P059

Code Chart P059:

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. Code P059 sets when the PCM sees a transaxle temperature sensor reading of 14°C or less (4.95 volts or greater).

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 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. With the transaxle temperature sensor or wiring open circuited PCM data PD19 will read 14°C or less. 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 PD77 shows 264° - 267°C 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 the PCM's ability to recognize low voltage on terminal "3F12" transaxle temperature sensor input. If grounding terminal "3F12" causes PD19 to show 264° - 267°C, then there is an open is CKT 585 between the PCM and transaxle connector.

5. Checks for an open transaxle temperature sensor.