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Home >> Infiniti >> 2008 >> G35 x >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0850 Through P2A03 >> DTC P1217: Engine Over Temperature >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK COOLING FAN OPERATION

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode with CONSULT-III.
    3. Make sure that cooling fan speed varies according to the percent.

    Without CONSULT-III 

    1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to "DIAGNOSIS DESCRIPTION ".
    2. Make sure that cooling fan operates.

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Go to "DIAGNOSIS PROCEDURE ".

  2. CHECK COOLING SYSTEM FOR LEAK-I

    Check cooling system for leak. Refer to "INSPECTION ".

    Is leakage detected? 

    YES: GO TO 3.

    NO: GO TO  4.

  3. CHECK COOLING SYSTEM FOR LEAK-II

    Check the following for leak.

    • Hose
    • Radiator
    • Water pump

      Repair or replace malfunctioning part.

  4. CHECK RADIATOR CAP

    Check radiator cap. Refer to "RADIATOR CAP : INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace radiator cap.

  5. CHECK THERMOSTAT

    Check thermostat. Refer to "INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace thermostat

  6. CHECK ENGINE COOLANT TEMPERATURE SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Replace engine coolant temperature sensor.

  7. CHECK MAIN 12 CAUSES

    If the cause cannot be isolated, check the following.

    MAIN CAUSES AND REFERENCE CHART

    Engine Step Inspection item Equipment Standard Reference
    OFF 1
    • Blocked radiator
    • Blocked condenser
    • Blocked radiator grille
    • Blocked bumper
    • Visual
    		 No blocking -
    2
    • Coolant mixture
    • Coolant tester
    		 50 - 50% coolant mixture  
    3
    • Coolant level
    • Visual
    		 Coolant up to MAX level in reservoir tank and radiator filler neck "INSPECTION "
    4
    • Radiator cap
    • Pressure tester
    		 59 - 98 kPa (0.6 - 1.0 kg/cm2 , 9 - 14 psi) (Limit) "RADIATOR CAP : INSPECTION "
    ON(2) 5
    • Coolant leaks
    • Visual
    		 No leaks "INSPECTION "
    ON(2) 6
    • Thermostat
    • Touch the upper and lower radiator hoses
    		 Both hoses should be hot "INSPECTION "
    ON(1) 7
    • Cooling fan
    • CONSULT-III
    		 Operating "COMPONENT FUNCTION CHECK "
    OFF 8
    • Combustion gas leak
    • Color checker chemical tester 4 Gas analyzer
    		 Negative -
    ON(3) 9
    • Coolant temperature gauge
    • Visual
    		 Gauge less than 3/4 when driving -
    • Coolant overflow to reservoir tank
    • Visual
    		 No overflow during driving and idling "INSPECTION "
    OFF(4) 10
    • Coolant return from reservoir tank to radiator
    • Visual
    		 Should be initial level in reservoir tank "INSPECTION "
    OFF 11
    • Cylinder head
    • Straight gauge feeler gauge
    		 0.1 mm (0.004 in) Maximum distortion (warping) "INSPECTION "
    12
    • Cylinder block and pistons
    • Visual
    		 No scuffing on cylinder walls or piston "INSPECTION "
    (1) Turn the ignition switch ON.
    (2) Engine running at 3, 000 rpm for 10 minutes.
    (3) Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.
    (4) After 60 minutes of cool down time.

    For more information, refer to "TROUBLESHOOTING CHART ".

    INSPECTION END

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