Symptom Condition Diagnostic ItemReference Page
Except for
Euro-OBDEURO-OBD
Transmission overheats.ON vehicle1. Fluid level AT-78¬
2. Engine idling rpmEC-41, ªIdle
Speed and
Ignition Tim-
ingºEC-41, ªIdle
Speed and
Ignition Tim-
ingº
3. Throttle position sensor (Adjustment)EC-168,
ªDTC P0120
THROTTLE
POSITION
SENSORºEC-168,
ªDTC P0120
THROTTLE
POSITION
SENSORº
4. Line pressure test AT-82¬
5. Line pressure solenoid valve AT-174 AT-237
6. Control valve assembly AT-343¬
OFF vehicle7. Oil pump AT-371¬
8. Reverse clutch AT-390¬
9. High clutch AT-394¬
10. Brake band AT-419¬
11. Forward clutch AT-399¬
12. Overrun clutch AT-399¬
13. Low & reverse brake AT-406¬
14. Torque converter AT-354¬
ATF shoots out during operation.
White smoke emitted from exhaust
pipe during operation.ON vehicle 1. Fluid level AT-78¬
OFF vehicle2. Reverse clutch AT-390¬
3. High clutch AT-394¬
4. Brake band AT-419¬
5. Forward clutch AT-399¬
6. Overrun clutch AT-399¬
7. Low & reverse brake AT-406¬
Offensive smell at fluid charging
pipe.ON vehicle 1. Fluid level AT-78¬
OFF vehicle2. Torque converter AT-354¬
3. Oil pump AT-371¬
4. Reverse clutch AT-390¬
5. High clutch AT-394¬
6. Brake band AT-419¬
7. Forward clutch AT-399¬
8. Overrun clutch AT-399¬
9. Low & reverse brake AT-406¬
TROUBLE DIAGNOSIS Ð GENERAL DESCRIPTION
Symptom Chart (Cont'd)
AT-114
Both High- and Low-pressure Sides are Too High.NJHA0151S01
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high and low-pressure sides
are too high.
AC359A
+Pressure is reduced soon
after water is splashed on
condenser.Excessive refrigerant charge
in refrigeration cycleReduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance
¯
1. Condenser fins are
clogged.
2. Improper fan rotation of
cooling fan+Clean condenser.
+Check and repair cooling
fan as necessary.
+Low-pressure pipe is not
cold.
+When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa
(2.0 bar, 2 kg/cm
2, 28 psi).
It then decreases gradually
thereafter.Poor heat exchange in con-
denser
(After compressor operation
stops, high pressure
decreases too slowly.)
¯
Air in refrigeration cycleEvacuate repeatedly and
recharge system.
Engine tends to overheat. Engine cooling systems mal-
function.Check and repair each
engine cooling system.
+An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
+Plates are sometimes cov-
ered with frost.+Excessive liquid refrigerant
on low-pressure side
+Excessive refrigerant dis-
charge flow
+Expansion valve is open a
little compared with the
specification.
¯
1. Improper thermal valve
installation
2. Improper expansion valve
adjustmentReplace expansion valve.
High-pressure Side is Too High and Low-pressure Side is Too Low.NJHA0151S02
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
AC360A
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.High-pressure tube or parts
located between compressor
and condenser are clogged
or crushed.+Check and repair or
replace malfunctioning
parts.
+Check lubricant for con-
tamination.
TROUBLE DIAGNOSES
Insufficient Cooling (Cont'd)
HA-79
