DTC P0846

DTC P0846: Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance

General Description

Courtesy of HONDA, U.S.A., INC.

The even clutch pressure sensor uses a strain gauge. The output voltage changes depending on the main clutch pressure. The powertrain control module (PCM) sends a 5 V reference voltage to the sensor through a pull-up resistor. When the main clutch pressure is low, the sensor resistance decreases and the PCM detects a low signal voltage. Conversely, when the main clutch pressure is high, the sensor resistance increases and the PCM detects a high signal voltage. If the even 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
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, 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, P2845, P2846, P2847, P2848
Other	Not during synchro control
Other	The commanded pressure value to the main clutch pressure is 1, 000 kPa (10.19 kgf/cm2, 145 psi) or less

[ ]: HDS Parameter

Malfunction Threshold

One of these conditions occurs:

The even clutch pressure sensor is 200 kPa (2.04 kgf/cm2, 29 psi) or more from the commanded pressure value (clutch pressure control solenoid valve B pressure) to the main clutch when the gear is engaged.
The even clutch pressure sensor is -200 kPa (-2.04 kgf/cm2, -29 psi) or more from the commanded pressure value (clutch pressure control solenoid valve B pressure) to the main clutch when the gear is engaged.
The even clutch pressure sensor is 200 kPa (2.04 kgf/cm2, 29 psi) or more from the commanded pressure value (line pressure control solenoid valve pressure) to the line pressure during shift change.
The even clutch pressure sensor is 200 kPa (2.04 kgf/cm2, 29 psi) or more when the main 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.

Even clutch pressure sensor PCL2 line open (includes connector loose connection or disconnection)
Even clutch pressure sensor failure
PCM internal circuit failure

Confirmation Procedure

With the HDS

None.

With the Driving Pattern

Start the engine.
Drive the vehicle in 2nd gear for at least 2 seconds.

Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

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 battery.