DTC Detecting Condition and Trouble Area

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

P0721 SYMPTOM DIAGNOSIS DESCRIPTION CHART

DTC detecting condition	Trouble area
DTC P0721: Output Speed Sensor Circuit Range/Performance This DTC is detected if all of the following conditions are met. Difference between measured engine speed and the estimated secondary pulley speed is more than 1000 RPM for 5 sec. when lock-up ON. Difference between measured primary pulley speed and the estimated secondary pulley speed is more than 1000 RPM for 5 sec. when lock-up ON. (2 D/C detection logic)	Secondary pulley speed sensor and/or its circuit Primary pulley speed sensor and/or its circuit TCM

DTC detecting condition

Trouble area

DTC P0721: Output Speed Sensor Circuit Range/Performance
This DTC is detected if all of the following conditions are met.

Difference between measured engine speed and the estimated secondary pulley speed is more than 1000 RPM for 5 sec. when lock-up ON.
Difference between measured primary pulley speed and the estimated secondary pulley speed is more than 1000 RPM for 5 sec. when lock-up ON.

(2 D/C detection logic)

Secondary pulley speed sensor and/or its circuit
Primary pulley speed sensor and/or its circuit
TCM