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P0731 1GR INCORRECT RATIO TM-179 < DTC/CIRCUIT DIAGNOSIS > [5AT: RE5R05A] C E F G H I J K L M A B TM N O P P0731 1GR INCORRECT RATIO Description INFOID:0000000009480530 This malfunction is detected when the A/T does not shift into 1GR position as instructed by TCM. This is not only caused by electrical malfunction (circuits open or shorted) but mechanical malfunction such as control valve sticking, improper solenoid valve operation. On Board Diagnosis Logic INFOID:0000000009480531 • This is an OBD-II self-diagnostic item. • Diagnostic trouble code “P0731” with CONSULT or 18th judgment flicker without CONSULT is detected when TCM detects any inconsistency in the actual gear ratio. Possible Cause INFOID:0000000009480532 • Input clutch solenoid valve • Front brake solenoid valve • Direct clutch solenoid valve • High and low reverse clutch solenoid valve • Each clutch • Hydraulic control circuit DTC Confirmation Procedure INFOID:0000000009480533 CAUTION: Always drive vehicle at a safe speed. NOTE: If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and wait at least 10 seconds before performing the next test. After the repair, perform the following procedure to confirm the malfunction is eliminated. WITH CONSULT 1. Start the engine and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT. 2. Make sure that “ATF TEMP 1” is within the following range. ATF TEMP 1: 20 °C – 180°C (68°F – 356°F) If out of range, drive vehicle to warm ATF or stop engine to cool ATF. 3. Select “1ST GR FNCTN P0731” of “DTC & SRT CONFIRMATION” mode for “TRANSMISSION” with CONSULT. 4. Drive vehicle and maintain the following conditions. SLCT LVR POSI: “1” position GEAR: “1” position ACCELE POSI: 0.6/8 or more VEHICLE SPEED: 10 km/h (6 MPH) or more ENGINE SPEED: INPUT SPEED − 50 rpm or more INPUT SPEED: 300 rpm or more 5. Keep the current driving status for at least 5 consecutive seconds if CONSULT screen changes from “OUT OF CONDITION” to “TESTING”. CAUTION: If “TESTING” does not appear on CONSULT for a long time, select “SELF-DIAG RESULTS”. In case a 1st trip DTC other than P0731 is shown, refer to TM-157, "CONSULT Function (TRANSMISSION)" . If “COMPLETED RESULT NG” is detected, go to . If “STOP VEHICLE” is detected, go to the following step. 6. Stop vehicle. 7. Drive vehicle in “D” position allowing it to shift from 1GR to 5GR and check shift timing and shift shock. - Touch “OK” to complete the inspection when normally shifted from the 1GR to 5GR. - Touch “NG” when an unusual shift shock, etc. occurs in spite of shifting from the 1GR to 5GR. Go to 279, "Check Before Engine Is Started" - Perform TM-157, "CONSULT Function (TRANSMISSION)" when not shifted from the 1GR to 5GR. (Nei- ther “OK” nor “NG” are indicated.) WITH GST 1. Start the engine. |