DTC 59

DTC 59 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 59 WILL SET WHEN
- Signal voltage indicates TFT less than 35°C (-31°F).
- Engine operating.
- Engine coolant temperature greater than -25°C (-13°F).

ACTION TAKEN (PCM WILL DEFAULT TO)
- DTC 59 does not illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon).
- The PCM will substitute the coolant temperature value for the transaxle until engine temperature reaches 115°C (239°F), then the transaxle will be set to hot mode.

DTC 59 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 an open sensor or wire.
2. This test checks the signal from the PCM.
3. This test checks the sensor ground circuit.

DIAGNOSTIC AIDS
This test checks for abnormally low temperature if the sensor circuit is open. Check all connections for good contact.