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.
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HOMESERVICE MANUALSINFINITI2002Q45 V8-4.5L (VK45DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORTESTING AND INSPECTION
2002 Infiniti Q45 V8-4.5L (VK45DE)
Throttle Position Sensor: Testing and Inspection
2002 Infiniti Q45 V8-4.5L (VK45DE)SECTION Testing and Inspection
Component Inspection
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform "Throttle Valve Closed Position Learning".
3. Turn ignition switch "ON".
4. Set selector lever to "D" position.
5. Check voltage between ECM terminals 98 (TP sensor 2), 108 (TP sensor 1) and engine ground under the following conditions.
6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform "Throttle Valve Closed Position Learning".
8. Perform "Idle Air Volume Learning".
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform "Throttle Valve Closed Position Learning".
3. Turn ignition switch "ON".
4. Set selector lever to "D" position.
5. Check voltage between ECM terminals 98 (TP sensor 2), 108 (TP sensor 1) and engine ground under the following conditions.
6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform "Throttle Valve Closed Position Learning".
8. Perform "Idle Air Volume Learning".
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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.