DTC Batt/Fluid Temp SEN (A/T Fluid Temp Sensor Circuit and TCM Power 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-III Reference Value in Data Monitor Mode:

On Board Diagnosis Logic
^ This is not an OBD-II self-diagnostic item.
^ Diagnostic trouble code "BATT/FLUID TEMP SEN" with CONSULT-III or 8th judgement flicker without CONSULT-III is detected when TCM receives an excessively low or high voltage from the sensor.

Possible Cause
^ Harness or connector
(The sensor circuit is open or shorted.)
^ A/T fluid temperature sensor

DTC Confirmation Procedure

CAUTION:
^ Always drive vehicle at a safe speed.
^ If performing this "DTC Confirmation Procedure" again, always turn ignition switch OFF and wait at least 10 seconds before continuing.

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

WITH CONSULT-III
1. Start engine.
2. Select "DATA MONITOR" mode for "A/T" with CONSULT-III.
3. Touch "START".
4. Drive vehicle under the following conditions.
SLCT LVR POSI: "D" position
VEHICLE SPEED: Higher than 20 km/h (12 MPH)
5. If the check result is NG, go to "Diagnosis Procedure".

WITHOUT CONSULT-III
1. Start engine.
2. Drive vehicle under the following conditions.
Selector lever position: D position
Vehicle speed: higher than 20 km/h (12 MPH)
3. Perform self-diagnosis. Refer to AT-78, "Diagnosis Procedure without CONSULT-III". Diagnosis Procedure Without Consult-III
4. If the check result is NG, go to "Diagnosis Procedure".

Wiring Diagram - AT - BA/FTS

AT-BA/FTS-01:

TCM TERMINALS AND REFERENCE VALUES
Refer to AT-71, "TCM Terminal and Reference Value". RE4F03B 4 Speed Automatic Transmission

Diagnosis Procedure

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








2. Check voltage between TCM connector terminals and ground.
3. Turn ignition switch OFF.








4. Check voltage between TCM connector terminals and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.

2. DETECT MALFUNCTIONING ITEM
Check the following items:
^ Harness for short or open between ignition switch and TCM terminals 10, 19
^ Harness for short or open between battery and TCM terminal 28
^ 10A fuse (No.1 3, located in the fuse block) and 10A fuse (No.49, located in the IPDM E/R)
^ Ignition switch.
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.

3. CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR

With CONSULT-III
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-III.
3. Readout the value of "FLUID TEMP SE".





Without CONSULT-III
1. Start engine.








2. Check voltage TCM connector terminals while warming up A/T.
OK or NG
OK >> GO TO 9.
NG >> GO TO 4.

4. DETECT MALFUNCTIONING ITEM
Check the following items:
^ Harness for short or open between TCM, ECM and terminal cord assembly
^ Ground circuit for ECM
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.

5. CHECK FLUID TEMPERATURE SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the TCM connector.








3. Check resistance between terminals.
OK or NG
OK >> GO TO 9.
NG >> GO TO 6.

6. CHECK HARNESS BETWEEN TCM AND TERMINAL CORD ASSEMBLY HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly harness connector and TCM connector.








3. Check continuity between terminal cord assembly harness connector terminal and TCM connector terminal.
4. If OK, check harness for short to ground and short to power.
5. If OK, check continuity between ground and transaxle assembly.
6. Reinstall any part removed.
OK or NG
OK >> GO TO 7.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.

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








3. Check resistance between terminal cord assembly terminals.
4. Reinstall any part removed.
OK or NG
OK >> GO TO 8.
NG >> Repair or replace damaged parts.

8. DETECT MALFUNCTIONING ITEM
1. Remove oil pan.
2. Check the following items:
- A/T fluid temperature sensor








^ Check resistance between terminal cord assembly harness connector terminals while changing temperature as shown.
- Harness of terminal cord assembly for short or open
OK or NG
OK >> GO TO 9.
NG >> Repair or replace damaged parts.

9. CHECK DTC
Perform "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 10.

10. CHECK TCM
1. Check TCM input/output signal. Refer to AT-71, "TCM Terminal and Reference Value". RE4F03B 4 Speed Automatic Transmission
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.

Component Inspection

A/T FLUID TEMPERATURE SENSOR








- Remove oil pan.
- Check resistance between terminal cord assembly harness connector terminals while changing temperature as shown.