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 BATT/FLUID TEMP SEN with CONSULT-II or 8th judgement flicker without CONSULT-II is detected when TCM receives an excessively low or high voltage from the sensor.

Possible Cause
Check the following items.
^ Harness or connectors
(The sensor circuit is open or shorted.)
^ A/T fluid temperature sensor

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 then 20 km/h (12 MPH).





3. Perform self-diagnosis.
Refer to "TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)".








Wiring Diagram-AT-BA/FTS

Diagnostic Procedure
1. 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)] -> Hot [80°C (176°F)]
:Approximately 1.5V -> 0.5V
OK or NG
OK >> GO TO 9.
NG >> GO TO 2.

2. DETECT MALFUNCTIONING ITEM
Check the following items:
^ Harness for short or open between TCM, ECM and terminal cord assembly (Main harness)
^ Harness for short or open between battery and TCM (Main harness)
^ Ground circuit for ECM
Refer to "POWER SUPPLY CIRCUIT FOR ECM".
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.

3. CHECK TCM POWER SOURCE STEP 1
1. Turn ignition switch to ON position. (Do not start engine.)





2. Check voltage between TCM terminals 10, 19, 28 and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 5.

4. CHECK TCM POWER SOURCE STEP 2
1. Turn ignition switch to OFF position.





2. Check voltage between TCM terminal 28 and ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.

5. DETECT MALFUNCTIONING ITEM
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".
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

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





3. Check resistance between terminal cord assembly F30 terminals 6 and 7 (component side) when A/T is cold.
4. Reinstall any part removed.
OK or NG
OK (without CONSULT-II) >> GO TO 8.
NG >> GO TO 7.

7. DETECT MALFUNCTIONING ITEM
1. Remove oil pan.








2. Check the following items:
- A/T fluid temperature sensor
- Check resistance between two terminals while changing temperature as shown.
- Harness of terminal cord assembly for short or open
OK or NG
OK (without CONSULT-II) >> GO TO 8.
NG >> Repair or replace damaged parts.

8. 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)] -> Hot [80°C (176°F)]
:Approximately 1.5V -> 0.5V
3. Turn ignition switch to OFF position.
4. Disconnect TCM harness connector.
5. Check resistance between TCM harness connector terminal 42 and ground. Refer to "Wiring Diagram-AT-BA/FTS"
Continuity should exist.
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.

9. DETECT MALFUNCTIONING ITEM
Check the following items:
^ Harness for short or open between TCM, ECM and terminal cord assembly (Main harness)
^ Ground circuit for ECM Refer to "POWER SUPPLY ROUTING".
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.

10. CHECK DTC
Perform "Diagnostic Trouble Code (DTC) Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 11.

11. CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.