DTC Advanced Diagnostics: P0793
DTC P0793:Intermediate Shaft Speed Sensor "A" Circuit No Signal

General Description


The CVT drive pulley speed sensor is attached to the outside of the transmission housing. The CVT drive pulley speed sensor detects the number of revolutions of the gear on the drive pulley and sends a pulsing signal to the powertrain control module (PCM). The PCM converts the pulses to drive pulley speed. If no pulses occur with the drive pulley rotating, the PCM 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 drive pulley speed sensor and the torque converter turbine speed sensor, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
10 seconds or more
DTC Type
One drive cycle, 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]
550 rpm
–
Torque converter turbine speed [Torque Converter Turbine Speed]
350 rpm
–
12 volt battery voltage [Battery Voltage]
10.0 V
–
Shift lever position
Without paddle shifter
D, S, L
With paddle shifter
D, S
No active DTCs set (prevents monitor from running)
P0501, P0502, P0716, P0717, P0792
Other
Not when the shift lever is being shifted
Rotation speed [Secondary Shaft Speed 1 (rpm)] measured by CVT speed sensor is 350 rpm or more
No electrical noise in the CVT drive pulley speed sensor output circuit
[ ]:HDS Parameter

Malfunction Threshold
The rotation speed [Input Shaft (Drive Pulley) Speed rpm] measured by the CVT drive pulley speed sensor is 60 rpm or less for at least 10 seconds when the rotation speed [Torque Converter Turbine Speed] measured by the torque converter turbine speed sensor is 350 rpm or more.

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 speed sensor line open (includes connector loose connection or disconnection)
CVT drive pulley speed sensor line short to ground
CVT drive pulley speed sensor failure
PCM internal circuit failure

Confirmation Procedure
Operating Condition
1.
Start the engine.
2.
Drive the vehicle at a speed of 19 mph (30 km/h) or more for at least 30 seconds.
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 and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

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.