DTC Advanced Diagnostics: P0501
DTC P0501:CVT Speed Sensor Circuit Range/Performance

General Description


The CVT speed sensor is attached to the outside of the torque converter housing. The CVT speed sensor detects the number of revolutions of the secondary driven gear and sends a pulsing signal to the transmission control module (TCM). The TCM converts the pulsing signal into vehicle speed. If no pulses occur with the secondary driven gear rotating, the TCM detects a malfunction that may be caused by an open, an intermittent open, or a short to ground. Based on the correlation between the CVT speed sensor and the CVT drive pulley speed sensor, the TCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
4 seconds or more
DTC Type
One drive cycle, MIL on, Shift position indicator blinks

Enable Conditions
Condition
Minimum
Maximum
Engine speed [Engine Speed]
500 rpm
–
Drive pulley speed [Input Shaft (Drive Pulley) Speed rpm]
200 rpm
–
12 volt battery voltage [Battery Voltage]
10.0 V
–
Shift lever position/mode
Without paddle shifter
D, S, L
With paddle shifter
D, S
Other
Rotation speed [Secondary Shaft Speed 1 (rpm)] measured by CVT speed sensor is 200 rpm or more
No electrical noise in the CVT speed sensor output circuit
Decelerate and fuel cut-off for at least 3 seconds
[ ]:HDS Parameter

Malfunction Threshold
One of these conditions is met:
The rotation speed [Secondary Shaft Speed 1 (rpm)] measured by the CVT speed sensor is less than the rotation speed [Input Shaft (Drive Pulley) Speed rpm] measured by the CVT drive pulley speed sensor by a factor of 0.33 for at least 4 seconds.
The rotation speed [Secondary Shaft Speed 1 (rpm)] measured by the CVT speed sensor is more than the rotation speed [Input Shaft (Drive Pulley) Speed rpm] measured by the CVT drive pulley speed sensor by a factor of 2.85 for at least 4 seconds.

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 speed sensor VEL-PWM line open (includes connector loose connection or disconnection)
CVT speed sensor VEL-PWM line short to ground
CVT speed sensor failure
TCM internal circuit failure

Confirmation Procedure
Operating Condition

1.
Start the engine.
2.
Drive the vehicle at a speed of 37 mph (60 km/h) or more.
3.
Release the accelerator pedal, and slow the vehicle.
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, the MIL comes on, the shift position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.

Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. 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.