace as necessary.
