DTC Advanced Diagnostics: P0736
DTC P0736 : RVS Gear Incorrect Ratio
General Description
Two-way clutch position required to shift in each shift position/mode
| Shift position/mode | One-way clutch function | Lock function |
|---|---|---|
| P | YES | YES |
| R | NO | YES |
| N | YES | YES |
| D (1st gear*) | YES | YES |
| D (2nd to 10th gear) | YES | NO |
*: Possible to shift regardless of the two-way clutch position
The two-way clutch switches forward and reverse by switching to one-way clutch function that idles one side and lock function that disables idle both sides. The two-way clutch switches forward and reverse by driving two-way clutch actuator valve with shift solenoid valves A, B, and D, and clutch pressure control solenoid valve B. The two-way clutch switching position is monitored by the two-way clutch actuator valve stroke sensor which measures the stroke position of the two-way clutch actuator valve. The two-way clutch position that is required to shift in each shift position/mode is shown in the table. If all of the following conditions are established for a specified time when steady driving at reverse, the transmission control module (TCM) detects a malfunction and stores DTC.
- The actual gear ratio calculated from the values of the mainshaft speed sensor and the countershaft speed sensor is a specified value.
- The rotation speed measured by the mainshaft speed sensor is a specified value and the torque converter slip rate is a specified value.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or more |
| DTC Type | Two drive cycles, MIL off, shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Vehicle speed [Vehicle Speed] | - | 1 mph (3 km/h) | |
| 12 volt battery voltage [Battery Voltage] | 10 V | - | |
| Other | Steady driving at reverse gear | ||
| All transmission fluid pressure sensor value of the engaged clutch/brake must be 350 kPa (3.57 kgf/cm 2, 50.8 psi) or more | |||
[ ]:HDS Parameter
Malfunction Threshold
All of the following conditions are established for at least 1 second when steady driving at reverse:
- The actual gear ratio is more than 1.81, or less than 1.48.
- The rotation speed measured by the mainshaft speed sensor is 370 rpm or more and the torque converter slip rate is 73 % or more.
Possible Cause
- Transmission internal failure (two-way clutch)
Confirmation Procedure
Operating Condition
- Start the engine.
- While pressing the brake pedal, shift the transmission to R position/mode.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the TCM memory. If the malfunction returns in the next (second) drive cycle, the shift position indicator blinks and a Confirmed DTC and the freeze data are stored. The MIL does not come on.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.