Transmission Controls With PCM

Diagnostic Chart:

Circuit Schematic:

TRANSAXLE TEMPERATURE CIRCUIT GROUNDED (HOT)
The transaxle temperature circuit monitors transaxle fluid temperature by using a thermistor (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 585 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 32 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.

NOTE: 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 32 are not currently present.
2. This step simulates a DTC 31 - Transaxle Temperature 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 IGN on five volts at sensor harness terminal for circuit 585 indicates PCM and circuit 585 are OK.

DIAGNOSTIC AIDS
When attempting to diagnose an intermittent problem use the Scan tool[1] to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

Check the tightness of the female terminal grip with a spare male terminal.

^ DTC 32 is not set on overheated transaxle. That would cause information flag 15 Hot Lamp illuminated to set.

[1] Select Malfunction History from Scan tool TCM menu.