Transmission Control Systems

DTC 21 ATF Temperature Sensor:

ATF Temperature Sensor Circuit:

1. MEASURE SIGNAL VOLTAGE INPUT OF TCM.
a. Turn ignition switch ON (with engine OFF) and measure signal voltage input of TCM.
b. Start and warm up the engine. Measure signal voltage input of TCM.

Specified value (B67) No.10 - (B66) No.20:
- ATF temperature 20°C (6°F) - 1.4 - 1.7 Volts
- ATF temperature 80°C (176°F) - 0.3 - 0.6 Volt

2. CHECK HARNESS BETWEEN TCM AND ATF TEMPERATURE SENSOR.
a. Disconnect connector from TCM.
b. Disconnect connector from transmission.
c. Measure resistance between TCM connector and transmission connector, and between TCM connector and body.

Specified value:
- (B67) No.10 - (B14) No.5: 0 Ohms
- (B67) No.10 - Body: 1 M Ohm, min.
- (B66) No.20 - (B14) No.12: 0 Ohms

3. CHECK ATF TEMPERATURE SENSOR.
a. Disconnect connector from transmission.
b. Measure resistance between transmission connector receptacle's terminals.

Specified value (T2) No.5 - No.12:
- ATF temperature: 20°C (68°F) - 2.3 - 2.7 K Ohms


c. Connect connector to transmission, and warm up the engine to increase ATF temperature.
d. Stop the engine and disconnect connector from transmission.
e. Measure resistance between transmission connector receptacle's terminals.

Specified value (T2) No.5 - No.12:
- ATF temperature: 80°C (176°F) - 280 - 360 Ohms