DTC Advanced Diagnostics: P0842, P0843 (L15B7/L15BA/L15BY)

DTC Advanced Diagnostics: P0842, P0843

DTC P0842:Transmission Fluid Pressure Sensor/Switch "A" Circuit Low
DTC P0843:Transmission Fluid Pressure Sensor/Switch "A" Circuit High

General Description

The CVT driven pulley pressure sensor uses a strain gauge. The output voltage changes depending on the driven pulley pressure. The transmission control module (TCM) sends a 5 V reference voltage to the sensor through a pull-up resistor. When the driven pulley pressure is low, the sensor resistance decreases and the TCM detects a low signal voltage. Conversely, when the driven pulley pressure is high, the sensor resistance increases and the TCM detects a high signal voltage. If the CVT driven pulley pressure sensor signal voltage is a specified voltage for a set time, the TCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	10 seconds or more
DTC Type	Two drive cycles, MIL off, Shift position indicator blinks

Enable Conditions

Condition
State of the engine	Running

Malfunction Threshold

DTC: P0842

The CVT driven pulley pressure sensor output voltage [Driven Pulley Pressure Sensor(V)] is less than 0.21 V for at least 10 seconds.

DTC: P0843

The CVT driven pulley pressure sensor output voltage [Driven Pulley Pressure Sensor(V)] is more than 4.84 V for at least 10 seconds.

[ ]: HDS Parameter

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.

DTC: P0842

CVT driven pulley pressure sensor PDN line short to ground

DTC: P0843

	CVT driven pulley pressure sensor PDN line open (includes connector loose connection or disconnection)
	CVT driven pulley pressure sensor SG line open (includes connector loose connection or disconnection)

Common

	CVT driven pulley pressure sensor VCC line open (includes connector loose connection or disconnection)
	CVT driven pulley pressure sensor failure
	TCM internal circuit failure

Confirmation Procedure

Operating Condition

1.	Start the engine.
2.	Shift to P position/mode, and wait for at least 10 seconds.
3.	Turn the vehicle to the OFF (LOCK) mode.
4.	Repeat Driving Pattern steps 1 through 2.

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 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.