P0741
DTC P0741 or P0742
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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 components. 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
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P0742, P2763, or P2764 is not set.
* Engine speed is 400 RPM or greater for 5.0 seconds.
* Ignition voltage is 8.6 volts or greater.
* Transmission fluid temperature (TFT) is between 20 to +130°C (68-266°F).
* Throttle position is 8 percent or greater.
* Engine torque is 50 Nm (36 lb ft) or greater.
* 2nd gear ratio is between 2.67-3.07.
* 3rd gear ratio is between 1.71-1.97.
* 4th gear ratio is between 1.32-1.51.
* 5th gear is between 0.93-1.07.
* 6th gear is between 0.69-0.79.
* TCC is commanded ON.
* Engine torque signal is valid.
* Throttle position signal is valid.
P0742
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P0742, P2763, or P2764 is not set.
* Commanded range is 2nd gear or higher.
* Ignition voltage is 8.6 volts or greater.
* TFT is between 20 to +130°C (68-266°F).
* Throttle position is 8 percent or greater.
* Engine torque is 80 Nm (59 lb ft) or greater.
* Engine speed is 400 RPM or greater for 5 seconds.
* Vehicle speed is 16 km/h (10 mph) or greater.
* Engine speed is 500 RPM or greater
* Engine torque signal is valid.
* Throttle position signal is valid.
* TCC is commanded OFF.
Conditions for Setting the DTC
P0741
* TCC Pressure command is 500 kPa (73 psi) or greater for 2 seconds.
* TCM detects TCC slip 50 RPM or greater for 4 seconds when the TCC is commanded ON. This must occur 3 times.
P0742
TCM detects the TCC slip between -20 and +30 RPM for 2.5 seconds or greater when the TCC is commanded OFF. This must occur 6 times.
Action Taken When the DTC Sets
P0741
* DTC P0741 is a Type B DTC.
* TCM inhibits 6th gear.
* TCM inhibits TCC.
* TCM forces hot mode shift pattern.
P0742
* DTC P0742 is a Type A DTC.
* TCM freezes transmission adaptive functions.
* TCM forces hot mode shift pattern.
* TCM disables neutral idle.
Conditions for Clearing the DIC/DTC
P0741
DTC P0741 is a Type B DTC.
P0742
DTC P0742 is a Type A DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Transmission General Description Transmission General Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Review the TCM Freeze Frame/Failure Records to determine if DTC P0716 or P0717 was set.
• If DTC P0716 or P0717 was set
Diagnose that DTC first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
• If DTC P0716 or P0717 was not set
2. Verify correct transmission fluid level and condition. Refer to Transmission Fluid Level and Condition Check Testing and Inspection.
3. Ignition ON, clear the TCM DTCs.
4. Perform the Road Test Initial Inspection and Diagnostic Overview. Verify the transmission operation performs as indicated in the road test instructions and DTC P0741 or P0742 did not set.
• If DTC P0741 or P0742 sets
Refer to Circuit/System Testing below.
• If DTC P0741 or P0742 did not set
5. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
1. Perform the Line Pressure Check Line Pressure Check. Verify the transmission line pressures are within the specified ranges.
• If the line pressures are not within the specified ranges
Refer to Fluid Pressure High or Low Fluid Pressure High or Low.
• If the line pressures are within the specified ranges
2. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair
3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test 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.
• If a pressure change does not occur for each solenoid tested
Replace the Q8 control solenoid valve assembly.
• If a pressure change occurs for each solenoid
4. Listed in the table 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.
Repair Instructions
Note:
* Perform the Reset Transmission Adapts Reset Transmission Adapts following all transmission related repairs.
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Control Valve Lower Body and Upper Body Replacement Control Valve Lower Body and Upper Body Replacement
* Torque Converter Removal Torque Converter Removal
* Torque Converter Installation Torque Converter Installation
* Torque Converter and Differential Housing, Front Differential Transfer Drive Gear, and Front Differential Carrier Removal Torque Converter and Differential Housing, Front Differential Transfer Drive Gear, and Front Differential Carrier Removal and Torque Converter and Differential Housing Installation Torque Converter and Differential Housing Installation
* Control Module References Control Module References for control solenoid valve assembly replacement, setup, and programming