2007 NISSAN TIIDA Evaporator

INSUFFICIENT COOLING
HAC-79
< SYMPTOM DIAGNOSIS >[MANUAL AIR CONDITIONER]
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HAC
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P Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure
sides are too low. There is a big temperature dif-
ference between liquid tank
outlet and inlet. Outlet tem-
perature is extremely low.
 Liquid tank inlet and expan-
sion valve are frosted.Liquid tank inside is slightly
clogged. Replace liquid tank.
 Check oil for contamination.
 Temperature of expansion
valve inlet is extremely low as
compared with areas near liq-
uid tank.
 Expansion valve inlet may be
frosted.
 Temperature difference oc-
curs somewhere in high-pres-
sure side.High-pressure pipe located be-
tween liquid tank and expansion
valve is clogged. Check and repair malfunc-
tioning parts.
 Check oil for contamination.
Expansion valve and liquid tank
are warm or only cool when
touched.Low refrigerant charge.
↓
Leaking fittings or componentsCheck refrigerant for leaks.
Refer to XXXX CHECKING OF
REFRIG LEAKS .
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.Expansion valve closes a little
compared with the specification.
↓
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion
valve.
3. Outlet and inlet may be
clogged. Remove foreign particles by
using compressed air.
 Replace expansion valve.
 Check oil for contamination.
An area of the low-pressure pipe
is colder than areas near the
evaporator outlet.Low-pressure pipe is clogged or
crushed. Check and repair malfunc-
tioning parts.
 Check oil for contamination.
Air flow volume is not enough or
is too low.Evaporator is frozen. Check thermo control amp.
Refer to XXXX MAG
CLUTCH CIR..
 Replace compressor.
 Repair evaporator fins.
 Replace evaporator.
 Refer to XXXX BLOWER
MOTOR CIR. .
AC353A
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes be-
comes negative. Air conditioning system does
not function and does not cy-
clically cool the compart-
ment air.
 The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant. Drain water from refrigerant
or replace refrigerant.
 Replace liquid tank.
AC354A

INTAKE SENSOR
HAC-139
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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INTAKE SENSOR
Component InspectionINFOID:0000000001572418
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor (1) is located on the A/C unit. It converts tempera-
ture of air after it passes through the evaporator (2) into a resistance
value which is then input to the front air control.
Intake Sensor Diagnosis ProcedureINFOID:0000000001547444
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (24 or AUTO24 is
indicated on front air control as a result of performing self-diagnosis
STEP-2.)
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Turn ignition switch OFF.
2. Disconnect intake sensor connector M92.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector M92
terminal 1 and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
ZJIA0798J
AWIIA0313GB
Te r m i n a l s
Voltag e
(Approx.) (+) (−)
Connector Terminal
Ground
Intake sensor: M92 1 5V
SJIA0825E

HAC-186
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
INSUFFICIENT COOLING
9.CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Check contaminated refrigerant. Refer to HAC-199, "
Working with HFC-134a (R-134a)".
10.CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES >> Perform performance test diagnoses. Refer to HAC-186, "Performance Test Diagnoses".
NO >> GO TO 11.
11 .CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to HAC-189, "
Test Reading".
Is the inspection result normal?
YES >> Perform performance test diagnoses. Refer to HAC-186, "Performance Test Diagnoses".
NO >> GO TO 12.
12.CHECK AIR DUCTS
Check ducts for air leaks.
Is the inspection result normal?
YES >> System OK.
NO >> Repair air leaks.
Performance Test DiagnosesINFOID:0000000001547453
PERFORMANCE TEST DIAGNOSIS

HAC-190
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
INSUFFICIENT COOLING
Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
High-pressure Side is Too Low and Low-pressure Side is Too High
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure
sides are too high.Pressure is reduced soon af-
ter water is splashed on con-
denser.Excessive refrigerant charge in refrig-
eration cycle.Reduce refrigerant until
specified pressure is ob-
tained.
Air suction by cooling fan is in-
sufficient.Insufficient condenser cooling perfor-
mance.
↓
1. Condenser fins are clogged.
2. Improper fan rotation of cooling
fan. Clean condenser.
 Check and repair cooling
fan if necessary.
 Low-pressure pipe is not
cold.
 When compressor is
stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (1.96 bar, 2
kg/cm
2, 28 psi). It then de-
creases gradually thereaf-
ter.Poor heat exchange in condenser
(After compressor operation stops,
high-pressure decreases too slowly.).
↓
Air in refrigeration cycle.Evacuate repeatedly and
recharge system.
Engine tends to overheat. Engine cooling systems malfunction.Check and repair each en-
gine cooling system.
 An area of the low-pressure
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 discharge
flow.
 Expansion valve is open a little
compared with the specification.
↓
Improper expansion valve adjust-
ment.Replace expansion valve.
AC359A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high
and low-pressure side is too low.
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 re-
place malfunctioning
parts.
 Check oil for contami-
nation.
AC360A

INSUFFICIENT COOLING
HAC-191
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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HAC
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P Both High- and Low-pressure Sides are Too Low
Low-pressure Side Sometimes Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low
and low-pressure side is too
high.High- and low-pressure sides
become equal soon after com-
pressor operation stops.Compressor pressure operation
is improper.
↓
Damaged inside compressor
packings.Replace compressor.
No temperature difference be-
tween high- and low-pressure
sides.Compressor pressure operation
is improper.
↓
Damaged inside compressor
packings.Replace compressor.
AC356A
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure
sides are too low. There is a big temperature dif-
ference between liquid tank
outlet and inlet. Outlet tem-
perature is extremely low.
 Liquid tank inlet and expan-
sion valve are frosted.Liquid tank inside is slightly
clogged. Replace liquid tank.
 Check oil for contamination.
 Temperature of expansion
valve inlet is extremely low as
compared with areas near liq-
uid tank.
 Expansion valve inlet may be
frosted.
 Temperature difference oc-
curs somewhere in high-pres-
sure side.High-pressure pipe located be-
tween liquid tank and expansion
valve is clogged. Check and repair malfunc-
tioning parts.
 Check oil for contamination.
Expansion valve and liquid tank
are warm or only cool when
touched.Low refrigerant charge.
↓
Leaking fittings or componentsCheck refrigerant for leaks.
Refer to XXXX CHECKING OF
REFRIG LEAKS .
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.Expansion valve closes a little
compared with the specification.
↓
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion
valve.
3. Outlet and inlet may be
clogged. Remove foreign particles by
using compressed air.
 Replace expansion valve.
 Check oil for contamination.
An area of the low-pressure pipe
is colder than areas near the
evaporator outlet.Low-pressure pipe is clogged or
crushed. Check and repair malfunc-
tioning parts.
 Check oil for contamination.
Air flow volume is not enough or
is too low.Evaporator is frozen. Check intake sensor circuit.
Refer to XXXX INTAKE
SENSOR CIR .
 Replace compressor.
 Repair evaporator fins.
 Replace evaporator.
 Refer to XXXX BLOWER
MOTOR CIR..
AC353A

INTAKE SENSOR
HAC-253
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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HAC
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INTAKE SENSOR
System DescriptionINFOID:0000000001547365
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor (1) is located on the A/C unit. It converts tempera-
ture of air after it passes through the evaporator (2) into a resistance
value which is then input to the front air control.
Intake Sensor Diagnosis ProcedureINFOID:0000000001547366
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted.
LEDs of intake switch (FRE, REC) does not illuminate as a result of
performing self-diagnosis STEP-2.
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector M92
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
ZJIA0798J
AWIIA0348GB
Te r m i n a l s
Voltag e
(Approx.) (+) (−)
Connector Terminal
Ground
Intake sensor: M92 1 5V
SJIA0825E

HAC-300
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
INSUFFICIENT COOLING
>> GO TO 9.
9.CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Check contaminated refrigerant. Refer to HA-21, "
HFC-134a (R-134a) Service Procedure".
10.CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES >> Perform performance test diagnoses. Refer to HAC-300, "Performance Test Diagnoses".
NO >> GO TO 11.
11 .CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to HAC-303, "
Test Reading".
Is the inspection result normal?
YES >> Perform performance test diagnoses. Refer to HAC-300, "Performance Test Diagnoses".
NO >> GO TO 12.
12.CHECK AIR DUCTS
Check ducts for air leaks.
Is the inspection result normal?
YES >> System OK.
NO >> Repair air leaks.
Performance Test DiagnosesINFOID:0000000001547375
PERFORMANCE TEST DIAGNOSIS

HAC-304
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
INSUFFICIENT COOLING
Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
High-pressure Side is Too Low and Low-pressure Side is Too High
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure
sides are too high.Pressure is reduced soon af-
ter water is splashed on con-
denser.Excessive refrigerant charge in refrig-
eration cycle.Reduce refrigerant until
specified pressure is ob-
tained.
Air suction by cooling fan is in-
sufficient.Insufficient condenser cooling perfor-
mance.
↓
1. Condenser fins are clogged.
2. Improper fan rotation of cooling
fan. Clean condenser.
 Check and repair cooling
fan if necessary.
 Low-pressure pipe is not
cold.
 When compressor is
stopped high-pressure val-
ue quickly drops by approx-
imately 196 kPa (1.96 bar, 2
kg/cm
2, 28 psi). It then de-
creases gradually thereaf-
ter.Poor heat exchange in condenser
(After compressor operation stops,
high-pressure decreases too slowly.).
↓
Air in refrigeration cycle.Evacuate repeatedly and
recharge system.
Engine tends to overheat. Engine cooling systems malfunction.Check and repair each en-
gine cooling system.
 An area of the low-pressure
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 discharge
flow.
 Expansion valve is open a little
compared with the specification.
↓
Improper expansion valve adjust-
ment.Replace expansion valve.
AC359A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high
and low-pressure side is too low.
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 re-
place malfunctioning
parts.
 Check oil for contami-
nation.
AC360A