Nissan Altima L32. Instruction — part 232
MULTIPORT FUEL INJECTION SYSTEM
EC-49
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Component Description
INFOID:0000000004349150
1.
No.1 ignition coil
2.
Cooling fan motor-1 harness con-
nector
3.
Cooling fan motor-2 harness con-
nector
4.
Refrigerant pressure sensor
5.
Accelerator pedal position sensor
6.
ASCD brake switch
7.
Stop lamp switch
8.
Brake pedal
9.
ASCD clutch switch
10. Clutch pedal
11. ASCD steering switch
12. CANSEC switch
13. RESUME/ACCELERATE switch
14. SET/COAST switch
15. MAIN switch
: Vehicle front
ALBIA0089ZZ
Component
Reference
A/F sensor 1
Accelerator pedal position sensor
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)
EC-50
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[QR25DE FOR CALIFORNIA]
MULTIPORT FUEL INJECTION SYSTEM
Engine coolant temperature sensor
Fuel injector
Heated oxygen sensor 2
Intake air temperature sensor
Knock sensor
Mass air flow sensor
Park/neutral position switch
Power steering pressure sensor
Throttle position sensor
Vehicle speed sensor
Component
Reference
ELECTRIC IGNITION SYSTEM
EC-51
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ELECTRIC IGNITION SYSTEM
System Diagram
INFOID:0000000004349151
System Description
INFOID:0000000004349152
INPUT/OUTPUT SIGNAL CHART
*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.
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) sig-
nal. 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
JMBIA0174GB
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed*
2
Piston position
Ignition timing
control
Ignition coil (with power transis-
tor)
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
Combination meter
Vehicle speed*
1
EC-52
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[QR25DE FOR CALIFORNIA]
ELECTRIC IGNITION SYSTEM
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.
Component Parts Location
INFOID:0000000004349153
1.
Intake valve timing control solenoid
valve
2.
Ignition coil (with power transistor)
and spark plug
3.
Knock sensor,
Crankshaft position sensor (POS)
4.
Air fuel ratio (A/F) sensor 1
5.
Camshaft position sensor (PHASE)
6.
Engine coolant temperature sensor
7.
Park/neutral position (PNP) switch
8.
ECM
9.
Refrigerant pressure sensor
10. Battery current sensor
11. IPDM E/R
12. Mass air flow sensor (with intake
temperature sensor)
13. Tumble control valve actuator
14. EVAP service port
15. Electric throttle control actuator
(with built in throttle position sensor
and throttle control motor)
16. EVAP canister purge volume control
solenoid valve
17. Fuel injector
18. Power steering pressure sensor
ALBIA0046ZZ
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