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Home >> Infiniti >> 2010 >> M45 x >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0460 To P1421 >> DTC P1217 Engine Over Temperature >> Main 13 Causes of Overheating
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Main 13 Causes of Overheating

INSPECTION ITEM 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
"ANTI-FREEZE COOLANT MIXTURE RATIO "
3
  • Coolant level
  • Visual
Coolant up to MAX level in reservoir tank and radiator filler neck "INSPECTION "
4
  • Radiator cap
  • Pressure tester
"CHECKING RADIATOR CAP "
ON(2) 5
  • Coolant leakage
  • Visual
No leakage "INSPECTION "
ON(2) 6
  • Thermostat
  • Touch the upper and lower radiator hoses
Both hoses should be hot "REMOVAL AND INSTALLATION "
ON(1) 7
  • Cooling fan
  • CONSULT-III
Operating See trouble diagnosis for DTC P1217 ( DTC P1217 ENGINE OVER TEMPERATURE ).
OFF 8
  • Combustion gas leakage
  • 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 "CHANGING ENGINE COOLANT "
OFF(4) 10
  • Coolant return from reservoir tank to radiator
  • Visual
Should be initial level in reservoir tank "CHANGING ENGINE COOLANT "
OFF 11
  • Water control valve
  • Remove and inspect the valve
Within the specified value "REMOVAL AND INSTALLATION "
OFF 12
  • Cylinder head
  • Straight gauge feeler gauge
0.1 mm (0.004 in) Maximum distortion (warping) "INSPECTION AFTER DISASSEMBLY "
13
  • Cylinder block and pistons
  • Visual
No scuffing on cylinder walls or piston "DISASSEMBLY AND ASSEMBLY "
(1) Turn the ignition switch ON.
(2) Engine running at 3, 000 RPM for 10 minutes.
(3) Drive at 90 km/h (56 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 ".