Nissan Sentra Service Manual: Basic inspection
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
DETAILED FLOW
1.LISTEN TO CUSTOMER COMPLAINT
Listen to customer complaint. Get detailed information about the conditions and environment when the symptom occurs.
>> GO TO 2.
2.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK
Verify the symptom with operational check. Refer to HAC-157, "Work Procedure".
>> GO TO 3.
3.GO TO APPROPRIATE TROUBLE DIAGNOSIS
Go to appropriate trouble diagnosis. Refer to HAC-181, "Symptom Table".
>> GO TO 4.
4.REPAIR OR REPLACE
Repair or replace the specific parts.
>> GO TO 5.
5.FINAL CHECK
Final check.
Is the inspection result normal? YES >> Inspection End.
NO >> GO TO 3.
OPERATION INSPECTION
Work Procedure
DESCRIPTION
The purpose of the operational check is to check that the individual system operates normally.
Check condition : Engine running at normal operating temperature.
Check condition : Blower control dial in OFF position.
Check condition : REC off (LED extinguished).
Check condition : VENT selected (LED illuminated).
Check condition : DEF off (LED extinguished).
OPERATION INSPECTION
1.CHECK BLOWER
- Rotate the blower control dial clockwise one detent. Blower should operate on low speed.
- Rotate the blower control dial one detent at a time, and continue checking blower speed until all speeds are checked.
- Leave blower on maximum speed.
Is the test result normal? YES >> GO TO 2.
NO >> Refer to HAC-174, "Diagnosis Procedure".
2.CHECK A/C SWITCH LED
- Press A/C switch.
- A/C switch indicator should turn ON.
Is the test result normal? YES >> GO TO 3.
NO >> Refer to HAC-168, "Diagnosis Procedure".
3.CHECK A/C SWITCH
Confirm that the compressor clutch engages (sound or visual inspection).
Is the test result normal? YES >> GO TO 4.
NO >> Refer to HAC-178, "Diagnosis Procedure".
4.CHECK FRONT AIR CONTROL MODE LEDS
- Press D/F (
), FOOT (
), B/L
, and VENT
, MAX A/C, and DEF (
). - Each button indicator should illuminate.
Is the test result normal? YES >> GO TO 5.
NO >> Refer to HAC-160, "A/C SWITCH ASSEMBLY : Diagnosis Procedure".
5.CHECK DISCHARGE AIR
- Press D/F (
), FOOT (
), B/L
, and VENT
and DEF (
). - Confirm that discharge air comes out according to the air distribution table. Refer to HAC-123, "Door Control".
Is the test result normal? YES >> GO TO 6.
NO >> Refer to HAC-181, "Symptom Table".
6.CHECK REC LED
- Press DEF (
) and make sure
LED is off. - Make sure VENT (
) or B/L (
) is selected. - Press REC (
) switch one
time. REC indicator should illuminate. - Press REC (
) switch one
more time. REC indicator should go off.
Is the test result normal? YES >> GO TO 7.
NO >> Refer to HAC-160, "A/C SWITCH ASSEMBLY : Diagnosis Procedure".
7.CHECK INTAKE DOOR OPERATION
- Press REC (
) switch one
time. REC indicator should illuminate. - Listen to the sound of the air coming out of the vent.
- Press REC (
) switch one
more time. REC indicator should go off. - There should be an audible change to the sound of the air flowing out of the vent.
Is the test result normal? YES >> GO TO 8.
NO >> Refer to HAC-165, "Diagnosis Procedure".
8.CHECK TEMPERATURE DECREASE
- Press A/C switch.
- Rotate temperature control dial counterclockwise until maximum cold.
- Check for cold air at selected discharge air outlets.
Is the test result normal? YES >> GO TO 9.
NO >> Refer to HAC-182, "Component Function Check".
9.CHECK TEMPERATURE INCREASE
- Rotate temperature control dial clockwise until maximum hot.
- Check for hot air at appropriate discharge air outlets.
Is the test result normal? YES >> Inspection End.
NO >> Refer to HAC-184, "Component Function Check".
Wiring diagram
Manual air conditioning system
Wiring Diagram
Manual heater system
Wiring Diagram
...
DTC/circuit diagnosis
POWER SUPPLY AND GROUND CIRCUIT
A/C AUTO AMP.
A/C AUTO AMP. : Diagnosis Procedure
Regarding Wiring Diagram information, refer to HAC-145, "Wiring Diagram" or
HAC-152, "Wiring Diagr ...
Other materials:
C1607, C1608 EPS Control unit
DTC Logic
DTC DETECTION LOGIC
Dtc
Display item
Malfunction detected condition
Possible cause
C1607
EEPROM
When the memory (EEPROM) system malfunction is
detected in EPS control unit.
Eps control unit
C1608
CONTROL UNIT
When the internal malfuncti ...
P0643 Sensor power supply
Description
ECM supplies a voltage of 5.0 V to some of the sensors systematically divided
into 2 groups, respectively.
Accordingly, when a short circuit develops in a sensor power source, a
malfunction may occur simultaneously
in the sensors belonging to the same group as the shorted-circui ...
Variable voltage control system
CAUTION
Do not ground accessories directly to
the battery terminal. Doing so will bypass
the variable voltage control system
and the vehicle battery may not
charge completely.
Use electrical accessories with the engine
running to avoid discharging the
vehicle battery.
Your v ...
