Infiniti G37 Coupe. Manual — part 466
ELECTRIC IGNITION SYSTEM
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[VQ37VHR]
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ELECTRIC IGNITION SYSTEM
System Diagram
INFOID:0000000001733935
System Description
INFOID:0000000001733936
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 - 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 (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
JMBIA0072GB
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed*
2
Piston position
Ignition timing
control
Ignition coil (with power tran-
sistor)
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
Park/neutral position (PNP) switch
Gear position
Battery
Battery voltage*
2
Knock sensor
Engine knocking
Unified meter and A/C amp.
Vehicle speed*
1
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[VQ37VHR]
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:0000000001910703
1.
Battery current sensor
2.
IPDM E/R
3.
VVEL control module
4.
Cooling fan relay
5.
VVEL actuator motor relay
6.
Mass air flow sensor (with intake air
temperature sensor) (bank 1)
7.
Refrigerant pressure sensor
8.
Camshaft position sensor (PHASE)
(bank 1)
9.
Cooling fan motor-2
10. Intake valve timing control solenoid
valve (bank 1)
11.
Cooling fan control module
12. Cooling fan motor-1
13. Intake valve timing control solenoid
valve (bank 2)
14. Camshaft position sensor (PHASE)
(bank 2)
15. Mass air flow sensor (with intake air
temperature sensor) (bank 2)
16. ICC brake hold relay (ICC models)
17. Brake booster pressure sensor
18. Ignition coil (with power transistor)
and spark plug (bank 2)
19. Electric throttle control actuator
(bank 2)
20. A/F sensor 1 (bank 2)
21. Fuel injector (bank 2)
22. VVEL control shaft position sensor
(bank 2)
23. VVEL actuator motor (bank 2)
24. Manifold absolute pressure (MAP)
sensor
25. Engine coolant temperature sensor
26. Knock sensor
27. Fuel injector (bank 1)
28. VVEL actuator motor (bank 1)
29. EVAP canister purge volume control
solenoid valve
30. VVEL control shaft position sensor
(bank 1)
JMBIA0837ZZ
ELECTRIC IGNITION SYSTEM
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31. Ignition coil (with power transistor)
and spark plug (bank 1)
32. EVAP service port
33. A/F sensor 1 (bank 1)
34. Crankshaft position sensor (POS)
35. Electric throttle control actuator
(bank 1)
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)
: Vehicle front
1.
Cooling fan motor-2
2.
Cooling fan control module
3.
Cooling fan motor-1
4.
Cooling fan relay
JMBIA0838ZZ
JMBIA0839ZZ
JMBIA0840ZZ
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ELECTRIC IGNITION SYSTEM
PBIB1907E
: Vehicle front
1.
A/F sensor 1 (bank 1)
2.
A/F sensor 1 (bank 2)
: Vehicle front
1.
A/F sensor 1 (bank 1) harness con-
nector
2.
A/F sensor 1 (bank 2) harness con-
nector
JMBIA0007ZZ
JMBIA0841ZZ
JMBIA0018ZZ
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