Code No.P0711: A/T fluid temperature sensor 1 system (Malfunction)
PROBABLE CAUSES
OPERATION
- The A/T fluid temperature sensor 1 converts the A/T fluid temperature to voltage, and send the information to the A/T-ECU.
- The A/T fluid temperature rises, the resistance decreases. Thus, the sensor output voltage depends on the A/T fluid temperature. As the A/T fluid temperature rises, the output voltage will decrease.
DIAGNOSIS CODE SET CONDITIONS
With driving at the vehicle speed of 40 km/h or more, if the fluid temperature (fluid temperature sensor 1) is not changed from the status with less than 20°C even after 10 minutes have elapsed (2 drive cycle), the code No.P0711 is set.
PROBABLE CAUSES
- Malfunction of the A/T fluid temperature sensor 1
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU
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STEP 1. M.U.T.-III data list
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Item 6: A/T fluid temperature sensor 1 (Refer to Data List Table  ).
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Q.
Is the check result normal?
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 Go to Step 5.
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 Go to Step 2.
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STEP 2. Measure the resistance at A/T control solenoid valve assembly connector.
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Disconnect the connector, and measure the resistance between terminal 14 and 7 at the sensor side.
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OK:
- Approx. 6.5 Ω (at 10°C)
- Approx. 3.5 Ω (at 25°C)
- Approx. 0.25 Ω (at 110°C)
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Q.
Is the check result normal?
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Go to Step 3.
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Replace the A/T fluid temperature sensor 1 and solenoid harness.
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STEP 3. Measure the resistance at A/T control solenoid valve assembly connector.
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Disconnect the connector, and measure the resistance between terminal GRSE line and earth at the wiring harness side.
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 4.
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STEP 4. Check for open circuit in GRSE line between A/T control solenoid valve assembly connector and A/T-ECU connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or wiring harness.
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STEP 5. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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Q.
Is diagnosis code No.P0711 set?
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Replace the A/T-ECU.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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STEP 6. Measure the voltage at A/T control solenoid valve assembly connector.
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(1)Disconnect the connector, and measure the voltage between terminal O/TS line and earth at the wiring harness side.
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(2)Turn the ignition switch to the ON position.
OK: 4.5 - 5.1 V
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 7.
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STEP 7. Measure the voltage at A/T-ECU connector.
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(1)Disconnect A/T control solenoid valve assembly connector.
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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 terminal O/TS and earth at the ECU side.
OK: 4.5 - 5.1 V
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 8.
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STEP 8. Check for short circuit in O/TS line between A/T control solenoid valve assembly connector and A/T-ECU connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or the wiring harness.
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STEP 9. Check for open circuit in O/TS line between A/T control solenoid valve assembly connector and A/T-ECU connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or the wiring harness.
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