Code No. P0736: Reverse Gear Incorrect Ratio
DIAGNOSIS CODE SET CONDITIONS
*1
note | *1 The actual gear ratio deviates from the target gear ratio to the high engine (turbine) speed. |
PROBABLE CAUSES
- Transmission 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 PROCEDURE |
STEP 1. Check the diagnosis code. |
Check that P0715 (input shaft speed sensor) and P0720 (output shaft speed sensor) are set. |
Q.
Is the diagnosis code set?
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Check and repair the relevant diagnosis code system. |
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Go to Step 2. |
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STEP 2. Check the diagnosis code. |
Check if the diagnosis code other than P0736 (Reverse gear ratio) is set. |
Q.
Is the diagnosis code set?
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Check and repair the relevant diagnosis code system. |
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Go to Step 3. |
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STEP 3. Check the A/T fluid properties. |
Check the status of the A/T fluid properties (smell, colour, fouling). |
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Q.
Is the check result normal?
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Go to Step 4. |
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Remove the A/T from the vehicle, then check and repair the inside. |
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STEP 4. Check the A/T fluid level. |
Q.
Is the check result normal?
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Adjust the A/T fluid level, and then go to Step 5. |
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Go to Step 5. |
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STEP 5. Check the signals of input shaft speed sensor and output shaft speed sensor. |
Check the signals of C-137 A/T-ECU connector terminal No. 37 and No. 38. |
Refer to . |
Q.
Is the check result normal?
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Go to Step 6. |
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Repair or replace the failure section. |
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STEP 6. Hydraulic pressure test |
Refer to . |
Q.
Is the check result normal?
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Go to Step 7. |
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Remove the A/T from the vehicle, then check and repair the inside. |
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STEP 7. Erase the diagnosis code, and drive the vehicle for a while. |
Check that the normal code is displayed. |
Q.
Is the check result normal?
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The procedure is complete. |
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Return to START. |
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