P0731 Saturn - Gear 1 Incorrect 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?
P0731 is detected when A/T cannot be shifted to the 1st gear position even if electrical circuit is good.
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting
P0731 Saturn 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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SATURN Technical Service Bulletins for P0731 code
1998 SATURN S-SERIES Power Train Details
1999 SATURN S-SERIES Power Train Details
2000 SATURN S-SERIES Power Train Details
2001 SATURN S-SERIES Power Train Details
2002 SATURN S-SERIES Power Train Details
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