P0712

Wiring Diagram:

The transaxle fluid temperature (TFT) sensor circuit monitors transaxle fluid temperature by using a thermistor - type sensor located in a transaxle pressure port near the pressure filter. Sensor resistance will increase as temperature decreases and decreases as the temperature increases. The PCM/TC supplies a five volt signal to circuit 586 and monitors the voltage on the internal signal line as it varies up and down with circuit resistance. The voltage value on the signal line is converted to a temperature value.

DTC PARAMETERS
DTC P0712 is set when the PCM/TC has detected the following conditions for longer than 30 seconds:
- Engine coolant temperature below 100°C (212°F).
- Sensor reading is above 140°C (284°F).

TEST DESCRIPTION
Numbered steps below refer to numbered steps on chart.

IMPORTANT: High temperature equals low sensor resistance.

1. This step verifies the problem is still present. If Scan tool indicates temperature is less than 140°C (248°F) the conditions for DTC P0712 are not currently present.
2. This step simulates a DTC P0713 - (TFT) sensor circuit Open (Cold). If the PCM recognizes the high signal (low temperature) and the Scan tool reads less than -37°C (-35°F) the PCM and wiring are OK. With ignition On five volts at sensor harness terminal for circuit 586 indicates PCM and circuit 586 are OK.

REPAIR VERIFICATION
Monitor DTC menu "Code Status" for "Pass Since Code Clear" and "Pass This Ignition Cycle." When both have passed, repair is verified.

Criteria for pass:
- Same as fail criteria
- Criteria OK for 100 seconds

DIAGNOSTIC AIDS
DTC P0712 is not set when the transaxle is overheated. That would cause DTC P0218 - Hot Lamp Illuminated to set.
IMPORTANT: The PCM uses two internal circuits to identify transaxle temperature. One circuit is used for temperatures of 48°C (118°F) and below. If either circuit has failed the DTC will set, however, the temperature may look normal in the other range.

Test low scale with engine at room temperature and high scale with engine at normal operating temperature (above 70°C [158°F]).