TROUBLE DIAGNOSES FOR UNUSUAL PRESSURENJHA0151Whenever system’s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan-
dard (usual) pressure, however, differs from vehicle to vehicle, refer toHA-70 (“Ambient air temperature-to-
operating pressure table”).
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 fanClean 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 expansion valve
installation
2. Improper expansion valve
adjustmentReplace expansion valve.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-71
HOW TO CHANGE SELF-DIAGNOSIS MODE WITH CONSULT-II=NJRS0043S03From User Mode to Diagnosis ModeNJRS0043S0301After selecting “AIR BAG” on the “SELECT SYSTEM” screen, User mode automatically changes to Diagno-
sis mode.
SRS803
From Diagnosis Mode to User ModeNJRS0043S0302To return to User mode from Diagnosis mode, touch “BACK” key of CONSULT-II until “SELECT SYSTEM”
appears, Diagnosis mode automatically changes to User mode.
SRS804
HOW TO CHANGE SELF-DIAGNOSIS MODE WITHOUT CONSULT-IINJRS0043S04From User Mode to Diagnosis ModeNJRS0043S0401When a malfunction is detected, activate the Diagnosis mode by turning theignition switch as follows:
1) Turn ignition switch “ON”.
2) After “AIR BAG” warning lamp lights for 7 seconds, turn ignition switch “OFF” within 1 second.
3) Wait more than 3 seconds.
4) Repeat steps 1 to 3 three times.
5) Turn ignition switch “ON”.
SRS will not enter Diagnosis mode if no malfunction is detected.
From Diagnosis Mode to User ModeNJRS0043S0402After a malfunction is repaired, switch the ignition “OFF” for at least onesecond, then back “ON”. Diagnosis
mode is returned to User mode.
When a malfunction is detected, switch from Diagnosis mode to User mode by turning the ignition switch as
follows:
1) Turn ignition switch “ON”.
2) After “AIR BAG” warning lamp lights for 7 seconds, turn ignition switch “OFF” within 1 second.
3) Wait more than 3 seconds.
4) Repeat steps 1 to 3 three times.
5) Turn ignition switch “ON”.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses Introduction (Cont’d)
RS-42
