The PCM controls the torque converter clutch pulse width modulation (TCC PWM) solenoid valve. The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is fully applied, the engine is coupled directly to the transmission through the TCC.
The TCC used is an electronically controlled capacity clutch (ECCC). The PCM will normally allow a small amount of slip to occur with the ECCC. When the TCC is engaged, TCC slip speed is maintained at approximately 20 to 50 RPM.
If the PCM detects high torque converter slip when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.
This diagnostic procedure supports the following DTC:
DTC P0741 Torque Converter Clutch (TCC) System - Stuck Off
• | No VSS DTC P0502 or P0503. |
• | No ISS DTC P0716 or P0717. |
• | No TCC stuck ON DTC P0742. |
• | No TCC release switch DTC P1887. |
• | No TCC PWM solenoid valve DTC P2761. |
• | The engine speed is greater than 500 RPM for 5 seconds and not in fuel cut off. |
• | The engine torque is greater than 28 N·m (21 lb ft). |
• | The transmission fluid temperature is 20 to 130°C (68 to 266°F). |
• | The TP indicated angle is 4-99 percent. |
• | The IMS indicates D2, D3 or D4. |
• | The TCC duty cycle is 50 percent or greater. |
The TCC slip speed is 180 RPM or more for 7 seconds twice during the same ignition cycle.
• | The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met. |
• | The PCM inhibits TCC. |
• | The PCM inhibits 4th gear if the transmission is in Hot Mode. |
• | The PCM freezes transmission adaptive functions. |
• | The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records. |
• | The PCM stores DTC P0741 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met. |
• | The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes. |
• | A scan tool can clear the MIL/DTC. |
• | The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring. |
• | The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM. |
• | Prior to replacing the torque converter refer to the Torque Converter Replacement Guide . |
• | Residue or contamination may cause valves to stick intermittently. |
• | An intermittent short to voltage in the signal circuit may also set this DTC. |
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||||||||||||||||||||||||
2 | Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Check | ||||||||||||||||||||||||||||||||||
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear DTC Information function will erase the stored Freeze Frame and Failure Records from the PCM. Does the scan tool indicate the TCC Slip Speed is within the specified value? | -50 RPM to +180 RPM | Go to Diagnostic Aids | Go to Step 4 | |||||||||||||||||||||||||||||||||||
4 |
Refer to Automatic Transmission Inline 20-Way Connector End View . Does the test lamp turn ON and OFF? | -- | Go to Step 6 | Go to Step 5 | ||||||||||||||||||||||||||||||||||
5 | Test the control circuit of the TCC PWM Solenoid valve for a short to voltage between the PCM and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 | ||||||||||||||||||||||||||||||||||
6 |
Does the resistance measure within the specified range? | 10-15 ohms | Go to Step 7 | Go to Step 8 | ||||||||||||||||||||||||||||||||||
7 | Measure the resistance from the TCC PWM solenoid valve control circuit and all other terminals of the A/T inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs . Did you find a condition? | 10 K ohms | Go to Step 10 | Go to Step 11 | ||||||||||||||||||||||||||||||||||
8 |
Is the resistance within the specified range? | 10-15 ohms | Go to Step 10 | Go to Step 9 | ||||||||||||||||||||||||||||||||||
9 | Replace the TCC PWM Solenoid valve. Refer to Torque Converter Clutch Pulse Width Modulation Solenoid Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||||||||||||||||||||||||||||
10 | Replace the AT wiring harness assembly. Refer to Wiring Harness Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||||||||||||||||||||||||||||
11 |
Did you find and correct a condition? | -- | Go to Step 13 | -- | ||||||||||||||||||||||||||||||||||
12 | Replace the PCM. Refer to Control Module References . Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||||||||||||||||||||||||||||
13 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 14 | Go to Step 2 | ||||||||||||||||||||||||||||||||||
14 | With a scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |
The TCM controls the torque converter clutch pulse width modulation (TCC PWM) solenoid valve. The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is fully applied, the engine is coupled directly to the transmission through the TCC.
The TCC used is an electronically controlled capacity clutch (ECCC). The TCM will normally allow a small amount of slip to occur with the ECCC. When the TCC is engaged, TCC slip speed is maintained at approximately 20 to 50 RPM.
If the TCM detects high torque converter slip when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.
This diagnostic procedure supports the following DTC:
DTC P0741 Torque Converter Clutch (TCC) System - Stuck Off
• | No TP sensor DTC P0120 or P0220. |
• | No ISS DTC P0716 or P0717. |
• | No VSS DTC P0722 or P0723. |
• | No TCC stuck ON DTC P0742. |
• | No TCC release switch DTC P0842 or P0843. |
• | The engine speed is greater than 500 RPM for 5 seconds. |
• | The engine torque is 50 N·m (37 lb ft) or greater. |
• | The transmission fluid temperature is 20-130°C (68-266°F). |
• | The calc. throttle position is between 8-90 percent. |
• | The TCC PWM solenoid valve is commanded ON. |
• | The TCC duty cycle is greater than 65 percent for 5 seconds. |
• | The commanded gear is 2nd, 3rd or 4th. |
The TCC slip speed is greater than 175 RPM or greater for 5 seconds 6 times during the same ignition cycle.
• | The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met. |
• | The TCM forces the TCC OFF. |
• | The TCM inhibits TCC engagement. |
• | The TCM inhibits 4th gear if the transmission is in Hot Mode. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Freeze Frame and Failure Records. |
• | The TCM stores DTC P0741 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met. |
• | The ECM turns OFF the MIL after the third consecutive trip in which the TCM does not send an MIL illumination request. |
• | A scan tool can clear the MIL/DTC. |
• | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring. |
• | The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM. |
• | Prior to replacing the torque converter refer to the Torque Converter Replacement Guide . |
• | Residue or contamination may cause valves to stick intermittently. |
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||||||||||||||||||||||
2 | Did you perform the Transmission Fluid Checking Procedure? | -- | Go to Step 3 | Go to Transmission Fluid Check | ||||||||||||||||||||||||||||||||
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear Info function will erase the stored Freeze Frame and Failure Records from the TCM. Does the scan tool indicate the TCC Slip Speed is within the specified value? | -50 RPM to +180 RPM | Go to Diagnostic Aids | Go to Step 4 | |||||||||||||||||||||||||||||||||
4 |
Did you complete the repair? | -- | Go to Step 5 | -- | ||||||||||||||||||||||||||||||||
5 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 6 | Go to Step 2 | ||||||||||||||||||||||||||||||||
6 | With a scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |