P0736

DTC P0736: Reverse Gear Incorrect Ratio

DESCRIPTIONS OF MONITOR METHODS

Check Conditions, Judgement Criteria

- During reverse driving, engine run-up*1 is detected for 250 milliseconds or more.
*1: The actual gear ratio deviates from the target gear ratio to the high engine (turbine) speed.

MONITOR EXECUTION

- Reverse gear driving

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- P0846: Malfunction of the 2-6 brake pressure switch system

- P0876: Malfunction of the High clutch pressure switch system

- P0988: Malfunction of the Low-reverse brake pressure switch system
Sensor (The sensor below is determined to be normal)

- Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions

- Shift stage: reverse gear.
Judgement Criteria

- Gear ratio: more than -3.457. (0.25 second)

OBD-II DRIVE CYCLE PATTERN

Reverse gear driving for 5 seconds or more

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)

- Transaxle assembly powertrain parts failure

- Malfunction of the P0715: input shaft speed sensor system

- Malfunction of the P0720: output shaft speed sensor system

- Malfunction of the P0748: line pressure linear solenoid valve system circuit

- Malfunction of the P0763: 3-5 reverse clutch linear solenoid valve system circuit

- Malfunction of the P0743: lock-up and low-reverse brake linear solenoid valve system circuit

- Malfunction of the P1758: low-reverse brake shift solenoid valve system circuit

- Malfunction of the 3-5 reverse clutch

- Malfunction of the low-reverse brake

- Malfunction of the valve body assembly

DIAGNOSIS

STEP 1. Check the DTC.

Check that P0715 (input shaft speed sensor) and P0720 (output shaft speed sensor) are set.

Q. Is the DTC set?

YES Check and repair the relevant DTC system.
NO Go to Step 2.
STEP 2. Check the DTC.

Check if the DTC other than P0736 (Reverse gear ratio) is set.

Q. Is the DTC set?

YES Check and repair the relevant DTC system.
NO Go to Step 3.
STEP 3. Check the transmission fluid properties.

Check the status of the transmission fluid properties (smell, color, fouling).

- Black: A/T inside damage, seizure

- Milky: Water intrusion

Q. Is the check result normal?

YES Go to Step 4.
NO Remove the A/T from the vehicle, then check and repair the inside.
STEP 4. Check the transmission fluid level.

Q. Is the check result normal?

YES Adjust the transmission fluid level, and then go to Step 5.
NO Go to Step 5.
STEP 5. Check the signals of input shaft speed sensor and output shaft speed sensor.

Check the signals of C-37 TCM connector terminal No. 37 and No. 38.

Refer to Automatic Transmission.

Q. Is the check result normal?

YES Go to Step 6.
NO Repair or replace the failure section.
STEP 6. Hydraulic pressure test

Refer to Hydraulic Pressure Test.

Q. Is the check result normal?

YES Go to Step 7.
NO Remove the A/T from the vehicle, then check and repair the inside.
STEP 7. Erase the DTC code, and drive the vehicle for a while.

Check that the normal code is displayed.

Q. Is the check result normal?

YES The procedure is complete.
NO Return to START.