Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Suzuki Aerio L4-2.3LFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Testing and Inspection
Throttle Position (TP) Sensor On-Vehicle Inspection
Using SUZUKI Scan Tool
1. Connect SUZUKI scan tool to DLC (1) with ignition switch OFF.
2. Check "TP Sensor Volt" value displayed on scan tool under the following each condition. If measured value is out of specified range, check TP sensor. If OK, check wire harness of TP sensor.
Also check that "TP Sensor Volt" value varies according to throttle valve opening linearly. If not, it is possible that TP sensor has failed. Replace.
Special Tool
(A): SUZUKI scan tool
TP sensor voltage
When throttle is fully close: 0.70 ± 0.15 V
When throttle is fully open: 4.0 ± 0.5 V
Not Using SUZUKI Scan Tool
1. Remove ECM.
2. Connect couplers to ECM.
3. Using voltmeter, check voltage at "C46-22" terminal under the following each condition. If measured value is out of specified range, check TP sensor.
If OK, check wire harness of TP sensor.
Also check that voltage varies according to throttle valve opening linearly. If not, it is possible that TP sensor has failed. Replace.
TP sensor voltage
When throttle is fully close: 0.70 ± 0.15 V
When throttle is fully open: 4.0 ± 0.5 V
4. Upon completion of checking, install ECM.
Using SUZUKI Scan Tool
1. Connect SUZUKI scan tool to DLC (1) with ignition switch OFF.
2. Check "TP Sensor Volt" value displayed on scan tool under the following each condition. If measured value is out of specified range, check TP sensor. If OK, check wire harness of TP sensor.
Also check that "TP Sensor Volt" value varies according to throttle valve opening linearly. If not, it is possible that TP sensor has failed. Replace.
Special Tool
(A): SUZUKI scan tool
TP sensor voltage
When throttle is fully close: 0.70 ± 0.15 V
When throttle is fully open: 4.0 ± 0.5 V
Not Using SUZUKI Scan Tool
1. Remove ECM.
2. Connect couplers to ECM.
3. Using voltmeter, check voltage at "C46-22" terminal under the following each condition. If measured value is out of specified range, check TP sensor.
If OK, check wire harness of TP sensor.
Also check that voltage varies according to throttle valve opening linearly. If not, it is possible that TP sensor has failed. Replace.
TP sensor voltage
When throttle is fully close: 0.70 ± 0.15 V
When throttle is fully open: 4.0 ± 0.5 V
4. Upon completion of checking, install ECM.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.