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) |
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P0974 | ECM detects open in solenoid valve S1 circuit 2 times when solenoid valve S1 is not operated (1-trip detection logic) |
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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
The monitor will run whenever the following DTCs are not present | None |
Battery voltage | 8 V or more |
Ignition switch | ON |
Starter | OFF |
Shift solenoid valve S1 | ON |
Shift solenoid valve S1 | OFF |
TYPICAL MALFUNCTION THRESHOLDS
Shift solenoid valve S1 resistance | 8 Ω or less |
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
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) |
Disconnect the D63 transmission wire connector.
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
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OK | |
2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Disconnect the D74 ECM connector.
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
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OK | ||
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3.INSPECT SHIFT SOLENOID VALVE S1 |
Remove shift solenoid valve S1.
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
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.
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OK | ||
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