P0735

P0735 5Gr Incorrect Ratio

Description

This malfunction is detected when the A/T does not shift into 5GR 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

- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0735" with SDT or 22nd judgment flicker without SDT is detected when TCM detects any inconsistency in the actual gear ratio.

Possible Cause

- 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

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 SDT

1 Start the engine and select "Data list" mode for "AT" with SDT.
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 "5TH GR FNCTN P0735" of "Utility (Readiness test / DTC work support)" mode for "AT" with SDT.
4 Drive vehicle and maintain the following conditions.
SLCT LVR POSI: "D" position
GEAR: "5" 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 SDT screen changes from "OUT OF CONDITION" to "TESTING".

CAUTION:
If "TESTING" does not appear on SDT for a long time, select "DTC check". In case a 1st trip DTC other than P0735 is shown, refer to [SDT Function (AT)] Scan Tool Testing and Procedures.

If "COMPLETED RESULT NG" is detected, go to "Diagnosis Procedure".
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 [Road Test: Check Before Engine is Started] Road Test: Check Before Engine is Started.
- Perform [SDT Function (AT)] Scan Tool Testing and Procedures when not shifted from the 1GR to 5GR. (Neither "OK" nor "NG" are indicated.)

with GST

1 Start the engine.
2 Drive vehicle for approximately 5 minutes in urban areas.
3 Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.
Selector lever: "D" position
Gear position: "5" position
Accelerator opening: 0.6/8 or more
Vehicle speed: 10 km/h (6 MPH) or more
4 Check DTC.
5 If DTC is detected, go to "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK CAN COMMUNICATION LINE

Perform "DTC check". Refer to [SDT Function (AT)] Scan Tool Testing and Procedures , [Diagnosis Procedure without SDT] Diagnosis Procedure without SDT.

Is a malfunction in the CAN communication indicated in the results?
YES
Check CAN communication line. Refer to [U1000 CAN COMM Circuit] Automatic Transmission/Transaxle.
NO
GO TO 2.

2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to [Main Power Supply and Ground Circuit Check] Main Power Supply and Ground Circuit Check.

OK or NG
OK
GO TO 3.
NG
Repair or replace damaged parts.

3. DETECT MALFUNCTION ITEM

Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

OK or NG
OK
GO TO 4.
NG
Repair or replace damaged parts.

4. REPLACE CONTROL VALVE WITH TCM

1 Replace control valve with TCM. Refer to [Control Valve with TCM: Removal and Installation] Service and Repair.
2 Perform "DTC Confirmation Procedure".

OK or NG
OK
INSPECTION END
NG
Confirm malfunction phenomena by "ROAD TEST" to repair malfunctioning part. Refer to [Road Test: Check Before Engine is Started] Road Test: Check Before Engine is Started.