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 end cover. 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 transmission control module (TCM). The TCM converts the pulses to drive pulley speed. If no pulses occur with the drive pulley 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 drive pulley speed sensor and the torque converter turbine speed sensor, the TCM detects a malfunction and stores a DTC.

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

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/mode
Without paddle shifter
D, S, L
With paddle shifter
D, S
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 NDR-PWM line open (includes connector loose connection or disconnection)
CVT drive pulley speed sensor VCC line open (includes connector loose connection or disconnection)
CVT drive pulley speed sensor SG line open (includes connector loose connection or disconnection)
CVT drive pulley speed sensor NDR-PWM line short to ground
CVT drive pulley speed sensor failure
TCM 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, 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.