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Main 12 Causes of Overheating
NFEC1327
Engine Step Inspection item Equipment Standard Reference page
OFF 1 I Blocked radiator
I Blocked condenser
I Blocked radiator grille
I Blocked bumper
I Visual No blocking —
2 I Coolant mixture I Coolant tester 50 - 50% coolant mixture See MA-11, “RECOM-
MENDED FLUIDS AND
LUBRICANTS”.
3 I Coolant level I Visual Coolant up to MAX level
in reservoir tank and
radiator filler neck
See MA-14, “Changing
Engine Coolant”.
4 I Radiator cap I Pressure tester 59 - 98 kPa
(0.6 - 1.0 kg/cm
2
,9-14
psi) (Limit)
See LC-12, “System
Check”.
ON*
2
5 I Coolant leaks I Visual No leaks See LC-12, “System
Check”.
ON*
2
6 I Thermostat I Touch the upper and
lower radiator hoses
Both hoses should be
hot
See LC-18, “Thermostat”
and LC-20, “Radiator”.
ON*
1
7 I Cooling fan I CONSULT-II Operating See trouble diagnosis for
DTC P1217 (EC-532).
OFF 8 I Combustion gas leak I Color checker chemi-
cal tester 4 Gas ana-
lyzer
Negative —
ON*
3
9 I Coolant temperature
gauge
I Visual Gauge less than 3/4
when driving
—
I Coolant overflow to
reservoir tank
I Visual No overflow during driv-
ing and idling
See MA-14, “Changing
Engine Coolant”.
OFF*
4
10 I Coolant return from
reservoir tank to radia-
tor
I Visual Should be initial level in
reservoir tank
See MA-13, “ENGINE
MAINTENANCE”.
OFF 11 I Cylinder head I Straight gauge feeler
gauge
0.1 mm (0.004 in) Maxi-
mum distortion (warping)
See EM-42, “Inspection”.
12 I Cylinder block and pis-
tons
I Visual No scuffing on cylinder
walls or piston
See EM-64, “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 LC-25, “OVERHEATING CAUSE ANALYSIS”.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1217 ENGINE OVER TEMPERATURE
Main 12 Causes of Overheating
EC-549
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