Nissan Altima 2007-2012 Service Manual: Electric ignition system

System Diagram

System Description

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 (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.

Component Parts Location

1. Power valve actuator 1

2. Intake valve timing control solenoid valve (bank 1)

3. Power steering pressure sensor

4. Intake valve timing control solenoid valve (bank 2)

5. VIAS control solenoid valves 1 and 2

6. Fuel injector (bank 2)

7. Ignition coil (with power transistor) and spark plug (bank 2)

8. Crankshaft position sensor (POS)

9. Engine coolant temperature sensor

10. Camshaft position sensor (PHASE) (bank 2)

11. ECM

12. Refrigerant pressure sensor

13. Battery current sensor

14. PNP switch

15. Condenser-2

16. Mass air flow sensor (with intake air temperature sensor)

17. EVAP service port

18. Camshaft position sensor (PHASE) (bank 1)

19. Electric throttle control actuator

20. Power valve actuator 2

21. EVAP canister purge volume control solenoid valve

22. Ignition coil (with power transistor) and spark plug (bank 1)

and spark plug (bank 1) 23. Knock sensor

1. Mas air flow sensor (with intake air temperature sensor)

2. Air cleaner case

3. Engine coolant temperature sensor

4. EVAP canister purge volume control solenoid valve

5. Power valve actuator 1

6. VIAS control solenoid valve 1

7. VIAS control solenoid valve 2

8. Power valve actuator 2

9. Power steering pressure sensor

10. Tie rod (RH)

11. Power valve actuator 2

12. Camshaft position sensor (PHASE) (bank 1)

13. Camshaft position sensor (PHASE) (bank 2)

1. A/F sensor 1 (bank 1)

2. A/F sensor 1 (bank 2)

3. HO2S2 (bank 1) harness connector

4. HO2S2 (bank 2) harness connector (CVT models)

5. Front engine mount

6. HO2S2 (bank 2) harness connector (M/T models)

7. Crankshaft position sensor (POS) (M/T models)

8. Crankshaft position sensor (POS) (CVT models)

1. Electronic controlled engine mount control solenoid valve

2. EVAP control system pressure sensor

3. EVAP canister vent control valve

4. EVAP canister

5. Injector harness connector

6. Intake valve timing control solenoid valve (bank 1)

7. Intake valve timing control solenoid valve (bank 2)

1. Knock sensor (bank 2)

2. Knock sensor (bank 1)

3. PNP switch (CVT models)

4. PNP switch (M/T models)

5. Battery

6. IPDM E/R

7. ECM

8. Refrigerant pressure sensor (shown with front grill removed)

9. Accelerator pedal

1. ASCD brake switch

2. Stop lamp switch

3. Brake pedal

4. ASCD steering switch

5. ASCD clutch switch (M/T models)

6. Clutch pedal

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