Code No.P1774 (P0758) Underdrive solenoid valve system
SOLENOID VALVE SYSTEM CIRCUIT
Refer to
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![](../../../img/23/AC607558AB00ENG.png)
![](../../../img/23/AC607560AE00ENG.png)
![](../../../img/23/AC607563BW00ENG.png)
![](../../../img/23/AC607569BX00ENG.png)
![](../../../img/23/AC607564BX00ENG.png)
![](../../../img/23/AC607571BY00ENG.png)
![](../../../img/23/AC607563BV00ENG.png)
![](../../../img/23/AC607569BW00ENG.png)
![](../../../img/23/AC607563AU00ENG.png)
![](../../../img/23/AC607569AW00ENG.png)
OPERATION
Refer to
.
DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the
underdrive solenoid valve is 3.0 V or less, it is judged that there is a
short-circuit or open circuit in the solenoid valve, and diagnosis code
No.P1774 (P0758) is set.
If diagnosis code No.P1774 (P0758) is set, the
transmission is fixed in 3rd as a fail-safe measure.
PROBABLE CAUSES
- Malfunction of underdrive solenoid valve
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU <4M4>
- Malfunction of the engine-A/T-ECU <6G7>
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STEP 1. M.U.T.-III diagnosis code
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Q.
Are diagnosis codes P1775 (P0763) and P1776 (P0768) set?
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Go to Step 9.
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Go to Step 2.
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STEP 2. M.U.T.-III actuator test
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Item 2: Underdrive solenoid valve
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OK: Operating sound can be
heard.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to
GROUP 00 - How to Cope with Intermittent Malfunction ).
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Go to Step 3.
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STEP 3. Connector check: C-06 A/T control solenoid valve assembly
connector
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair
the defective connector.
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STEP 4. Measure the resistance at A/T control solenoid valve
assembly connector C-06.
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Disconnect the connector, and measure the
resistance between terminal No.3 and No.9 at the solenoid valve
side.
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OK: 2.7 - 3.4 Ω
(A/T fluid temperature 20°C)
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Q.
Is the check result normal?
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Go to Step 5.
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Check
the underdrive solenoid valve.
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STEP 5. Measure the voltage at A/T-ECU connector D-37 <4M4>
or engine-A/T-ECU connector D-218 <6G7>.
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(1)Connect A/T control solenoid valve assembly
connector C-06.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the voltage between A/T-ECU connector D-37
terminal No.1 <4M4> and earth or engine-A/T-ECU connector D-218
terminal No.137 <6G7> and earth. OK: 6 - 9
V
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 6.
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STEP 6. Connector check: D-225 intermediate connector, D-37 A/T-ECU
connector <4M4> or D-218 engine-A/T-ECU connector
<6G7>
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 7.
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Repair
the defective connector.
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STEP 7. Check the harness between A/T control solenoid valve
assembly connector C-06 terminal No.3 and A/T-ECU connector D-37 terminal
No.1 <4M4> or engine-A/T-ECU connector D-218 terminal No.137
<6G7>.
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Check the output line for short or open
circuit.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the wiring harness.
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STEP 8. M.U.T.-III actuator test
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Item 2: Underdrive solenoid valve
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OK: Operating sound can be
heard.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to
GROUP 00 - How to Cope with Intermittent Malfunction ).
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Replace the A/T-ECU <4M4>
or engine-A/T-ECU <6G7>.
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STEP 9. Connector check: C-06 A/T control solenoid valve assembly
connector
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair
the defective connector.
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STEP 10. Measure the resistance at A/T control solenoid valve
assembly connector C-06.
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Disconnect the connector, and measure the
resistance between terminal No.3 and No.9 at the solenoid valve
side.
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OK: 2.7 - 3.4 Ω
(A/T fluid temperature 20°C)
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Q.
Is the check result normal?
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Go to Step 11.
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Check
the solenoid valve harness.
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STEP 11. Connector check: D-110 A/T control relay connector,
D-224 intermediate connector, D-113 J/C (6)
<4M4>
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Check for the contact with terminals.
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Q.
Is the check result normal?
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Go to Step 12.
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Repair
the defective connector.
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STEP 12. Check the harness between A/T control solenoid valve
assembly connector C-06 terminal No.9 and A/T control relay
connector D-110 terminal No.3.
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Check the power supply line for short or open
circuit.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the wiring harness.
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