DETECTED CONDITION | POSSIBLE CAUSE |
Signal voltage is out of the specified range. Difference between actual throttle opening and opening calculated by ECM in larger than specified value. 0.1 V ≤ Sensor voltage ≤ 4.8 V | • STP sensor maladjusted. • STP sensor circuit open or short. • STP sensor malfunction. • ECM malfunction. |
Inspection
Step 1
1) Remove the air cleaner box. (5-15)
2) Turn the ignition switch OFF.
3) Check the STP sensor coupler for loose or poor contacts. If OK, then measure the STP sensor input voltage.
![](https://motoinstruction.ru/img/suzuki/14/120295.jpg)
4) Disconnect the STP sensor coupler.
5) Turn the ignition switch ON.
6) Measure the voltage at the Red wire and ground.
7) If OK, then measure the voltage at the Red wire and B/Br wire.
![](https://motoinstruction.ru/img/suzuki/14/120296.jpg)
- STP sensor input voltage: 4.5-5.5 V
- ((+) Red - (-) Ground)
- ((+) Red - (-) B/Br)
- 09900-25008: Multi circuit tester set
- Tester knob indication: Voltage (⎓)
![](https://motoinstruction.ru/img/suzuki/14/120297.jpg)
Is the voltage OK?
YES | Go to Step 2 |
NO | • Loose or poor contacts on the ECM coupler. • Open or short circuit in the Red wire or B/Br wire. |
Step 2
1) Turn the ignition switch OFF.
2) Disconnect the STP sensor coupler.
3) Check the continuity between Yellow wire and ground.
- STP sensor continuity: ∞ Ω (Infinity) (Yellow - Ground)
![](https://motoinstruction.ru/img/suzuki/14/120298.jpg)
4) If OK, then measure the STP sensor resistance at the coupler (between Yellow and Black wires).
![](https://motoinstruction.ru/img/suzuki/14/120299.jpg)
5) Close and open the secondary throttle valve fully by turning the actuator shaft end (1), and measure the STP sensor resistance with both STV positions.
STP sensor resistance:
- Secondary throttle valve is closed: Approx. 0.58 kΩ
- Secondary throttle valve is opened: Approx. 4.38 kΩ
- 09900-25008: Multi circuit tester set
- Tester knob indication: Resistance (Ω)
![](https://motoinstruction.ru/img/suzuki/14/120300.jpg)
Caution! Do not use the tool for turning the STVA shaft to prevent breakdown.
Is the resistance OK?
YES | Go to Step 3 |
NO | • Reset the STP sensor position correctly. (5-29) • Replace the STP sensor with a new one. |
Step 3
1) Turn the ignition switch OFF.
2) Connect the STP sensor coupler.
3) Insert the needle pointed probes to the STP sensor coupler.
4) Disconnect the STVA coupler.
5) Turn the ignition switch ON.
6) Measure the STP sensor output voltage at the coupler (between (+) Yellow and (-) B/Br wires) when the secondary throttle valve is full closed and opened.
![](https://motoinstruction.ru/img/suzuki/14/120301.jpg)
Note: The secondary throttle valve can be turned by rotating the actuator shaft end (1).
STP sensor output voltage:
- Secondary throttle valve is closed: Approx. 0.58 V
- Secondary throttle valve is opened: Approx. 4.40 V
- 09900-25008: Multi circuit tester set
- 09900-25009: Needle pointed probe set
- Tester knob indication: Voltage (⎓)
![](https://motoinstruction.ru/img/suzuki/14/120302.jpg)
Caution! Do not use the tool for turning the STVA shaft to prevent breakdown.
Is the voltage OK?
YES | • Red, Yellow or B/Br wire open or shorted to ground, or poor (10), (44) or (34) connection. • If wire and connection are OK, intermittent trouble or faulty ECM. • Recheck each terminal and wire harness for open circuit and poor connection. |
NO | If check result is not satisfactory, replace STP sensor with a new one. |
![](https://motoinstruction.ru/img/suzuki/14/120303.jpg)