AUTOMATIC TRANSMISSION SYSTEM (for 1GR-FE), Diagnostic DTC:P0778

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, S1, S2 and SR which are controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly (Click here).

MONITOR DESCRIPTION

This DTC indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. The ECM performs the fail-safe function and turns the other normal shift solenoid valves "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit).

While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction (Click here).

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)

   
   
   1. 

      Disconnect the transmission wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 11 (SL2+) - 3 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω 11 (SL2+) - Body ground Always 10 kΩ or higher 3 (SL2-) - Body ground Always 10 kΩ or higher

      Table 1. Text in Illustration

      *a	Component without harness connected (Transmission Wire)

   
   
   • OKClick here
   • NGClick here
2. Click here

   CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

   
   
   1. 

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition C45-12 (SL2+) - C45-13 (SL2-) 20°C (68°F) 5.0 to 5.6 Ω C45-12 (SL2+) - Body ground Always 10 kΩ or higher C45-13 (SL2-) - Body ground Always 10 kΩ or higher

      Table 2. Text in Illustration

      *a	Front view of wire harness connector (to ECM)

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT SHIFT SOLENOID VALVE SL2

   
   
   1. 

      Remove the shift solenoid valve SL2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 5.0 to 5.6 Ω

   3. 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 (+) with a 21 W bulb → Terminal 1 Battery negative (-) → Terminal 2 Valve moves and makes an operating noise

      Table 3. Text in Illustration

      *a	Component without harness connected (Shift Solenoid Valve SL2)

   
   
   • OKClick here
   • NGClick here
4. Click here

   REPAIR OR REPLACE TRANSMISSION WIREClick here

5. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

6. Click here

   REPLACE ECMClick here

7. Click here

   REPLACE SHIFT SOLENOID VALVE SL2Click here