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Condition TCM outputs solenoid pattern of 1st gear when gear ratio is other than 1st gear. Possible causes are: Low ATF level. Low line pressure. Control valve stuck. Solenoid valve malfunction. TCM malfunction. Diagnosis & Repair Procedure 1. Ensure ATF level and condition is okay. Check line pressure and stall speed. See LINE PRESSURE TEST and STALL SPEED under TESTING in MAZDA NC4A-EL OVERHAUL article. Repair any 2. Inspect 1-2, 2-3 and 3-4 shift solenoid valves. See SOLENOID VALVES under COMPONENT TESTING. Repair as needed. If solenoid valves are okay, go to next step. 3. Inspect valve body. Ensure all valves operate smoothly. Repair as needed. If valve body is okay, go to next step. 4. Clear DTC and retest. See CLEARING CODES . If code P0731 is still present, replace TCM. If code is no longer present and symptom still exists, problem may be caused by intermittent clutch slippage. DTC P0732: INCORRECT 2ND GEAR RATIO Condition TCM outputs solenoid pattern of 2nd gear when gear ratio is other than 2nd gear. Possible causes are: Low ATF level. Direct clutch slippage. One-way clutch slippage. Faulty band servo. Low line pressure. Control valve stuck. Solenoid valve malfunction. TCM malfunction. Diagnosis & Repair Procedure NOTE: If any following DTC is also present, repair it first and then proceed with this
1997 Mazda MX-5 Miata 1997 AUTOMATIC TRANSMISSIONS NC4A-EL Electronic Controls
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