HYBRID CONTROL SYSTEM, Diagnostic DTC:P079513

DTC Code DTC Name
P079513 Pressure Control Solenoid "C" Circuit Open

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    The system performs shifting from 1st to 4th gear with ON-OFF combinations of solenoid valves (SL1), (SL2), (SL3) and (SL4). The current from the hybrid vehicle control ECU assembly is detected as not flowing to SL3 according to operation commands. The cause of this malfunction may be one of the following:


    • Open or short between solenoid (SL3) valve and hybrid vehicle control ECU assembly

    • Solenoid (SL3) valve malfunction

DESCRIPTION

Based on the ON-OFF combinations of the solenoid (SL1, SL2, SL3 and SL4) valves, the hybrid vehicle control ECU assembly performs gear shifts from 1st gear to 4th gear.

If a circuit related to a solenoid valve is open or shorted, the hybrid vehicle control ECU assembly uses the fail-safe function to turn other solenoid valves ON or OFF.

Tech Tips

The following table shows normal operation of the solenoid (SL3) valve when the shift lever is in D.

Shift Solenoid Valve Operation:
Gear 1st 2nd 3rd 4th
Solenoid (SL3) Valve OFF ON OFF ON
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P079513 Pressure Control Solenoid "C" Circuit Open

The current does not flow appropriately, even when operation commands are sent from the hybrid vehicle control ECU assembly to the solenoid (SL3) valve.

(1-trip detection logic)

  • Solenoid (SL3) valve

  • Transmission wire

  • Harness and connector

  • Hybrid vehicle control ECU assembly

 Comes on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P079513 Solenoid (SL3)*

Related Active Test
DTC No. Active Test
P079513

  • Activate the Solenoid (SL3)

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for 2 minutes or more.

  5. Turn the power switch on (READY).

  6. With the brake pedal depressed, move the shift lever to select shift position D

  7. Drive the vehicle for 3 seconds or more with the value of the "Current Calculated Gear Position" Data List item set to "2rd" or "4th".

    CAUTION:

    Strictly observe posted speed limits, traffic laws and road conditions when performing this test.

    Tech Tips

    If the Data List updates slowly, perform measurement after selecting only the "Current Calculated Gear Position", "Output Shaft Revolution (Transmission)", "Motor Revolution", "Vehicle Speed" and "Accelerator Position" items.

  8. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  9. Check the DTC judgment result.

    Tech Tips


    • 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

B000PPDE71
*a Solenoid (SL3) Valve
*b Transmission Wire
*c Hybrid Vehicle Control ECU Assembly

PROCEDURE


  1. CHECK HARNESS AND TRANSMISSION WIRE (TRANSMISSION WIRE (SOLENOID (SL3) VALVE) - HYBRID VEHICLE CONTROL ECU ASSEMBLY)


    1. B004BBAC30
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

      Disconnect the A22 hybrid vehicle control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A22-19 (SL3+) - A22-18 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω
      A22-19 (SL3+) or A22-18 (SL3-) - Body ground Power switch off 10 kΩ or higher

    3. Reconnect the A22 hybrid vehicle control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - HYBRID VEHICLE CONTROL ECU ASSEMBLY)


    1. Disconnect the G32 transmission wire connector.

    2. Disconnect the A22 hybrid vehicle control ECU assembly connector.

    3. B000SP9C12
      *a

      Front view of wire harness connector

      (to Transmission Wire)
      *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G32-6 (SL3+) - A22-19 (SL3+) Power switch off Below 1 Ω
      G32-13 (SL3-) - A22-18 (SL3-) Power switch off Below 1 Ω
      G32-6 (SL3+) or A22-19 (SL3+) - Body ground Power switch off 10 kΩ or higher
      G32-13 (SL3-) or A22-18 (SL3-) - Body ground Power switch off 10 kΩ or higher

    4. Reconnect the A22 hybrid vehicle control ECU assembly connector.

    5. Reconnect the G32 transmission wire connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - HYBRID VEHICLE CONTROL ECU ASSEMBLY)

    OK

  3. INSPECT SOLENOID (SL3) VALVE


    1. B000T21C01
      *a

      Component without harness connected

      (Solenoid (SL3) Valve)

      Remove the solenoid (SL3) valve.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of the solenoid (SL3) valve - terminal 2 20°C (68°F) 5.0 to 5.6 Ω

    3. Connect a positive (+) lead from the battery with a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector. Check that the valve moves and makes an operating sound.

      OK
      Valve moves and makes an operating sound.

    4. Install the solenoid (SL3) valve.

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE TRANSMISSION WIRE Click here

    NG

    REPLACE SOLENOID (SL3) VALVE Click here