P0731 Ford - Incorrect First Gear Ratio
Repair Importance Level:
Repair Difficulty Level:
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
Start by inspecting the transmission fluid level and condition, and change fluid if necessary.
When is the code detected?
Transmission in first gear and the ECM detected an incorrect gear ration
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting
P0731 Ford Description
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
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FORD Technical Service Bulletins for P0731 code
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