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

TCM TERMINALS AND REFERENCE VALUE





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 position, vehicle speed higher than 20 km/h (12 MPH).

Without CONSULT-II





^ Follow the procedure "With CONSULT-II".

AT-BA/FTS-01:

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 harness connectors M77, M78 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.
NO >> Check the following items
^ Harness for short or open between fuse block J/B harness and TCM terminals (10, 19 and 28) (Main harness)
^ Ignition switch and fuse.

2. 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 terminals 6 and 7 when A/T is cold [20°C (68°F)].

Is resistance approximately 2.5 k ohms?
Yes >> GO TO 3.
No >>
1. Remove oil pan.
2. Check the following items:
^ A/T fluid temperature sensor
^ Harness of terminal cord assembly for short or open

3. CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR
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 1.5 volts
Hot [80°C (176°F)]: 0.5 Volts

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 1.5 Volts
Hot [80°C (176°F)] 0.5 Volts

OK or NG
OK >> GO TO 4.
NG >> Check the following item:
^ Harness for short or open between TCM and terminal cord assembly (Main harness)

4. CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure.

OK or NG
OK >> INSPECTION END.
NG >>
^ Perform TCM input/output signal inspection.
^ If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

Component Inspection
A/T FLUID TEMPERATURE SENSOR








^ For removal, refer to "Control Valve Assembly and Accumulators".
^ Check resistance between terminals 6 and 7 while changing temperature as shown at left.