Nissan Altima 2007-2012 Service Manual: Cooling fan control

System Diagram

System Description

INPUT/OUTPUT SIGNAL CHART

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to ECM via the CAN communication line.

SYSTEM DESCRIPTION

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays in the IPDM E/R via the CAN communication line.

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)

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

Component Description

    Can communication
    System Description CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and ...

    Electronic controlled engine mount
    System Diagram System Description INPUT/OUTPUT SIGNAL CHART *: This signal is sent to the ECM via the CAN communication line. SYSTEM DESCRIPTION The ECM controls the engine mount operation c ...

    Other materials:

    Auto operation does not operate but manual operates normally (passenger side)
    Diagnosis Procedure 1. PERFORM INITIALIZATION PROCEDURE Perform initialization procedure. Refer to PWC-295, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement". Is the inspection result normal? YES >> GO TO 2 NO >> Repair or replace the mal ...

    Heated seats (if so equipped)
    The front seats are warmed by built-in heaters. 1. Start the engine. 2. Push the LO or HI position of the switch, as desired. The indicator light in the switch will illuminate. The heater is controlled by a thermostat, automatically turning the heater on and off. The indicator light w ...

    Basic inspection
    Special Repair Requirement 1.INSPECTION START 1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance. 2. Open engine hood and check the following: - Harness connectors for improper connections - Wiring harness fo ...