Nissan Maxima Service and Repair Manual: Cooling fan control

System Diagram

Nissan Maxima. System Diagram

System Description

INPUT/OUTPUT SIGNAL CHART

Nissan Maxima. 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

Nissan Maxima. Cooling Fan Operation

Cooling Fan Relay Operation

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

Nissan Maxima. Cooling Fan Relay Operation

Component Parts Location

Nissan Maxima. Component Parts Location

  1. Intake valve timing control solenoid valve (bank 1)
  2. Electronic controlled engine mount control solenoid valve
  3. Exhaust valve timing control magnet retarder (bank 2)
  4. Intake valve timing control solenoid valve (bank 2)
  5. Knock sensor (bank 1 and 2)
  6. Fuel injector (bank 2)
  7. Ignition coil (with power transistor) and spark plug (bank 2)
  8. Exhaust valve timing control position sensor (bank 2)
  9. Crankshaft position sensor (POS)
  10. Engine coolant temperature sensor
  11. Camshaft position sensor (PHASE) (bank 2)
  12. Transmission range switch
  13. Refrigerant pressure sensor
  14. ECM
  15. Battery current sensor
  16. Condenser-2
  17. EVAP canister purge volume control solenoid valve
  18. Mass air flow sensor (with intake air temperature sensor)
  19. Camshaft position sensor (PHASE) (bank 1)
  20. EVAP service port
  21. Power valve actuator 2
  22. Electric throttle control actuator
  23. Exhaust valve timing control position sensor (bank 1)
  24. Ignition coil (with power transistor) and spark plug (bank 1)
  25. Fuel injector (bank 1)
  26. VIAS control solenoid valve 1 and 2
  27. Power valve actuator 1
  28. Exhaust valve timing control magnet retarder (bank 1)
  29. Power steering pressure sensor

Nissan Maxima. Component Parts Location

  1. Mas air flow sensor (with intake air temperature sensor)
  2. Air cleaner case
  3. Engine coolant temperature sensor (view with engine cover removed)
  4. EVAP canister purge volume control solenoid valve (view with engine cover removed)
  5. Power valve actuator 1 (view with engine cover removed)
  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. Camshaft position sensor (PHASE) (bank 1) (view with air cleaner case removed)
  12. Exhaust valve timing control position sensor (bank 1)
  13. Camshaft position sensor (PHASE) (bank 2) (view with air cleaner case removed)
  14. Exhaust valve timing control position sensor (bank 2)
  15. Engine oil temperature sensor
    : Vehicle front

Nissan Maxima. Component Parts Location

  1. A/F sensor 1 (bank 1) (view with engine removed)
  2. A/F sensor 1 (bank 2)
  3. HO2S2 (bank 1) harness connector (view with engine removed)
  4. HO2S2 (bank 2) harness connector
  5. Front engine mount
  6. Crankshaft position sensor (POS)
    : Vehicle front

Nissan Maxima. Component Parts Location

  1. Electronic controlled engine mount control solenoid valve (view with engine cover removed)
  2. EVAP control system pressure sensor (view with rear suspension member removed)
  3. EVAP canister vent control valve
  4. EVAP canister
  5. Fuel injector harness connector (view with intake manifold collector removed)
  6. Exhaust valve timing control magnet retarder (bank 1) (view with engine removed)
  7. Intake valve timing control solenoid valve (bank 1)
  8. Intake valve timing control solenoid valve (bank 2)
  9. Exhaust valve timing control magnet retarder (bank 2)
    : Vehicle front

Nissan Maxima. Component Parts Location

  1. Knock sensor (bank 2) (view with intake manifold removed)
  2. Knock sensor (bank 1)
  3. Transmission range switch (view with CVT removed)
  4. Battery
  5. IPDM E/R
  6. ECM
  7. Refrigerant pressure sensor (view with front grille removed)
  8. Accelerator pedal position sensor
    : Vehicle front

Nissan Maxima. Component Parts Location

  1. Stop lamp switch
  2. ASCD brake switch
  3. ASCD steering switch

Component Description

Component Reference

  • Camshaft position sensor (PHASE) EC-300, "Description"
  • Crankshaft position sensor (POS) EC-296, "Description"
  • Cooling fan motor EC-486, "Description"
  • Engine coolant temperature sensor EC-201, "Description"
  • Refrigerant pressure sensor
    Can communication

    Electronic controlled engine mount