Batt/Fluid Temp (Fluid Temp Sens. Circuit & TCM Pwr. Source)

DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM POWER SOURCE)

Description








The A/T fluid temperature sensor detects the A/T fluid temperature and sends a signal to the TCM.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE





Remarks: Specification data are reference values.





ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE





After the repair, perform the following procedure to confirm the malfunction is eliminated.

With CONSULT-II
1. Start engine.
2. Select "DATA MONITOR" mode for"A/T" with CONSULT-II.
3. Drive vehicle under the following conditions: Selector lever in "D", vehicle speed higher than 20 km/h (12 MPH).

Without CONSULT-II
1. Start engine.





2. Drive vehicle under the following conditions:
Selector lever in "D", vehicle speed higher than 20 km/h (12 MPH)





3. Perform self-diagnosis.
Refer to TCM Self-diagnostic Procedure (No Tools), "TCM Self-diagnostic Procedure (No Tools)"








Wiring Diagram-AT-BA/FTS

Diagnostic Procedure
1. CHECK TCM POWER SOURCE
1. Turn ignition switch to "ON" position. (Do not start engine.)
2. Check voltage between TCM terminals 10, 19, 28 and ground.
Voltage : Battery voltage
3. Turn ignition switch to "OFF" position.





4. Check voltage between TCM terminal 28 and ground.
Voltage : Battery voltage
OK or NG
OK >> GO TO 2.
NG >> Check the following items:
^ Harness for short or open between ignition switch and TCM (Main harness)
^ Harness for short or open between battery and TCM (Main harness)
^ Ignition switch and fuse
Refer to "POWER SUPPLY ROUTING".

2. CHECK A/T FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY
1. Turn ignition switch to "OFF" position.
2. Disconnect terminal cord assembly connector F50 in engine compartment.





3. Check resistance between terminal cord assembly F50 terminals 6 and 7 when A/T is cold.
4. Reinstall any part removed.
OK or NG
OK (With CONSULT-II)>> GO TO 3.
OK (Without CONSULT-II) >> GO TO 4.
NG >>
1. Remove oil pan.
2. Check the following items:
- A/T fluid temperature sensor
Refer to "Component Inspection".
- Harness of terminal cord assembly for short or open

3. CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for"A/T" with CONSULT-II.





3. Read out the value of "FLUID TEMP SE".
Voltage
Cold [20°C (68°F)]: Approximately 1.5V
Hot [80°C (176°F)] 0.5V
OK or NG
OK >>GO TO 5.
NG >>Check the following items:
^ Harness for short or open between TCM, ECM and terminal cord assembly (Main harness)
^ Ground circuit for ECM
Refer to "Wiring Diagram".

4. CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.





2. Check voltage between TCM terminal 47 and ground while warming up A/T.
Voltage
Cold [20°C (68°F)]: Approximately 1.5V
Hot [80°C (176°F)] 0.5V
3. Turn ignition switch to "OFF" position.
4. Disconnect TCM harness connector.





5. Check resistance between terminal 42 (B/W) and ground.
Continuity should exist.
OK or NG
OK >> GO TO 5.
NG >> Check the following items:
^ Harness for short or open between TCM, ECM and terminal cord assembly (Main harness)
^ Ground circuit for ECM
Refer to "Wiring Diagram".

5. CHECK DTC
Perform "DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE".
OK or NG
OK >> INSPECTION END
NG >>
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

Component Inspection
A/T FLUID TEMPERATURE SENSOR
^ Refer to "REMOVAL".








^ Check resistance between two terminals while changing temperature as shown.