DTC P0871: Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance (DCT)
General Description
The reverse clutch pressure sensor uses a strain gauge. The output voltage changes depending on the reverse clutch pressure. The powertrain control module (PCM) sends a 5 V reference voltage to the sensor through a pull-up resistor. When the reverse clutch pressure is low, the sensor resistance decreases and the PCM detects a low signal voltage. Conversely, when the reverse clutch pressure is high, the sensor resistance increases and the PCM detects a high signal voltage. If the reverse clutch pressure sensor is in abnormal pressure range, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
| Execution | Continuous |
| Sequence | None |
| Duration | 2 seconds or less |
| DTC Type | Two drive cycles, MIL on, A/T gear position indicator blinks |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery Voltage] | 11 V | - |
| No active DTCs set (prevents monitor from running) | P0716, P0717, P0718, P0721, P0722, P0723, P0746, P0747, P0751, P0752, P0756, P0757, P0761, P0762, P0766, P0767, P0771, P0772, P0776, P0777, P0792, P0793, P0794, P0796, P0797, P0841, P0842, P0843, P0846, P0847, P0848, P0872, P0873, P0962, P0963, P0966, P0967, P0970, P0971, P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983, P0985, P0986, P2714, P2715, P2720, P2721, P2729, P2730, P2746, P2747, P2748, P2820, P2821, P2826, P2827, P2832, P2833, P2834, P2837, P2838, P2839, P283C, P283D, P283E, P2841, P2842, P2843, P2845, P2846, P2847, P2848 | |
| Other | The commanded pressure value to the line pressure is 2, 000 kPa (20.39 kgf/cm2, 290 psi) or less | |
[ ]: HDS Parameter
Malfunction Threshold
One of these conditions occurs:
- The reverse clutch pressure sensor is 200 kPa (2.04 kgf/cm 2, 29 psi) or more from the commanded pressure value (line pressure control solenoid valve pressure) to the reverse clutch when the gear is engaged.
- The reverse clutch pressure sensor is -200 kPa (-2.04 kgf/cm 2, -29 psi) or more from the commanded pressure value (line pressure control solenoid valve pressure) to the reverse clutch when the gear is engaged.
- The reverse clutch pressure sensor is 200 kPa (2.04 kgf/cm 2, 29 psi) or more when the reverse clutch is disengaged.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Reverse clutch pressure sensor PCLR line open (includes connector loose connection or disconnection)
- Reverse clutch pressure sensor failure
- PCM internal circuit failure
Confirmation Procedure
Operating Condition
- 1.
Start the engine.
- 2.
Drive the vehicle in reverse gear for at least 2 seconds.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.