P059

DTC PO59:

Transaxle Circuit:

CIRCUIT DESCRIPTION
The transaxle temperature sensor is a thermistor whose resistance varies based on its temperature. As the temperature of the sensor increases, its resistance decreases. A low transaxle temperature will result in a high signal voltage on CKT 585. The Powertrain Control Module (PCM) converts the signal voltage on CKT 585 to a value of degrees Celsius. PCM data PD19 displays the degrees Celsius value.

TEST CONDITIONS
1. Codes PO14, PO15 and PO24 not set.
2. Coolant temperature -25°C or greater.
3. Engine running and vehicle moving for 5 minutes.

FAILURE CONDITIONS
Transaxle temperature sensor value (PD14) is 14°C or less for 6 seconds.

ACTION TAKEN
1. PCM turns "ON" the Malfunction Indicator Lamp (MIL) "Service Engine Soon" message.
2. The PCM substitutes the coolant temperature value for transaxle temperature until coolant temperature reaches 105°C, then the transaxle will be set to "Hot Mode" operation.

NOTES ON FAULT TREE
1. PCM data PD19 will display 14 or less with an open circuit. PCM data PD19 will display 264 or more with a shorted circuit. If the parameter does not show this, the sensor and wiring are OK.

2. Checks for an open in CKT 585 between the PCM and transaxle connector. If PD19 displays 264 or more with the transaxle connector terminal "F" jumpered to ground, then CKT 585 and PCM are OK.

3. Checks CKT 808 for an open to PCM terminal "3E11."

4. Checks for an open transaxle temperature sensor.