Nissan Sentra Service Manual: OIL
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 when a large amount of refrigerant
leakage is detected. It is important
to always maintain oil level within the specified level, otherwise the following
conditions may occur:
- Insufficient oil amount: Stuck compressor
- Excessive oil amount: Insufficient cooling (caused by insufficient heat
exchange)
Oil Type : A/C System Oil Type DH-PS
Inspection
If a compressor is malfunctioning (internal noise, insufficient cooling),
check the compressor oil.
1.COMPRESSOR OIL JUDGMENT
- Remove the compressor. Refer to HA-31, "COMPRESSOR : Removal and
Installation".
- Sample compressor oil and judge below according to the figure.

Judgement result 1>>Replace compressor only.
Judgement result 2>>Replace compressor and liquid tank.
Perform oil return operation
CAUTION:
If a large amount of refrigerant or oil leakage is detected, do not
perform oil return operation.
- Start the engine and set to the following conditions:
- Engine speed: Idling to 1,200 rpm
- A/C switch: ON
- Fan (blower) speed: Maximum speed set
- Intake door position: Recirculation
- Temperature setting: Full cold
- Perform oil return operation for approximately 10 minutes.
- Stop the engine.
- Oil return operation is complete
Oil adjusting procedure for components replacement except compressor
Fill with oil for the amount that is calculated according to the following
conditions.
Example: Oil amount to be added when replacing evaporator and liquid tank [m (US
fl oz, Imp fl oz)] = 45
(1.5, 1.6) + 15 (0.5, 0.5) + α


Oil adjusting procedure for compressor replacement

- New compressor
- Old compressor
- Recovery/recycling equipment
- Measuring cup X
- Measuring cup Y
- New oil
- Drain oil from the new compressor
into clean container
- Record amount of oil recovered
- Add an additional 5 m (0.2 US fl oz,
0.2 Imp fl oz) of new oil when replacing
liquid tank
- Install new oil equal to recorded
amounts in measuring cups X plus Y
- Before connecting recovery/recycling equipment to vehicle, check
recovery/recycling equipment gauges.
No refrigerant pressure should be displayed. If NG, recover refrigerant from
equipment lines.
- Connect recovery/recycling equipment to vehicle. Confirm refrigerant
purity in supply tank using recovery/
recycling equipment and refrigerant identifier. If NG, refer to HA-4,
"Precautions For Refrigerant System
Service".
- Confirm refrigerant purity in vehicle A/C system using
recovery/recycling equipment and refrigerant identifier.
If NG, refer to HA-4, "Precautions For Refrigerant System Service".
- Discharge refrigerant into the refrigerant recovery/recycling equipment.
Measure oil discharged into the
recovery/recycling equipment.
- Drain the oil from the “old” (removed) compressor into a graduated
container and recover the amount of
oil drained.
- Drain the oil from the “new” compressor into a separate, clean
container.
- Measure an amount of new oil installed equal to amount drained from
“old” compressor. Add this oil to
“new” compressor through the suction port opening.
- Measure an amount of new oil equal to the amount recovered during
discharging. Add this oil to “new”
compressor through the suction port opening.
- If the liquid tank also needs to be replaced, add an additional 5 m (0.2
US fl oz, 0.2 Imp fl oz) of oil at this
time.
CAUTION:
Do not add the 5 m (0.2 US fl oz, 0.2 Imp fl oz) of oil if only
replacing the compressor and not the
liquid tank.
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-3965 ...
Inspection
INSPECTION PROCEDURE
Connect recovery/recycling/recharging equipment (for HFC-134a) or
manifold gauge.
Start the engine, and set to the following condition.
Test condition
...
Other materials:
P2118 Throttle control motor
DTC Logic
DTC DETECTION LOGIC
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P2118
ETC MOT-B1
(Throttle actuator control
motor current range/
performance)
ECM detects short in both circuits between
ECM a ...
Warning signals
To help prevent the vehicle from moving unexpectedly
by erroneous operation of the Intelligent
Key or to help prevent the vehicle from being
stolen, a chime or buzzer sounds from inside and
outside the vehicle and a warning light comes on
in the instrument panel.
When a chime or beep sounds ...
Dtc/circuit diagnosis
U1000 can comm circuit
Description
Refer to lan-7, "can communication system : system description".
DTC Logic
Dtc detection logic
Note:
U1000 can be set if a module harness was disconnected and reconnected,
perhaps during a repair. Confirm
that there are actual can diagnostic sym ...
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