Advanced Diagnostics

DTC P0502: Problem in CVT Speed Sensor Circuit




General Description
The CVT speed sensor is attached to the outside of the transmission housing. The CVT speed sensor detects the number of revolutions of the secondary gear and sends a pulsing signal to the powertrain control module (PCM). The PCM converts the pulsing signal into vehicle speed. If no pulses occur with the secondary gear rotating, the PCM detects a malfunction that may be caused by an open, a temporary open, or a short to ground. Based on the correlation between the vehicle speed measured by the CVT speed sensor and the CVT output shaft (driven pulley) speed sensor, a malfunction is detected and a DTC is stored.




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




Enable Conditions

Malfunction Threshold
The engine speed measured by the CVT output shaft (driven pulley) speed sensor is 100 rpm or less for at least 4 seconds when the vehicle speed measured by the CVT speed sensor is 9 mph (14 km/h) or more.

Driving Pattern
1. Start the engine. Drive the vehicle at a speed of 25 mph (40 km/h) or more.
2. Release the accelerator, and slow down the vehicle for more than 6 seconds.

- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the PCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.