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 SYSTEMSINFORMATION BUSTESTING AND INSPECTIONCAN SYSTEM FOR VDC MODELSDIAGNOSTIC STRATEGIESINSPECTION
2002 Infiniti Q45 V8-4.5L (VK45DE)
Inspection
2002 Infiniti Q45 V8-4.5L (VK45DE)SECTION Inspection
Proceed trouble diagnosis according to the check sheet results (example).
Case 1:Replace ECM.
Case 2:Replace VDC/TCS/ABS control unit.
Case 3:Replace TCM.
Case 4:Check Harness between VDC/TCS/ABS control unit and steering wheel angle sensor. Refer to "Circuit Check Between VDC/TCS/ABS Control Unit and Steering Wheel Angle Sensor"
Case 5:Check Harness between steering wheel angle sensor and combination meter. Refer to "Circuit Check Between Steering Wheel Angle Sensor and Combination Meter"
Case 6:Check ECM Circuit. Refer to "ECM Circuit Check"
Case 7:Check VDC/TCS/ABS control unit Circuit. Refer to "VDC/TCS/ABS Control Unit Circuit Check"
Case 8:Check Steering wheel angle sensor Circuit. Refer to "Steering Wheel Angle Sensor Circuit Check".
Case 9:Check Combination meter Circuit. Refer to "Combination Meter Circuit Check"
Case 10:Check TCM Circuit. Refer to "TCM Circuit Check"
Case 11:Check CAN communication Circuit. Refer to "CAN Communication Circuit Check"
Case 1:Replace ECM.
Case 2:Replace VDC/TCS/ABS control unit.
Case 3:Replace TCM.
Case 4:Check Harness between VDC/TCS/ABS control unit and steering wheel angle sensor. Refer to "Circuit Check Between VDC/TCS/ABS Control Unit and Steering Wheel Angle Sensor"
Case 5:Check Harness between steering wheel angle sensor and combination meter. Refer to "Circuit Check Between Steering Wheel Angle Sensor and Combination Meter"
Case 6:Check ECM Circuit. Refer to "ECM Circuit Check"
Case 7:Check VDC/TCS/ABS control unit Circuit. Refer to "VDC/TCS/ABS Control Unit Circuit Check"
Case 8:Check Steering wheel angle sensor Circuit. Refer to "Steering Wheel Angle Sensor Circuit Check".
Case 9:Check Combination meter Circuit. Refer to "Combination Meter Circuit Check"
Case 10:Check TCM Circuit. Refer to "TCM Circuit Check"
Case 11:Check CAN communication Circuit. Refer to "CAN Communication Circuit Check"
RENDER: 1.0x
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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.