DTC P0746

DTC P0746:  CVT Drive Pulley Pressure Control Solenoid Valve Stuck OFF

General Description 

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

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

The CVT drive pulley pressure control solenoid valve controls hydraulic pressure to the drive pulley. The CVT drive pulley pressure control solenoid valve is controlled by duty cycle output. The spool in the CVT drive pulley pressure control solenoid valve moves the valve according to the current, and produces hydraulic pressure in proportion to the current. To shift the transmission properly, the powertrain control module (PCM) outputs a drive pulley oil pressure control signal. If the pulley ratio is overdrive while the vehicle is stopped with the forward clutch engaged, and the estimated input torque when starting is a specified value or more and belt slippage does not occur when driving, the PCM detects a CVT drive pulley pressure control solenoid valve stuck OFF failure and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status 

Execution	Continuous
Sequence	None

Duration	Depending on the driving conditions
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
Engine speed [Engine Speed]		500 rpm	-
Vehicle speed [Vehicle Speed]*		-	3 mph (5 km/h)
Accelerator pedal position		-	2.7 deg.*
		4 deg.**	-
		30 deg.***	-
Shift lever position		D
No active DTCs set (prevents monitor from running)		P0501, P0502, P0705, P0706, P0716, P0717, P0777, P0780, P0792, P0793, P0796, P0962, P0963, P0966, P0967, P0970, P0971, P1898, P1899

*: Symptom 1

**: Symptom 2-A

***: Symptom 2-B

[ ]: HDS Parameter

Malfunction Threshold 

Symptom 1, Symptom 2-A, and Symptom 2-B occurs.

Symptom		Vehicle conditions	PCM detection
1		Stopped with forward clutch engaged	Pulley ratio [Pulley Ratio] is more than 0.3, or less than 0.6 for at least 2.5 seconds
2	2-A	Starting	Excessive Input torque
	2-B	Running	Pulley ratio [Pulley Ratio] is less than 3.0

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.

• CVT drive pulley pressure control solenoid valve stuck off

Confirmation Procedure 

Operating Condition 

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

• Start the engine.
• Accelerate the vehicle in D until the speed reaches 37 mph (60 km/h).
• Slow down and stop the vehicle.
• Accelerate the vehicle with wide open throttle.
• Slow down and stop the vehicle, and turn the vehicle to the OFF (LOCK) mode.
• 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 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.