Infiniti FX35, FX50 (S51). Manual — part 627
MULTIPORT FUEL INJECTION SYSTEM
EC-49
< SYSTEM DESCRIPTION >
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Knock sensor
Mass air flow sensor
Power steering pressure sensor
Throttle position sensor
Component
Reference
EC-50
< SYSTEM DESCRIPTION >
[VQ35HR]
ELECTRIC IGNITION SYSTEM
ELECTRIC IGNITION SYSTEM
System Diagram
INFOID:0000000005236702
System Description
INFOID:0000000005236703
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM via the CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
Ignition order: 1 - 2 - 3 - 4 - 5 - 6
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 signal. Comput-
ing 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
JMBIA1527GB
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor
Engine speed*
2
& Piston position
Ignition timing
control
Ignition coil (with power tran-
sistor)
Camshaft position sensor
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
TCM
Gear position
Battery
Battery voltage*
2
Knock sensor
Engine knocking
Unified meter and A/C amp.
Vehicle speed*
1
ELECTRIC IGNITION SYSTEM
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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:0000000005568461
1.
IPDM E/R
2.
Battery current sensor
3.
Cooling fan relay
4.
Mass air flow sensor (with intake air
temperature sensor) (bank 1)
5.
Refrigerant pressure sensor
6.
Cooling fan motor-2
7.
Intake valve timing control solenoid
valve
8.
Exhaust valve timing control magnet
retarder
9.
Cooling fan control module
10. Cooling fan motor-1
11.
Mass air flow sensor (with intake air
temperature sensor) (bank 2)
12. ICC brake hold relay (ICC models)
13. Ignition coil (with power transistor)
and spark plug (bank 2)
14. Electric throttle control actuator
(bank 2)
15. A/F sensor 1 (bank 2)
16. Fuel injector (bank 2)
17. Camshaft position sensor
18. Engine coolant temperature sensor
19. Knock sensor
20. Exhaust valve timing control position
sensor
21. EVAP canister purge volume control
solenoid valve
22. Fuel injector (bank 1)
23. Ignition coil (with power transistor)
and spark plug (bank 1)
24. EVAP service port
25. A/F sensor 1 (bank 1)
26. Crankshaft position sensor
27. Electric throttle control actuator
(bank 1)
JMBIA1496ZZ
EC-52
< SYSTEM DESCRIPTION >
[VQ35HR]
ELECTRIC IGNITION SYSTEM
1.
Mass air flow sensor (with intake air
temperature sensor) (bank 1)
2.
Mass air flow sensor (with intake air
temperature sensor) (bank 2)
1.
Electric throttle control actuator
(bank 1)
2.
Electric throttle control actuator
(bank 2)
1.
Cooling fan control module
2.
Cooling fan motor-1
3.
Cooling fan motor-2
4.
Cooling fan relay
JMBIA1497ZZ
JMBIA0004ZZ
JMBIA1498ZZ
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