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 MANUALSINFINITI2008FX45 AWD V8-4.5L (VK45DE)REPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATIONA/T CONTROL SYSTEMSHIFT CONTROL
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)
Shift Control
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)SECTION Shift Control
Shift Control
The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change characteristic is attained.
SHIFT CHANGE
The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque information, etc.
Shift Change System Diagram
BLIPPING CONTROL
This system makes transmission clutch engage readily by controlling (synchronizing) engine revolution according to the (calculation of) engine revolution after shifting down.
^ "BLIPPING CONTROL" functions.
- When downshifting by accelerator pedal depression at "D" position.
- When downshifting under the manual mode.
^ TCM selects "BLIPPING CONTROL" or "NORMAL SHIFT CONTROL" according to the gear position, the select lever position, the engine torque and the speed when accelerating by accelerator pedal depression.
^ Revolution control demand signal is transmitted from TCM to ECM under "BLIPPING CONTROL".
^ TCM synchronizes engine revolution according to the revolution control demand signal.
Shift Change System Diagram
The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change characteristic is attained.
SHIFT CHANGE
The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque information, etc.
Shift Change System Diagram
BLIPPING CONTROL
This system makes transmission clutch engage readily by controlling (synchronizing) engine revolution according to the (calculation of) engine revolution after shifting down.
^ "BLIPPING CONTROL" functions.
- When downshifting by accelerator pedal depression at "D" position.
- When downshifting under the manual mode.
^ TCM selects "BLIPPING CONTROL" or "NORMAL SHIFT CONTROL" according to the gear position, the select lever position, the engine torque and the speed when accelerating by accelerator pedal depression.
^ Revolution control demand signal is transmitted from TCM to ECM under "BLIPPING CONTROL".
^ TCM synchronizes engine revolution according to the revolution control demand signal.
Shift Change System Diagram
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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.