Code No.P1773 (P0753) Low-reverse solenoid valve system
![](../../../img/23/AC609176AB00ENG.png)
![](../../../img/23/AC609230AB00ENG.png)
![](../../../img/23/AC607558AB00ENG.png)
![](../../../img/23/AC607560AE00ENG.png)
![](../../../img/23/AC607563BU00ENG.png)
![](../../../img/23/AC607569BV00ENG.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
- Solenoid valve closes or opens according to the signals from the
ECU.
- The ECU energises or deenergises solenoid valve, based on input signals
such as accelerator pedal position sensor opening angle, inhibitor switch,
etc.
DIAGNOSIS CODE SET CONDITIONS
If the drive terminal voltage of the
low-reverse solenoid valve is 3.0 V or less, it is judged that there is a
short circuit or open circuit in the low-reverse solenoid valve, and diagnosis
code No.P1773 (P0753) is set.
If diagnosis code No.P1773 (P0753) is set,
the transmission is fixed in 3rd as a fail-safe measure.
PROBABLE CAUSES
- Malfunction of low-reverse 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 P1777 (P0773) <5A/T> and P1778 (P0743)
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 1: Low-reverse 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.6 and No.10 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 low-reverse solenoid valve and solenoid valve harness.
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STEP 5. Measure the voltage at A/T-ECU connector D-38 <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-38
terminal No.62 <4M4> and earth or engine-A/T-ECU connector D-218
terminal No.128 <6G7> and earth. OK: System
voltage
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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-38 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.6 and A/T-ECU connector D-38 terminal
No.62 <4M4> or engine-A/T-ECU connector D-218 terminal No.128
<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 1: Low-reverse 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.6 and No.10 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.6 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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