Nissan Sentra Service Manual: Electric ignition system
ELECTRIC IGNITION SYSTEM : System Description
SYSTEM DIAGRAM
*1: CVT models
*2: M/T models
Input/output signal chart
| Sensor | Input Signal to ECM | ECM function | Actuator | |
| Crankshaft position sensor (POS) |
|
Ignition timing control | Ignition coil (with 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 | |||
| Transmission range switch*1 | Gear position | |||
| Park/neutral position (PNP) switch*2 | ||||
| Battery | Battery voltage*3 | |||
| Knock sensor | Engine knocking condition | |||
| Combination meter | CAN communication | Vehicle speed signal | ||
*1: CVT models
*2: M/T models
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
Firing order: 1 - 3 - 4 - 2
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) signal.
Computing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in the ECM.
- At starting
- During warm-up
- At idle
- At low battery voltage
- During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
Multiport fuel injection system
MULTIPORT FUEL INJECTION SYSTEM : System
Description
SYSTEM DIAGRAM
*1: ECM determines the start signal status by the signals of engine speed and
battery voltage.
*2: M/T models
*3: CVT mod ...
Intake valve timing control
INTAKE VALVE TIMING CONTROL : System Description
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (P ...
Other materials:
The oil pressure warning lamp does not turn off
Description
The oil pressure warning lamp remains illuminated while the engine is running
(normal oil pressure).
Diagnosis procedure
1.Check combination meter input signal
Start the engine and select METER/M&A on CONSULT.
Observe oil w/l data monitor and the operation of the oil pres ...
Operating range
The Intelligent Key functions can only be used
when the Intelligent Key is within the specified
operating range.
When the Intelligent Key battery is almost discharged
or strong radio waves are present near
the operating location, the Intelligent Key system’s
operating range becomes nar ...
P0122, P0123 TP Sensor
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P0122 or P0123 is displayed with DTC P0643, first perform the
trouble diagnosis for DTC P0643.
Refer to EC-353, "DTC Logic".
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible caus ...
