DTC    P0973    Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1)

DTC    P0974    Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1)

for Preparation Click here


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 is 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. (In case of an open or short circuit, the ECM stops sending current to the circuit. For details, refer to the fail-safe chart (Click here).)

DTC Code
DTC Detection Condition
Trouble Area
P0973
ECM detects short in solenoid valve S1 circuit 2 times when solenoid valve S1 is operated (1-trip detection logic)
  1. Short in shift solenoid valve S1 circuit
  2. Shift solenoid valve S1
  3. ECM
P0974
ECM detects open in solenoid valve S1 circuit 2 times when solenoid valve S1 is not operated (1-trip detection logic)
  1. Open in shift solenoid valve S1 circuit
  2. Shift solenoid valve S1
  3. ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S1 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 S1 is on, if its resistance is 8 Ω or less, the ECM determines there is a short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is off, if its resistance is 100 kΩ or more, the ECM determines there is an open in the shift solenoid valve S1 circuit (Click here).

MONITOR STRATEGY


Related DTCs
P0973: Shift solenoid valve S1/Range check (Low resistance)
P0974: Shift solenoid valve S1/Range check (High resistance)
Required sensors/Components
Shift solenoid valve S1
Frequency of operation
Continuous
Duration
0.128 sec. 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

P0973: Range check (Low resistance) 
Shift solenoid valve S1
ON

P0974: Range check (High resistance) 
Shift solenoid valve S1
OFF

TYPICAL MALFUNCTION THRESHOLDS


P0973: Range check (Low resistance) 
Shift solenoid valve S1 resistance
8 Ω or less

P0974: Range check (High resistance) 
Shift solenoid valve S1 resistance
100 kΩ or more

COMPONENT OPERATING RANGE


Shift solenoid valve S1 resistance
11 to 15 Ω at 20°C (68°F)

WIRING DIAGRAM


C161204E01


INSPECTION PROCEDURE

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

HINT:
The shift solenoid valve S1 turns ON/OFF normally when the shift lever is in the D position.

ECM gear shift command
1st
2nd
3rd
4th
5th
Shift solenoid valve S1
ON
ON
OFF
OFF
OFF
1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S1)


    C159421E04
  1. Disconnect the D63 transmission wire connector.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    8 (S1) - Body ground
    20°C (68°F)
    11 to 15 Ω


NG
Go to step 3
OK


2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)


    C159422E09
  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
    D74-7 (S1) - Body ground
    20°C (68°F)
    11 to 15 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)  

3.INSPECT SHIFT SOLENOID VALVE S1


    C159062E01
  1. Remove shift solenoid valve S1.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    Shift solenoid S1 connector - Shift solenoid S1 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 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 S1 (Click here)
OK

REPAIR OR REPLACE TRANSMISSION WIRE (Click here)