DTC Advanced Diagnostics: P084C
DTC P084C : Transmission Fluid Pressure Switch B Circuit Low
General Description
Transmission fluid pressure switch B is installed on the hydraulic pressure output passage of shift solenoid valve A. When shift solenoid valve A outputs a hydraulic pressure, transmission fluid pressure switch B is ON, and OFF when there is no hydraulic pressure. In the condition the two-way clutch control (forward to reverse switching) is functioning normally, if transmission fluid pressure switch B outputs OFF for a specified time when shift solenoid valve A is controlled ON, the transmission control module (TCM) detects a malfunction and stores DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1.5 seconds or more |
| DTC Type | Two drive cycles, MIL off, shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Engine speed [Engine Speed] | 500 rpm | - | |
| 12 volt battery voltage [Battery Voltage] | 10 V | - | |
| Control command to shift solenoid valve A | ON | ||
| Other | Two-way clutch control (forward to reverse switching) is functioning normally | ||
[ ]: HDS Parameter
Malfunction Threshold
Transmission fluid pressure switch B outputs OFF for at least 1.5 seconds when shift solenoid valve A is controlled ON.
Possible Cause
- Valve body assembly failure (transmission fluid pressure switch B circuit low)
Confirmation Procedure
Operating Condition
- Start the engine.
- Test-drive the vehicle from 1st gear to 2nd gear, then slow down and stop the vehicle.
- While pressing the brake pedal, shift the transmission to R position/mode.
- 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 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.