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Code No.31: Low-Reverse Solenoid Valve System |
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OPERATION
- Solenoid valve closes or opens according to the signals from the engine-A/T-ECU.
- The engine-A/T-ECU energizes or deenergizes solenoid valve, based on input signals such as throttle position sensor opening angle, inhibitor switch, etc.
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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 31 is set.
If diagnosis code 31 is output 4 times, the transmission is fixed in 3rd as a fail-safe measure.
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PROBABLE CAUSES
- Malfunction of low-reverse solenoid valve
- Damaged harness wires and connectors
- Malfunction of the engine-A/T-ECU
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STEP 1. MUT-II/III diagnosis code Q: Is diagnosis code 36 set?
YES:
Go to Step 9  .
NO:
Go to Step 2 .
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STEP 2. MUT-II/III actuator test
Item 01: Low-reverse solenoid valve
OK: Operating sound can be heard.
Q: Is the check result normal?
YES:
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction  ).
NO:
Go to Step 3 .
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STEP 3. Connector check: B-21 A/T control solenoid valve assembly connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Repair the defective connector.
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STEP 4. Measure the resistance at A/T control solenoid valve assembly connector B-21.
Disconnect the connector, and measure the resistance between terminal No.6 and No.10 at the solenoid valve side.
OK: 2.7 -
3.4 Ω
(A/T fluid temperature 20°C)
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Check the low-reverse solenoid valve and solenoid valve harness.
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STEP 5. Measure the voltage at engine-A/T-ECU connector C-109. - Connect A/T control solenoid valve assembly connector B-21.
- Turn the ignition switch to the ON position.
- Measure the voltage between engine-A/T-ECU connector C-109 terminal No.129 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Go to Step 6 .
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STEP 6. Connector check: C-109 engine-A/T-ECU connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair the defective connector.
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STEP 7. Check the harness between A/T control solenoid valve assembly connector B-21 terminal No.6 and engine-A/T-ECU connector C-109 terminal No.129.
Check the output line for short or open circuit.
Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Repair the wiring harness.
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STEP 8. MUT-II/III actuator test
Item 01: Low-reverse solenoid valve
OK: Operating sound can be heard.
Q: Is the check result normal?
YES:
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction ).
NO:
Replace the engine-A/T-ECU.
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STEP 9. Connector check: B-21 A/T control solenoid valve assembly connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 10 .
NO:
Repair the defective connector.
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STEP 10. Measure the resistance at A/T control solenoid valve assembly connector B-21.
Disconnect the connector, and measure the resistance between terminal No.6 and No.10 at the solenoid valve side.
OK: 2.7 -
3.4 Ω
(A/T fluid temperature 20°C)
Q: Is the check result normal?
YES:
Go to Step 11 .
NO:
Check the solenoid valve harness.
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TEP 11. Connector check: B-16X A/T control relay connector
Check for the contact with terminals.
Q: Is the check result normal?
YES:
Go to Step 12 .
NO:
Repair the defective connector.
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STEP 12. Check the harness between A/T control solenoid valve assembly connector B-21 terminal No.10 and A/T control relay connector B-16X terminal No.1.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Repair the wiring harness.
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