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
^ Continuous

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ Not applicable

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
Start the engine, and drive in "R" range at 15 km/h (9 mph) or more for 10 seconds.

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.
Pinout Values and Diagnostic Parameters
Q: Is the check result normal?
YES: Go to Step 6.
NO: Repair or replace the failure section.

STEP 6. Hydraulic pressure test
Hydraulic Pressure Tests
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.