2008 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Input/Output Signal Chart

INPUT/OUTPUT SIGNAL CHART

Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Engine speed(2)
Piston position		 Ignition timing control Power transistor
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage(2)
Knock sensor Engine knocking
Park/neutral position (PNP) switch Gear position
Wheel sensor Vehicle speed(1)
(1) This signal is sent to the ECM through CAN communication line.
(2) ECM determines the start signal status by the signals of engine speed and battery voltage.
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.

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