DTC 57

DTC 57 Chart:

Transaxle Fluid Temperature (TFT) Sensor Circuit:

CIRCUIT DESCRIPTION
The Transmission Fluid Temperature (TFT) sensor is a thermistor that controls the signal voltage to the PCM. The PCM supplies a 5 volt reference signal to the sensor on CKT 585. When the transaxle fluid is cold, the sensor resistance is high and the PCM will sense high signal voltage.
As the transaxle fluid temperature warms to normal operating temperature of 100°C (212°F), the sensor resistance becomes less and the voltage decreases to approximately 1.5 to 2.0 volts.

DTC 57 WILL SET WHEN
- Signal voltage indicates TFT greater than 148°C (298°F).
- Condition is met for 5 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
- DTC 57 does not illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon).
- The PCM substitutes the engine coolant temperature value for the transaxle until engine temperature reaches 115°C (239°F), then the transaxle will be set to hot mode operation.

DTC 57 WILL CLEAR WHEN
The fault no longer exists and the ignition is cycled "OFF" and "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks for a shorted sensor wire.
2. This test checks the PCM and connectors.

DIAGNOSTIC AIDS
This test checks for abnormally high temperature if the sensor circuit becomes shorted. This DTC may result from degraded trans. fluid. Refer to Tech 1 display "transaxle oil life" in Typical Scan Data Values. Scan Tool Data List