DTC P0973/62 Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1) |
DTC P0974/62 Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1) |
DTC P0976/63 Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2) |
DTC P0977/63 Shift Solenoid "B" Control Circuit High (Shift Solenoid Valve S2) |
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DESCRIPTION
Shifting from 1st to 4th is performed in combination with the ON and OFF operation of the shift solenoid valves S1 and S2 controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated safely (fail-safe function).Fail-safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid valve SL OFF at the same time. If both solenoids are malfunctioning, electronic hydraulic control does not operate and must be performed manually. Manual shifting as shown in the following table must be performed.
In case of a short circuit, the ECM stops sending current to the circuit.
Position | Normal | Shift Solenoid S1 Malfunctioning | Shift Solenoid S2 Malfunctioning | Both Solenoids Malfunctioning | ||||||
Solenoid valve | Gear | Solenoid valve | Gear | Solenoid valve | Gear | Gear when shift selector is manually operated | ||||
S1 | S2 | S1 | S2 | S1 | S2 | |||||
D | ON | OFF | 1st | X | ON | 3rd | ON | X | 1st | 4th |
ON | ON | 2nd | X | ON | 3rd | OFF | X | 4th | 4th | |
OFF | ON | 3rd | X | ON | 3rd | OFF | X | 4th | 4th | |
OFF | OFF | 4th | X | OFF | 4th | OFF | X | 4th | 4th | |
2 | ON | OFF | 1st | X | ON | 3rd | ON | X | 1st | 3rd |
ON | ON | 2nd | X | ON | 3rd | OFF | X | 3rd | 3rd | |
OFF | ON | 3rd | X | ON | 3rd | OFF | X | 3rd | 3rd | |
L | ON | OFF | 1st | X | OFF | 1st | ON | X | 1st | 1st |
ON | ON | 2nd | X | ON | 2nd | ON | X | 1st | 1st |
- HINT:
- X: Malfunction
DTC No. | DTC Detection Condition | Trouble Area |
P0973/62 | ECM detects short in solenoid valve S1 circuit 4 times when solenoid valve S1 is operated (1 trip detection logic) |
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P0974/62 | ECM detects open in solenoid valve S1 circuit 4 times when solenoid valve S1 is not operated (1 trip detection logic) |
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P0976/63 | ECM detects short in solenoid valve S2 circuit 4 times when solenoid valve S2 is operated (1 trip detection logic) |
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P0977/63 | ECM detects open in solenoid valve S2 circuit 4 times when solenoid valve S2 is not operated (1 trip detection logic) |
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MONITOR DESCRIPTION
The ECM controls gear shift 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 a DTC.The ECM performs the fail-safe function and turns the normally functioning shift solenoid valve ON/OFF.
In case of an open or short circuit, the ECM stops sending current to the circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
1.INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S1/S2) |
Disconnect the E1 wire connector.
Measure the resistance of the transmission wire.
- Standard resistance:
Tester Connection Condition Specified Condition 4 (S1) - Body ground 20°C (68°F) 11 to 15 Ω 8 (S2) - Body ground 20°C (68°F) 11 to 15 Ω
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OK | |
2.CHECK WIRE HARNESS (SHIFT SOLENOID VALVE S1/S2 - ECM) |
Disconnect the E11 ECM connector.
Measure the resistance of the wire harness side connector.
- Standard resistance:
Tester Connection Condition Specified Condition E11-9 (S1) - Body ground 20°C (68°F) 11 to 15 Ω E11-8 (S2) - 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/S2 |
Remove the shift solenoid valve S1/S2.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition Shift solenoid valve S1 connector terminal - Shift solenoid valve S1 body 20°C (68°F) 11 to 15 Ω Shift solenoid valve S2 connector terminal - Shift solenoid valve S2 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 valve 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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