DTC Advanced Diagnostics: P2818
DTC P2818:Shift Solenoid Valve O/P (Pressure Control Solenoid "H") Stuck On

General Description

Transmission fluid pump volume changes by shift solenoid valve O/P ON/OFF control
Transmission fluid pump volume
Shift Solenoid Valve O/P
High
OFF
Low
ON

The shift solenoid valve O/P controls the drain circuit close/open commanded by the transmission control module (TCM) ON/OFF commands. The transmission fluid pump volume is changed by switching the shift solenoid valve O/P ON/OFF control. The TCM commands the driver circuit to turn on the shift solenoid valve O/P. The TCM temporarily increases the driven pulley pressure up to target value. As the commanded driven pulley pressure reaches the target value, the TCM monitors the driven pulley pressure when the shift solenoid valve O/P is ON and OFF. If the driven pulley pressure does not change, or the pulley ratio is at a specified value when decelerated to a stop, the TCM detects a shift solenoid valve O/P stuck ON malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
None
Duration
10 seconds or less
DTC Type
Two drive cycles, MIL off, Shift position indicator blinks

Enable Conditions
Condition
Minimum
Maximum
Engine speed [Engine Speed]*
700 rpm
740 rpm
Transmission fluid temperature [CVTF Temperature]
248 °F (120 °C)*
–
194 °F (90 °C)**
–
Vehicle speed [Vehicle Speed]*
–
1 mph (3 km/h)
Acceleration**
-11.1 ft/s2 (-3.4 m/s2)
-7.6 ft/s2 (-2.3 m/s2)
Shift lever position/mode
D
Other
Accelerator pedal released*
Brake pedal pressed
*: Symptom 1
** : Symptom 2
[ ]: HDS Parameter

Malfunction Threshold
One of these symptoms occurs:

Symptom 1: Judgments 1 and 2 are executed sequentially, and if the driven pulley pressure does not change when the shift solenoid valve O/P [Shift Sol O/P] is ON and OFF.

Judgment
Shift solenoid valve O/P
Commanded driven pulley pressure
Driven pulley pressure
Detection time
1
OFF
About 1,961 kPa
(20.0 kgf/cm2, 284 psi)
About 1,177 kPa
(12.0 kgf/cm2, 171 psi)
5.0 seconds
2
ON
About 1,961 kPa
(20.0 kgf/cm2, 284 psi)
About 1,177 kPa
(12.0 kgf/cm2, 171 psi)
5.0 seconds

Symptom 2: The pulley ratio [Pulley Ratio] is less than 2.0 when the vehicle is stopped.

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 solenoid valve O/P stuck on

Confirmation Procedure
Operating Condition

1.
Start the engine.
2.
With the brake pedal pressed, place the shift lever in from N position/mode to D position/mode.
3.
Accelerate the vehicle to 25 mph (40 km/h).
4.
Stop and leave the vehicle for at least 10 seconds.
5.
Turn the vehicle to the OFF (LOCK) mode.
6.
Repeat Driving Pattern steps 1 through 4.
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 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.