Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Torque Converter Clutch Circuit Short to Battery or Open (P074015)

DESCRIPTION

Shift solenoid valve SL is turned on and off by signals from the ECM to control the hydraulic pressure acting on the lock-up relay valve, which then controls operation of the lock-up clutch.

DTC No.

DTC Detection Condition

Trouble Area

SAE

P074015

The shift solenoid valve SL terminal voltage level is high, when the shift solenoid valve SL is not operated (2 trip detection logic).

  • Open or short in shift solenoid valve SL circuit
  • Shift solenoid valve SL
  • ECM

P2770

Fail-safe function:

If the ECM detects a malfunction, it turns shift solenoid valve SL off.

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 shift solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter engagement. Shift solenoid valve SL 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 in the shift solenoid valve SL circuit, it will illuminate the MIL and store the DTC.

MONITOR STRATEGY

Related DTCs

P2770: Shift solenoid valve SL/Range check

Required sensors/Components

Shift solenoid valve SL

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 higher

Ignition switch

ON

Starter

OFF

Command to shift solenoid valve SL

OFF

Time after command to solenoid OFF to ON

More than 0.008192 sec.

TYPICAL MALFUNCTION THRESHOLDS

Solenoid terminal voltage level

High

COMPONENT OPERATING RANGE

Solenoid terminal voltage level

Low

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 (See page ).
  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine.
  7. Perform the Lock-up Function inspection in Road Test (See page HINT: ). [*1]

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Stop the vehicle.
  9. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  10. Input the DTC: P074015.
  11. 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 (See page CAUTION / NOTICE / HINT )

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs (See page Perform registration and/or initialization when parts related to the ).
  • Perform registration and/or initialization when parts related to the automatic transmission are replaced (See page ).

PROCEDURE

1.

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)

(a) Disconnect the E1 transmission wire connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (SL) - Body ground

20°C (68°F)

11 to 15 Ω

Text in Illustration

*a

Component without harness connected

(Transmission Wire)

NG

GO TO STEP 3

OK

2.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

E12-15 (SL) - Body ground

20°C (68°F)

11 to 15 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to ECM)

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

INSPECT SHIFT SOLENOID VALVE SL

(a) Remove shift solenoid valve SL (See page ).

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Shift solenoid valve SL connector terminal - Shift solenoid valve SL body

20°C (68°F)

11 to 15 Ω

(c) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

OK:

Measurement Condition

Specified Condition

  • Battery positive (+) → Shift solenoid valve SL connector
  • Battery negative (-) → Shift solenoid valve SL body

Valve moves and makes an operating noise

Text in Illustration

*1

Shift Solenoid Valve SL

OK

REPLACE TRANSMISSION WIRE

NG

REPLACE SHIFT SOLENOID VALVE SL

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Other materials:

System Description
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Precaution
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Installation
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