DTC    P0979    Shift Solenoid "C" Control Circuit Low (Shift Solenoid Valve S3)

DTC    P0980    Shift Solenoid "C" Control Circuit High (Shift Solenoid Valve S3)

for Preparation Click here


DESCRIPTION

Shifting from 1st to 6th is performed in combination with ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely. Also, the ECM stops sending the current to the open or short circuited solenoid (Click here).

DTC Code
DTC Detection Condition
Trouble Area
P0979
ECM detects short in solenoid valve S3 circuit 2 times when solenoid valve S3 is operated (1 trip detection logic)
  1. Short in shift solenoid valve S3 circuit
  2. Shift solenoid valve S3
  3. ECM
P0980
ECM detects open in solenoid valve S3 circuit 2 times when solenoid valve S3 is not operated (1 trip detection logic)
  1. Open in shift solenoid valve S3 circuit
  2. Shift solenoid valve S3
  3. ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S3 circuit. 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. When the shift solenoid valve S3 is ON, if its resistance is 8 Ω or less, the ECM determines there is a short in the shift solenoid valve S3 circuit.
When the shift solenoid valve S3 is OFF, if its resistance is 100 kΩ or more, the ECM determines there is an open in the shift solenoid valve S3 circuit (Click here).

MONITOR STRATEGY


Related DTCs
P0979: Shift solenoid valve S3/Range check (Low resistance)
P0980: Shift solenoid valve S3/Range check (High resistance)
Required sensors/Components
Shift solenoid valve S3
Frequency of operation
Continuous
Duration
0.128 seconds or more
MIL operation
Immediately
Sequence of operation
None

TYPICAL ENABLING CONDITIONS


All 
The monitor will run whenever the following DTCs are not present
None
Battery voltage
8 V or more
Ignition switch
ON
Starter
OFF

P0979: Range Check (Low Resistance) 
Shift solenoid valve S3
ON

P0980: Range Check (High Resistance) 
Shift solenoid valve S3
OFF

TYPICAL MALFUNCTION THRESHOLDS


P0979: Range Check (Low Resistance) 
Shift solenoid valve S3 resistance
8 Ω or less

P0980: Range Check (High Resistance) 
Shift solenoid valve S3 resistance
100 kΩ or more

COMPONENT OPERATING RANGE


Shift solenoid valve S3 resistance
11 to 15 Ω at 20°C (68°F)

WIRING DIAGRAM


C161204E11


INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs (Click here).

HINT:
The shift solenoid valve S3 is turned ON/OFF normally when the shift lever is on D:

ECM gear shift command
1st
2nd
3rd
4th
5th
6th
Shift solenoid valve S3
ON
ON
ON
OFF
OFF
OFF
1.INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S3)


    C159421E11
  1. Disconnect the D63 No. 1 transmission wire connector.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    7 (S3) - Body ground
    20°C (68°F)
    11 to 15 Ω


NG
Go to step 3
OK


2.CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)
C159422E28
  1. Disconnect the D74 ECM connector.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    D74-3 (S3) - Body ground
    20°C (68°F)
    11 to 15 Ω
    Result 
    Result
    Proceed to
    NG
    A
    OK (for 3UR-FE)
    B
    OK (for 3UR-FBE)
    C


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR 

3.INSPECT SHIFT SOLENOID VALVE S3


    C160563E02
  1. Remove shift solenoid valve S3.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    Shift solenoid valve S3 connector terminal - Shift solenoid valve S3 body
    20°C (68°F)
    11 to 15 Ω
  1. Connect the battery's positive (+) lead to the terminal of the solenoid valve connector, and the negative (-) lead to the solenoid valve body. Then check that the valve moves and makes an operating noise.

    OK:
    Valve moves and makes an operating noise.


NG
REPLACE SHIFT SOLENOID VALVE S3 (Click here)
OK

REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (Click here)