Nissan Maxima Service and Repair Manual: Refrigerant
Description
CONNECTION OF SERVICE TOOLS AND EQUIPMENT
- Shut-off valve
- A/C service valve
- Recovery/recycling/recharging equipment
- Refrigerant container (HFC-134a)
- Weight scale (J-39650)
- Vacuum pump (J-39649)
- Manifold gauge set (J-39183)
- Preferred (best) method
- Alternative method
- For charging
Leak Test
CHECK REFRIGERANT LEAKAGE USING FLUORESCENT LEAK DETECTION DYE
- Install a fender cover (1).
- Wear UV safety goggles (2) provided with refrigerant dye leak
detection kit (J-43926).
- Connect power cable (4) of UV lamp (6) to positive and negative
terminals of the battery (3).
- Press UV lamp switch (5) and check A/C system for refrigerant leakage.
(Where refrigerant leakage occurs, fluorescent leak detection dye appears
in green color.)
WARNING: Do not look directly into UV lamp
light source.
NOTE:
- For continuous operating time of UV lamp, follow the
manufacturer operating instructions.
- Illuminate piping joints from different angles using UV lamp
and check that there is no leakage.
- Use a mirror in area that is difficult to see to check
refrigerant leakage.
- Refrigerant leakage from evaporator can be detected by soaking
cotton swab or a similar material with drain hose water and illuminating
it using UV lamp.
- Dust, dirt and packing materials adhesive used for condenser,
evaporator, and other locations may fluoresce.
Be careful not to
misidentify leakage.
- Repair or replace parts where refrigerant leakage occurs and wipe
off fluorescent leak detection dye. NOTE:
Completely wipe off fluorescent leak detection dye from gaps between parts,
screw threads, and others using a cotton swab or similar materials.
- Use a UV lamp to check that no fluorescent leak detection dye
remains after finishing work.
WARNING: Do not look directly into UV lamp
light source.
NOTE:
- For continuous operating time of UV lamp, follow the
manufacturer operating instructions.
- Dust, dirt, and packing materials adhesive used for condenser,
evaporator, and other locations may fluoresce.
Be careful not to
misidentify leakage.
CHECK REFRIGERANT LEAKAGE USING ELECTRICAL LEAK DETECTO
WARNING: Do not check refrigerant leakage
while the engine is running.
CAUTION: Be careful of the following items
so that inaccurate checks or misidentifications are avoided.
- Do not allow refrigerant vapor, shop chemical vapors,
cigarette smoke or others around the vehicle.
- Always check refrigerant leakage in a low air flow environment
so that refrigerant may not disperse when leakage occurs.
- Stop the engine.
- Connect recovery/recycling/recharging equipment or manifold gauge
set (J-39183-C) to A/C service valve.
- Check that A/C refrigerant pressure is 345 kPa (3.52 kg/cm2, 50
psi) or more when temperature is 16C (61F) or more. When pressure is
lower than the specified value, recycle refrigerant completely and fill
refrigerant to the specified level. NOTE:
Leakages may not be detected if A/C refrigerant pressure is 345 kPa (3.52
kg/cm2, 50 psi) or less when temperature is less than 16C (61F).
- Clean area where refrigerant leakage check is performed and check
refrigerant leakage along all surfaces of pipe connections and A/C system
components using electrical leak detector (J-41995) probe.
CAUTION:
- Continue checking when a leakage is found. Always continue and
complete checking along all pipe connections and A/C system components
for additional leakage.
- When a leakage is detected, clean leakage area using
compressed air and check again.
- When checking leakage of cooling unit inside, always clean
inside of drain hose so that the probe surface may not be exposed to
water or dirt.
NOTE:
- Always check leakage starting from high-pressure side and
continue to low-pressure side.
- When checking leakage of cooling unit inside, operate blower
fan motor for 15 minutes or more at the maximum fan speed while the
engine is stopped, and then insert electrical leak detector probe into drain
hose and hold for 10 minutes or more.
- When disconnecting shut-off valve that is connected to A/C
service valve, always evacuate remaining refrigerant so that
misidentification can be avoided.
- Repair or replace parts where refrigerant leakage is detected.
(Leakage is detected but leakage area is unknown.)
- Start the engine and set A/C control in the following conditions.
- A/C switch ON
- Air flow: VENT (ventilation)
- Intake door position: Recirculation
- Temperature setting: Full cold
- Fan (blower) speed: Maximum speed set
- Run the engine at approximately 1,500 rpm for 2 minutes or more.
- Stop the engine. Check again for refrigerant leakage. Go to step
4.
WARNING: Be careful not to get burned when
the engine is hot.
NOTE:
- Start refrigerant leakage check immediately after the engine
is stopped.
- When refrigerant circulation is stopped, pressure on the
lowpressure side rises gradually, and after this, pressure on the
high-pressure side falls gradually.
- The higher the pressure is, the easier it is to find the
refrigerant leakage.
Recycle Refrigerant
WARNING:
- Always use HFC-134a for A/C refrigerant. If CFC-12 is
accidentally charged, compressor is damaged due to insufficient
lubrication.
- Always observe and follow precautions described on refrigerant
container. Incorrect handling may result in an explosion of refrigerant
container, frostbite or the loss of eyesight.
- Do not breathe A/C refrigerant and oil vapor or mist. Exposure
may irritate eyes, nose, or throat.
- Do not allow HFC-134a to be exposed to an open flame or others
because it generates poisonous gas when in contact with high temperature
objects. Keep workshop well ventilated.
- Perform oil return operation. Refer to HA-30, "Perform Oil Return
Operation". (If refrigerant or oil leakage is detected in a large amount,
omit this step, and go to step 2.) CAUTION:
Do not perform oil return operation if a large amount of refrigerant or oil
leakage is detected.
- Check gauge pressure readings of recovery/recycling/recharging
equipment. When remaining pressure exists, recycle refrigerant from
high-pressure hose and low-pressure hose. NOTE:
Follow manufacturer instructions for the handling or maintenance of the
equipment. Do not fill the equipment with non-specified refrigerant.
- Remove A/C service valve cap from the vehicle.
- Connect recovery/recycling/recharging equipment to A/C service
valve.
- Operate recovery/recycling/recharging equipment, and recycle
refrigerant from the vehicle.
- Evacuate air for 10 minutes or more to remove any remaining
refrigerant integrated to compressor oil, etc.
- Refrigerant recycle operation is complete.
Charge Refrigerant
WARNING:
- Always use HFC-134a for A/C refrigerant. If CFC-12 is
accidentally charged, compressor is damaged due to insufficient
lubrication.
- Always observe and follow precautions described on refrigerant
container. Incorrect handling may result in an explosion of refrigerant
container, frostbite, or the loss of eyesight.
- Do not breathe A/C refrigerant and oil vapor or mist. Exposure
my irritate eyes, nose, or throat.
- Do not allow HFC-134a to be exposed to an open flame or others
because it generates poisonous gas when in contact with high temperature
objects. Keep workshop well ventilated.
- Connect recovery/recycling/recharging equipment to the A/C service
valve.
- Operate recovery/recycling/recharging equipment, and evacuate air
from A/C system for 25 minutes or more. CAUTION:
Evacuate air for 15 minutes or more if the parts are replaced.
- Check the airtightness of A/C system for 25 minutes or more. If
pressure raises more than the specified level, charge A/C system with
approximately 200g refrigerant and check that there is no refrigerant
leakage.
Refer to HA-26, "Leak Test". CAUTION:
Check the airtightness for 15 minutes or more if the parts are replaced.
- If parts other than compressor are replaced, fill compressor oil
according to parts that are replaced.
- Charge the specified amount of refrigerant to A/C system.
- Check that A/C system operates normally.
- Disconnect recovery/recycling/recharging equipment. (Collect the
refrigerant from the high-pressure hose and low-pressure hose of
recovery/recycling/recharging equipment.)
- Install A/C service valve cap.
- Refrigerant charge is complete.
Description
MAINTENANCE OF OIL LEVEL
The compressor oil is circulating in the system together with the
refrigerant. It is necessary to fill compressor with oil when replacing A/C
system parts or ...
Other materials:
C1708 - C1711 data from transmitter not being received
Description
Tire pressure data for one or more transmitters is not being received by the
BCM.
DTC Logic
NOTE: The Signal Tech II Tool (J-50190) can
be used to perform the following functions. Refer to the Signal Tech II User
Guide for additional information.
Activate and display T ...
Trunk lamp switch
Description
Detects trunk open/close condition.
Component Function Check
1. CHECK FUNCTION
With CONSULT
Check TRNK/HAT MNTR in Data Monitor mode with CONSULT.
Diagnosis Procedure
1. CHECK TRUNK LAMP SWITCH INPUT SIGNAL
Turn ignit ...
Horizontal synchronizing (HP) signal circuit
Description
In composite image (AUX image, camera image), transmit the vertical
synchronizing (VP) signal and horizontal synchronizing (HP) signal from
display unit to AV control unit so as to synchronize the RGB images displayed
with AV control unit such as the image quality adjusting menu, ...