Code No.P1763 (P0710) A/T
fluid temperature sensor system
OPERATION
The A/T fluid temperature sensor 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
If the A/T fluid temperature sensor output voltage is 4.5 volts or more after
driving for 10 minutes or more, there is an open circuit in the A/T fluid temperature
sensor and diagnosis code No.P1763 (P0710) is set.
PROBABLE CAUSES
Malfunction of the A/T fluid temperature sensor
Damaged harness wires and connectors
Malfunction of the A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 07: A/T fluid temperature sensor (Refer to Data List Table ).
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction ).
Go to Step 2.
STEP 2. Measure the resistance at A/T control solenoid valve
assembly connector B-15.
Disconnect the connector, and measure the resistance between terminal 1 and 2 at the sensor
side. OK:
16.7 -
20.5 kΩ
(at 0°C)
7.3 -
8.9 kΩ
(at 20°C)
3.4 -
4.2 kΩ
(at 40°C)
1.9 -
2.2 kΩ
(at 60°C)
1.0 -
1.2 kΩ
(at 80°C)
0.57 -
0.69 kΩ
(at 100°C)
Q.
Is the check result normal?
Go to Step 3.
Replace the A/T fluid temperature sensor.
STEP 3. Connector check: B-15 A/T control solenoid valve
assembly
Check for the contact with terminals.
Q.
Is the check result normal?
Go to Step 4.
Repair the defective connector.
STEP 4. Measure the resistance at A/T control solenoid valve
assembly connector B-15.
Disconnect the connector, and measure the resistance between terminal 2 and earth at the
wiring harness side. OK: Continuity (Less than 2 Ω)
Q.
Is the check result normal?
Go to Step 9.
Go to Step 5.
STEP 5. Measure the voltage at A/T-ECU connector C-12.
(1)Connect A/T control solenoid valve assembly connector B-15.
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between A/T-ECU connector C-12 terminal No.43 and earth. OK: 0.5 V or less
Q.
Is the check result normal?
Go to Step 8.
Go to Step 6.
STEP 6. Connector check: C-12 A/T-ECU connector
Check for the contact with terminals.
Q.
Is the check result normal?
Go to Step 7.
Repair the defective connector.
STEP 7. M.U.T.-III data list
Item 07: A/T fluid temperature sensor (Refer to Data List Table .)
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction ).
STEP 9. Measure the voltage at A/T control solenoid valve
assembly connector B-15.
(1)Disconnect the connector, and measure the voltage between terminal 1 and earth at the
wiring harness side. (2)Turn the ignition switch to the ON position. OK: 4.5 -
4.9 V
Q.
Is the check result normal?
Go to Step 7.
Go to Step 10.
STEP 10. Measure the voltage at A/T-ECU connector C-12.
(1)Connect A/T control solenoid valve assembly connector B-15.
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between A/T-ECU connector C-12 terminal No.44 and earth. OK: