DTC P0731 Acura
Problem in 1st Clutch and 1st Clutch Hydraulic Circuit (1st gear incorrect ratio)
Problem in 1st Clutch and 1st Clutch Hydraulic Circuit (1st gear incorrect ratio)
Description
The Powertrain Control Module (PCM) computes the ratio of the input shaft (mainshaft) speed to the output shaft (countershaft) speed. When the ratio is not the 1st gear ratio, it is detected as a malfunction of the hydraulic circuit or the 1st clutch. (Symptom 1) The actual gear ratio must match one of these conditions for at least 12 seconds with the 1st gear command: Actual gear ratio is greater than the 1st gear ratio by a factor of 1.2 Actual gear ratio is less than the 1st gear ratio by a factor of 0.75 (Symptom 2) The actual gear position is neutral for at least 3 seconds and then the gear up-shifted from 2nd to 3rd, even though 1st gear shift is commanded. NOTE: Before you troubleshoot, record all freeze data and any on-board. snapshot,
Cause and Solution
Low or dirty transmission fluid
Faulty shift valves B and C
Faulty ATF pump and the regulator valve
Inspect the strainer for metal debris or excessive clutch material, if present
Video Guide
Diagnostic Info
- DTC Code: P0731
- Brand: Acura