DTC P2848: Shift Fork D Position Circuit (Performance) (DCT)
General Description
The shift fork D position sensor detects the stroke amount of 6-8 shift fork according to the output voltage. The powertrain control module (PCM) sends a 5 V reference signal to the sensor through a pull-up resistor. The shift fork D position sensor outputs a voltage of about 1 V when the 8th gear is engaged, about 4 V when the 6th gear is engaged, and about 2.5 V when it is in neutral position. The PCM compares the synchro position which estimated from the speed difference between output shaft speed and even gear shaft speed sensor, and the stroke value of the shift fork D position sensor to detect corresponding malfunction. If the stroke value of the shift fork D position sensor is out of specified range at either estimated synchro positions 6th or 8th gear, or at neutral, or if the stroke value of the shift fork D position sensor during the 6th or 8th gear engagement/disengagement action is in a specified range even the engagement/disengagement action is repeated, 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*, 12 seconds or less**, 5 seconds or less*** |
| DTC Type | Two drive cycles, MIL on, A/T gear position indicator blinks |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
*: Malfunction detection at 6th or 8th gear engagement, or at neutral
**: Malfunction detection during 6th or 8th gear engagement action
***: Malfunction detection during 6th or 8th gear disengagement action
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Engine speed [Engine Speed] | 500 rpm | - |
| Vehicle speed [Vehicle Speed] | 7 mph (10 km/h) | - |
| 12 volt battery voltage [Battery Voltage] | 11 V | - |
| Shift lever position | D | |
| Target gear position | 6th gear, 8th gear, 6th gear > Neutral, 8th gear > Neutral | |
| 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, P0871, 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, P0845, P2846, P2847 | |
[ ]: HDS Parameter
Malfunction Threshold
Malfunction detection at 6th or 8th gear engagement, or at neutral:
- The stroke value of shift fork D position sensor is less than 0.2362 in (6 mm) or more than 0.4724 in (12 mm) when the estimated synchro position is determined as 6th gear engagement condition.
- The stroke value of shift fork D position sensor is less than -0.4724 in (-12 mm) or more than -0.2362 in (-6 mm) when the estimated synchro position is determined as 8th gear engagement condition.
- The stroke value of shift fork D position sensor is less than -0.1181 in (-3 mm) or more than 0.1181 in (3 mm) when the estimated synchro position is determined as neutral position.
Malfunction detection during 6th gear engagement/disengagement action:
- The stroke value of the shift fork D position sensor is in the range shown in figure 1-A when the engagement action is repeated for 3 times during 6th gear engagement action.
- The stroke value of the shift fork D position sensor is in the range shown in figure 1-B when the disengagement action is repeated for 3 times during 6th gear disengagement action.
Malfunction detection during 8th gear engagement/disengagement action:
- The stroke value of the shift fork D position sensor is in the range shown in figure 2-A when the engagement action is repeated for 3 times during 8th gear engagement action.
- The stroke value of the shift fork D position sensor is in the range shown in figure 2-B when the disengagement action is repeated for 3 times during 8th gear disengagement action.
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.
- Shift fork D position sensor STRKD line short to ground
- Shift fork D position sensor failure
- PCM internal circuit failure
Confirmation Procedure
Operating Condition
- 1.
Start the engine.
- 2.
Shift to D position/mode, and drive the vehicle so that it shifts from 1st to 8th gear.
- 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.