| DTC Code | DTC Name |
|---|---|
| P079513 | Pressure Control Solenoid "C" Circuit Open |
DTC SUMMARY
Click here
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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:
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Open or short between solenoid (SL3) valve and hybrid vehicle control ECU assembly
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Solenoid (SL3) valve malfunction
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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.
The following table shows normal operation of the solenoid (SL3) valve when the shift state is in drive (D).
| 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) |
|
Comes on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P079513 | Solenoid (SL3)* |
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*: SL3 solenoid forced operation request status. This item only changes when an Active Test is performed.
| DTC No. | Active Test |
|---|---|
| P079513 | Activate the Solenoid (SL3) |
CONFIRMATION DRIVING PATTERN
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.
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Connect the GTS to the DLC3.
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Turn the power switch on (IG) and turn the GTS on.
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Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
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Turn the power switch off and wait for 2 minutes or more.
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Turn the power switch on (READY).
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With the brake pedal depressed, move the shift lever to select shift state drive (D)
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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.
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Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
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Check the DTC judgment result.
Tip:
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If the judgment result shows NORMAL, the system is normal.
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If the judgment result shows ABNORMAL, the system has a malfunction.
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If the judgment result shows INCOMPLETE, perform driving pattern again.
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WIRING DIAGRAM
PROCEDURE
- Click here
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SOLENOID (SL3) VALVE) - HYBRID VEHICLE CONTROL ECU ASSEMBLY)
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*a Rear view of wire harness connector
(to Hybrid Vehicle Control ECU Assembly)
Disconnect the A77 hybrid vehicle control ECU assembly connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition A77-19 (SL3+) - A77-18 (SL3-) 20°C (68°F) 5.0 to 5.6 Ω A77-19 (SL3+) or A77-18 (SL3-) - Body ground Power switch off 10 kΩ or higher -
Reconnect the A77 hybrid vehicle control ECU assembly connector.
Result Proceed to OK NG
- OK
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLYClick here
- NGClick here
-
- Click here
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - HYBRID VEHICLE CONTROL ECU ASSEMBLY)
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Disconnect the D8 transmission wire connector.
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Disconnect the A77 hybrid vehicle control ECU assembly connector.
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*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 D8-6 (SL3+) - A77-19 (SL3+) Power switch off Below 1 Ω D8-13 (SL3-) - A77-18 (SL3-) Power switch off Below 1 Ω D8-6 (SL3+) or A77-19 (SL3+) - Body ground Power switch off 10 kΩ or higher D8-13 (SL3-) or A77-18 (SL3-) - Body ground Power switch off 10 kΩ or higher -
Reconnect the A77 hybrid vehicle control ECU assembly connector.
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Reconnect the D8 transmission wire connector.
Result Proceed to OK NG
- OKClick here
- NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - HYBRID VEHICLE CONTROL ECU ASSEMBLY)
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- Click here
INSPECT SOLENOID (SL3) VALVE
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*a Component without harness connected
(Solenoid (SL3) Valve)
Remove the solenoid (SL3) valve.
for 2WD:
for AWD:
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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 -
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. -
Install the solenoid (SL3) valve.
Result Proceed to OK NG
- OK
REPAIR OR REPLACE TRANSMISSION WIRE for 2WD:
REPAIR OR REPLACE TRANSMISSION WIREClick here
REPAIR OR REPLACE TRANSMISSION WIRE for AWD:
REPAIR OR REPLACE TRANSMISSION WIREClick here
- NG
REPLACE SOLENOID (SL3) VALVE for 2WD:
REPLACE SOLENOID (SL3) VALVEClick here
REPLACE SOLENOID (SL3) VALVE for AWD:
REPLACE SOLENOID (SL3) VALVEClick here
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