For 1990-2009 cars

### Circuit Description

The transaxle control module (TCM) calculates gear ratio based on the transaxle input and output speeds. The TCM compares the known gear ratio to the calculated ratio for commanded gear. When the TCM detects an unknown gear ratio when 1st gear is commanded DTC P0731 sets.

### Conditions for Setting the DTC

DTC P0731 will set if one of the following ratios is detected for:

when the following conditions have been met:

• | TP Angle is greater than 8%

• | Engine is running

• | Trans. Fluid Temp is between 21°C (70°F) and 130°C (266°F)

• | Engine torque greater than 2 ft-lbs

• | Commanded ratio = 1st gear

• | No engine torque default

• | Time since last manual range change greater than 6 seconds

• | Vehicle Speed is greater than 5 km/h (3 mph)

• | TFP Range is not Park/Neutral

• | No TP Angle DTCs have set

P0731 is a (type C) DTC.

### Diagnostic Aids

• | Check for improper transaxle operation per the chart on facing page.

• | Check for an incorrect calibration.