Circuit Description
The Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) is a pulse width modulated solenoid. The Powertrain Control Module (PCM) energizes the TCC Sol. Valve by grounding circuit 418. When vehicle operating conditions are appropriate for TCC application, the PCM begins the TCC duty cycle at approximately 68%. The PCM then increases the duty cycle up to 93%, in order to achieve full TCC-apply pressure.
When the TCC Sol. Valve is de-energized, the solenoid blocks filtered 2-3 drive fluid, and allows TCC signal fluid to exhaust. When energized, the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized, modulation stops, and the solenoid blocks both 2-3 drive fluid and TCC signal fluid exhaust.
When the PCM detects a high TCC slip speed when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.
Conditions for Setting the DTC
| • | No TP Sensor DTCs P0121, P0122 or P0123. |
| • | No A/T OSS DTCs P0502 or P0503. |
| • | No TCC Stuck ON DTC P0742. |
| • | No TFP Val. Position Sw. DTC P1810. |
| • | No TCC release DTC P1887. |
| • | Time since the last manual gear select lever change is greater than 3 seconds. |
| • | The TFP Val. Position Sw. indicates 2, 3, or D. |
| • | The PCM commands the TCC ON for greater than 3 seconds. |
| • | The TP is 10-75%. |
| • | The transmission fluid temperature (TFT) is 20-130°C (94-292°F). |
| • | The commanded gear is 2nd, 3rd, or D. |
| • | The TCC slip speed is 300 RPM, or greater, for 5 seconds, two consecutive times. |
Action Taken When the DTC Sets
| • | The PCM does illuminates the Malfunction Indicator Lamp (MIL). |
| • | The PCM inhibits TCC engagement. |
| • | The PCM freezes shift adapts from being updated. |
| • | DTC P0741 is stored in the PCM history. |
Conditions for Clearing the MIL/DTC
| • | The PCM turns OFF the MIL after three consecutive trips without a failure reported. |
| • | A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported. |
| • | The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM. |
Diagnostic Aids
| • | Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector and all other circuit connecting points. Look for the following conditions: |
| - | A bent terminal |
| - | A backed out terminal |
| - | A damaged terminal |
| - | Poor terminal tension |
| - | A chafed wire |
| - | A broken wire inside the insulation |
| - | Moisture intrusion |
| - | Corrosion |
| • | When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
DTCs P0719, P0753, and P0758 also set if the power circuit is open.
-
This step verifies the PCM's ability to command the TCC Sol. Valve.
-
This step tests for correct component, and circuit, resistance.
Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||||||||||
Important: Before clearing the DTC(s), 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 PCM. Are DTCs P0719, P0753 and P0758 also set? | -- | |||||||||||
3 |
Refer to Troubleshooting Procedures in the Electrical Diagnosis Section. Did you find the condition? | -- | ||||||||||
4 | Repair the short to ground in circuit 439. Refer to Troubleshooting Procedures in the Electrical Diagnosis Section. Did you find and correct the condition? | -- | ||||||||||
5 |
Is the test lamp ON? | -- | ||||||||||
6 | Inspect circuit 439 between terminal E and the splice for an open. Refer to Troubleshooting Procedures in the Electrical Diagnosis Section. Did you find and correct the condition? | -- | -- | |||||||||
Is the test lamp ON when the duty cycle is 100%, and OFF when the duty cycle is 0%? | -- | |||||||||||
8 | Inspect circuit 418 for an open. Refer to Troubleshooting Procedures in the Electrical Diagnosis Section. Did you find and correct the condition? | -- | ||||||||||
Is the resistance within the specified range? | 10-15 ohms | |||||||||||
10 |
Refer to Troubleshooting Procedures in the Electrical Diagnosis Section. Did you find the condition? | -- | ||||||||||
11 | Replace the Automatic Transmission Wiring Harness. Refer to Automatic Transmission Wiring Harness Replacement in On-Vehicle Service Is the replacement complete? | -- | -- | |||||||||
12 | Replace the TCC Sol. Valve. Refer to Torque Converter Clutch Solenoid Valve Replacement, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||||
13 | Replace the PCM. Refer to Powertrain Control Module/EEPROM Replacement/Programming . Is the replacement complete? | -- | -- | |||||||||
14 |
Refer to Unit Repair. Is the repair complete? | -- | -- | |||||||||
15 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
