P059

DTC PO59:

PCM Circuits:

CIRCUIT DESCRIPTION
The transaxle temperature sensor is a thermistor, or variable resistor whose resistance varies based on its temperature. As the temperature of the sensor increases, its resistance decreases. A low transaxle temperature will result in high signal voltage on CKT 585. Code P059 sets when the Powertrain Control Module (PCM) sees a transaxle temperature sensor reading of -35°C or less (4.95 volts or greater).

TEST CONDITIONS
1. Codes P014, P015 and P024 not set.
2. Coolant temperature -25°C or greater.
3. 0 seconds must elapse with engine running and vehicle speed must be 0 mph or greater.

FAILURE CONDITION
Transaxle temperature sensor -35°C or less for 6 seconds.

ACTION TAKEN
1. PCM turns "ON" the Malfunction Indicator Lamp (MIL) (Service Engine Soon) message.
2. PCM will substitute 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 PD77 will read -35°C or less. If the parameter does not show this, then the sensor and wiring are OK.
2. Checking for an open in CKT 585 between the PCM and connector "C129." If PD77 shows 148-151°C with the "C129" terminal "M" jumpered to ground, then CKT 585 and PCM are OK.
3. Checking CKT 452 for an open to PCM terminal "2D1."
4. Checking the PCM's ability to recognize low voltage on terminal "1B14," transaxle temperature sensor input. If grounding terminal "1B14" causes PD77 to show 148-151°C, then there is an open in CKT 585 between the PCM and connector "C129."
5. Checking for an open transaxle temperature sensor.