Lexus ES: Torque Converter Clutch Circuit Short to Battery or Open (P074015)
DESCRIPTION
Refer to DTC P074011.
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P074015 | Torque Converter Clutch Circuit Short to Battery or Open | While the vehicle is being driven so that lock-up is requested, a short to +B or open is detected in the solenoid (SL) valve circuit (2-trip detection logic). |
| Comes on | DTC stored | SAE Code: P2770 |
MONITOR DESCRIPTION
Based on the signals from the throttle position sensor, the air flow meter and the crankshaft position sensor, the ECM sends a signal to solenoid (SL) valve to regulate the hydraulic pressure and provide smoother torque converter engagement. Solenoid (SL) valve responds to commands from the ECM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the ECM detects an open or short to +B in the solenoid (SL) valve circuit, it will illuminate the MIL and store the DTC.
MONITOR STRATEGY
| Related DTCs | P2770: Solenoid (SL) valve/Range check |
| Required sensors/components | Solenoid (SL) valve |
| Frequency of operation | Continuous |
| Duration | 1 time |
| MIL operation | 2 driving cycles |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever the following DTCs are not stored | None |
| Battery voltage | 8 V or more |
| Engine switch | On (IG) |
| Starter | OFF |
TYPICAL MALFUNCTION THRESHOLDS
| All of the following conditions are met | 0.065536 sec. or more |
| Time after command to solenoid ON to OFF | 0.008192 sec. or more |
| Command to solenoid | OFF |
| Solenoid terminal voltage level | High |
COMPONENT OPERATING RANGE
| Solenoid (SL) valve | Resistance: 11 to 15 Ω at 20°C (68°F) |
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
-
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
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- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for 2 minutes or more.
- Turn the engine switch on (IG) and turn the Techstream on.
- Start the engine.
-
Perform the Lock-up Function inspection in Road Test. [*1]
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HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Stop the vehicle.
- Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
- Input the DTC: P074015.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.
WIRING DIAGRAM
Refer to DTC P074011.
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CAUTION / NOTICE / HINT
NOTICE:
-
Perform the universal trip to clear permanent DTCs.
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-
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
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PROCEDURE
| 1. | INSPECT TRANSMISSION WIRE (SOLENOID (SL) VALVE) |
| (a) Disconnect the C30 transmission wire connector. |
|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 13 (S1) - Body ground | 20°C (68°F) | 11 to 15 Ω |
| 13 (S1) - Other terminals | Always | 10 kΩ or higher |
(c) Connect the C30 transmission wire connector.
| NG | .gif) | GO TO STEP 4 |
|
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| 2. | CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
(a) Disconnect the C78 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C78-19 (SL) - Body ground | 20°C (68°F) | 11 to 15 Ω |
| C78-19 (SL) - Other terminals | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) |
|
| 3. | REPLACE ECM |
(a) Replace the ECM.
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| NEXT | | PERFORM REGISTRATION |
| 4. | INSPECT SOLENOID (SL) VALVE |
| (a) Remove the solenoid (SL) valve. Click here |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Solenoid (SL) valve connector terminal - Solenoid (SL) valve body | 20°C (68°F) | 11 to 15 Ω |
(c) Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
| OK | | REPAIR OR REPLACE TRANSMISSION WIRE |
| NG | | REPLACE SOLENOID (SL) VALVE |
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