LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 999 (Heater & Air Conditioning Control System) >> With Monochrome Display >> Symptom Diagnosis >> Insufficient Heating >> Component Function Check >> Inspection Flow

Inspection Flow

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
    1. Press the AUTO switch.
    2. Turn temperature control switch (driver side) clockwise until 32°C (90°F) is displayed.
    3. Check for hot air at discharge air outlets.

    Can a symptom be duplicated? 

    YES: GO TO  3

    NO: GO TO 2

  2. CHECK FOR ANY SYMPTOMS

    Perform a complete operational check and check for any symptoms. Refer to "OPERATIONAL CHECK ".

    Does another symptom exist? 

    YES: Refer to "WITH MONOCHROME DISPLAY: SYMPTOM MATRIX CHART ".

    NO: System OK.

  3. CHECK FOR SERVICE BULLETINS

    Check for any service bulletins.

    GO TO 4

  4. CHECK ENGINE COOLING SYSTEM
    1. Check for proper engine coolant level. Refer to "SYSTEM INSPECTION ".
    2. Check hoses for leaks or kinks.
    3. Check radiator cap. Refer to "SYSTEM INSPECTION ".
    4. Check for air in cooling system.

    GO TO 5

  5. CHECK SETTING OF TEMPERATURE SETTING TRIMMER

    Using CONSULT-III, check the setting of "TEMP SET CORRECT" on "WORK SUPPORT" of HVAC. Refer to "TEMPERATURE SETTING TRIMMER ".

    1. Check that the temperature setting trimmer is set to "- direction".
      NOTE: The control temperature can be set by the temperature setting trimmer.
    2. Set temperature control dial to "0".

    Is the symptom still present? 

    YES: GO TO 6.

    NO: Inspection End.

  6. CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
    1. Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of HVAC.
    2. Check if any DTC No. is displayed in the trouble diagnosis results.
    NOTE: If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to "DTC LOGIC - U1000 CAN COMM CIRCUIT " or "DTC LOGIC - U1010 CONTROL UNIT (CAN) ".

    Is any DTC No. displayed? 

    YES: Perform diagnosis for the applicable DTC. Refer to "DTC INDEX ".

    NO: GO TO 7.

  7. CHECK WITH ACTIVE TEST OF CONSULT-III
    1. Using CONSULT-III, perform "HVAC TEST" in "ACTIVE TEST" of HVAC to check each output device. Refer to "CONSULT-III FUNCTION ".
      NOTE: Perform the ACTIVE TEST after starting the engine because the A/C compressor is operating.
    2. Refer to the table and check the outlet, inlet, airflow temperature, blower motor control signal, magnet clutch operation, and air mix ratio. Visually check each operating condition, by listening for noise, touching air outlets with a hand, etc.
    TEST ITEM CHART

      Test item
    MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6
    Mode door position VENT1 B/L1 B/L2 FOOT D/F DEF
    Intake door position REC REC 20%FRE FRE FRE FRE
    Air mix door position (driver & passenger side) FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
    Blower motor duty ratio 37% 91% 65% 65% 65% 91%
    A/C Compressor (Magnet clutch) ON ON ON OFF ON ON

    Does it operate normally? 

    YES: GO TO 8.

    NO-1: Air outlet does not change. Refer to "DIAGNOSIS PROCEDURE ".

    NO-2: Air inlet does not change. Refer to "DIAGNOSIS PROCEDURE ".

    NO-3: Discharge air temperature does not change. Refer to "DIAGNOSIS PROCEDURE - B2632, B2633 AIR MIX DOOR MOTOR (DRIVER SIDE) " and "DIAGNOSIS PROCEDURE - B2634, B2635 AIR MIX DOOR MOTOR (PASSENGER SIDE) ".

    NO-4: Blower motor does not operate normally. Refer to "DIAGNOSIS PROCEDURE ".

    NO-5: Magnet clutch does not operate. Refer to "DIAGNOSIS PROCEDURE ".

  8. CHECK AIR DUCTS

    Check for disconnected or leaking air ducts.

    Is the inspection result normal? 

    YES: GO TO 9

    NO: Repair all disconnected or leaking air ducts.

  9. CHECK HEATER HOSE TEMPERATURES
    1. Start engine and warm it up to normal operating temperature.
    2. Touch both the inlet and outlet heater hoses.

    Is the inspection result normal? 

    YES: Hot inlet hose and a warm outlet hose: GO TO 10

    NO: Both hoses warm: GO TO  11

  10. CHECK ENGINE COOLANT SYSTEM

    Check thermostat operation. Refer to "REMOVAL AND INSTALLATION ".

    Is the inspection result normal? 

    YES: System OK.

    NO: Repair or replace as necessary.

  11. CHECK HEATER HOSES

    Check heater hoses for proper installation.

    Is the inspection result normal? 

    YES: System OK.

    NO:

    1. Back flush heater core.
    2. Drain the water from the system.
    3. Refill system with new engine coolant. Refer to "CHANGING ENGINE COOLANT ".
    4. To retest GO TO 12
  12. CHECK HEATER HOSE TEMPERATURES
    1. Start engine and warm up to normal operating temperature.
    2. Touch both the inlet and outlet heater hoses.

    Is the inspection result normal? 

    YES: System OK.

    NO: Replace heater core. Refer to "HEATER CORE: REMOVAL AND INSTALLATION ".

scientia non olet · About LEMON Manuals