NISSAN ALMERA N16 2003 Electronic Repair Manual

TROUBLE DIAGNOSIS
ATC-51
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AT C
Operational CheckEJS001ZI
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1. Set the temperature 90°F or 32°C.
2. Press OFF switch.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous tempera-
ture.
7. Press OFF switch.
If NG, go to ATC-99, "
Memory Function" .
If OK, continue with next check.
CHECKING BLOWER
1. Press fan switch (up side) one time. Blower should operate on
low speed.The fan symbol should have one blade lit .
2. Press fan switch (up side) one more time, and continue check-
ing blower speed and fan symbol until all speeds are checked.
3. Leave blower on MAX speed.
If NG, go to ATC-69, "
Blower Motor Circuit" .
If OK, continue with next check.Conditions :Engine running and at usual operating temperature
RJIA1683E
RJIA1684E

ATC-52
TROUBLE DIAGNOSIS
CHECKING DISCHARGE AIR
1. Press mode switch four times and DEF button.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distri-
bution table. Refer to ATC-27, "
Discharge Air Flow" .
Intake door position is checked in the next step.
If NG, go to AT C - 5 9 , "
Mode Door Motor Circuit" .
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (visual inspection)
and intake door position is at FRESH when the DEF is selected.
RJIA1685E
RHA280I

TROUBLE DIAGNOSIS
ATC-53
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AT C
CHECKING RECIRCULATION
1. Press recirculation (REC) switch one time. Recirculation indica-
tor should illuminate.
2. Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to ATC-66, "
Intake Door Motor Circuit" .
If OK, continue with next check.
CHECKING FRESH SWITCH
1. Press fresh (FRE) switch one time. Fresh switch indicator
should illuminate.
2. Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to ATC-66, "
Intake Door Motor Circuit" .
If OK, continue with next check.
CHECKING TEMPERATURE DECREASE
1. Turn the temperature dial until 18°C (60°F) is displayed.
2. Check for cold air at discharge air outlets.
If NG, go to ATC-86, "
Insufficient Cooling" .
If OK, continue with next check.
CHECKING TEMPERATURE INCREASE
1. Turn the temperature dial until 32°C (90°F) is displayed.
2. Check for hot air at discharge air outlets.
If NG, go to ATC-95, "
Insufficient Heating" .
If OK, continue with next check.
RJIA1686E
RJIA1687E
RJIA1688E
RJIA1689E

ATC-54
TROUBLE DIAGNOSIS
CHECKING AUTO MODE
1. Press temperature dial.
2. Display should indicate AUTO (not ECON).
●Confirm that the compressor clutch engages (audio or visual
inspection). (Discharge air and blower speed will depend on
ambient, in-vehicle, and set temperatures.)
If NG, go to AT C - 5 5 , "
Power Supply and Ground Circuit for Auto
Amp." , then if necessary, go to AT C - 7 5 , "Magnet Clutch Circuit" .
If all operational check are OK (symptom can not be duplicated), go
to Incident Simulation Tests in GI-22, "How to Perform Efficient Diag-
nosis for an Electrical Incident" and perform tests as outlined to sim-
ulate driving conditions environment. If symptom appears, refer to
AT C - 2 9 , "
SYMPTOM TABLE" and perform applicable trouble diag-
nosis procedures.
RJIA1690E

TROUBLE DIAGNOSIS
ATC-55
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AT C
Power Supply and Ground Circuit for Auto Amp.EJS001ZJ
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
COMPONENT DESCRIPTION
Automatic Amplifier (Auto Amp.)
The auto amplifier has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor, mode door motor, intake door
motor, blower motor and compressor are then controlled.
The auto amplifier is unitized with control mechanisms. When the
various switches and temperature adjustment dial are operated, data
is input to the auto amp. from the AV AND NAVI CONTROL UNIT (or
DISPLAY) using multiplex communication.
Self-diagnostic functions are also built into auto amplifier to provide
quick check of malfunctions in the auto air conditioner system.
Potentio Temperature Control (PTC)
The PTC is built into the multi-function switch. It can be set at an
interval of 0.5°C (1.0°F) in the 18°C (60°F) to 32°C (90°F) tempera-
ture range by turning the temperature dial. The set temperature is
displayed.
*1 EL-11, "POWER SUPPLY ROUT-
ING"*2AT C - 5 1 , "Operational Check"*3AT C - 5 6 , "DIAGNOSTIC PROCE-
DURE FOR A/C SYSTEM"
RJIA1691E
RJIA0750E
RJIA1692E

ATC-56
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
1. CHECK POWER SUPPLY CIRCUIT FOR AUTO AMP.
OK or NG
OK >> GO TO 2.
NG >> Check 10A fuses (Nos. 10 and 12) and 15A fuses (Nos. 14 and 16) located in the fuse block.
●If fuses are OK, check for open circuit in wiring harness. Repair or replace as necessary.
●If fuses are NG, replace fuse and check wiring harness for short circuit. Repair or replace as
necessary.
2. CHECK GROUND CIRCUIT FOR AUTO AMP.
OK or NG
OK >> Replace auto amp. INSPECTION END
NG >> Repair or replace harness.
RJIA0768E
Terminal Ignition switch position
(+)
(-) OFF ACC ON
Auto amp.
connectorTerminal No.
(Wire color)
M20526 (R/B)
GroundApprox.
12VApprox.
12VApprox.
12V
27 (Y/G)Approx.
0VApprox.
0VApprox.
12V
33 (L/W)Approx.
0VApprox.
12VApprox.
12V
RJIA0769E
Terminal
Continuity (+)
(-)
Auto amp. con-
nectorTe r m i n a l N o .
(Wire color)
M205 24 (B) Ground Yes
RJIA0770E

TROUBLE DIAGNOSIS
ATC-57
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AT C
LAN System CircuitEJS001ZK
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR LAN SYSTEM CIRCUIT
1.CHECK POWER SUPPLY FOR AUTO AMP. SIDE
OK or NG
OK >> GO TO 2.
NG >> Replace auto amp.
2.CHECK SIGNAL FOR AUTO AMP. SIDE
Confirm A/C LAN signal using an oscilloscope.
OK or NG
OK >> GO TO 3.
NG >> Replace auto amp.
RJIA1326E
Terminal
Vo lta g e (+)
(-)
Auto amp. connec-
torTe r m i n a l N o .
(Wire color)
M205 21 (G/Y) Ground Approx. 12V
RJIA0273E
Terminal
Vo l ta g e (+)
(-)
Auto amp. connectorTerminal No.
(Wire color)
M204 5 (R/Y) Ground
HAK0652D

ATC-58
TROUBLE DIAGNOSIS
3. CHECK POWER SUPPLY FOR MOTOR SIDE
OK or NG
OK >> GO TO 4.
NG >> Replace harness or connector.
4. CHECK SIGNAL FOR MOTOR SIDE
Confirm A/C LAN signal using an oscilloscope.
OK or NG
OK >> GO TO 5.
NG >> Replace harness or connector.
5. CHECK MOTOR GROUND CIRCUIT
OK or NG
OK >> GO TO 6.
NG >> Replace harness or connector.
Door motorTerminal
Voltage (+)
(-)
ConnectorTerminal No.
(Wire color)
Mode M189 1 (G/Y)
GroundApprox.
12V Air mix M188 1 (G/Y)
Intake M104 1 (G/Y)
RJIA0509E
Door motorTerminal
Voltage (+)
(-)
ConnectorTerminal No.
(Wire color)
Mode M189 3 (R/Y)
Ground Air mix M188 3 (R/Y)
Intake M104 3 (R/Y)
HAK0652D
Door motorTerminal
Continuity (+)
(-)
ConnectorTerminal No.
(Wire color)
Mode M189 2 (B)
Ground Yes Air mix M188 2 (B)
Intake M104 2 (B)
RJIA0511E

TROUBLE DIAGNOSIS
ATC-59
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AT C
6.CHECK MOTOR OPERATION
Disconnect and reconnect the motor connector and confirm the motor operation.
OK or NG
OK >> (Return to operate normally.)
●Poor contacting the motor connector
NG >> (Does not operate normally.)
●GO TO 7
7.CHECK MODE DOOR MOTOR OPERATION
1. Disconnect mode door motor and air mix door motor connector.
2. Reconnect mode door motor connector and confirm the mode door motor operation.
OK or NG
OK >> (Mode door motor operates normally.)
●GO TO 8
NG >> (Mode door motor does not operate normally.)
●Replace the mode door motor.
8.CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect mode door motor connector.
2. Reconnect air mix door motor connector and confirm the air mix door motor operation.
OK or NG
OK >> (Air mix door motor operates normally.)
●GO TO 9
NG >> (Air mix door motor does not operate normally.)
●Replace the air mix door motor.
9.CHECK INTAKE DOOR MOTOR OPERATION
1. Disconnect air mix door motor connector.
2. Reconnect intake door motor connector and confirm the intake door motor operation.
OK or NG
OK >> (Intake door motor operates normally.)
●Replace auto amp.
NG >> (Intake door motor does not operate normally.)
●Replace intake door motor.
Mode Door Motor CircuitEJS001ZL
SYMPTOM:
●Air outlet does not change.
●Mode door motor does not operate normally.

ATC-60
TROUBLE DIAGNOSIS
INSPECTION FLOW
*1AT C - 2 7 , "Discharge Air Flow"*2ATC-51, "Operational Check"*3AT C - 4 2 , "Self-diagnosis Function",
see No.1
*4AT C - 4 2 , "
Self-diagnosis Function",
see No. 5*5ATC-100, "Ambient Sensor Circuit"*6ATC-102, "In-vehicle Sensor Circuit"
*7ATC-105, "Sunload Sensor Circuit"*8ATC-63, "Air Mix Door Motor Circuit"*9AT C - 4 2 , "Self-diagnosis Function",
see No.14
*10AT C - 5 7 , "
LAN System Circuit"*11ATC-62, "COMPONENT DESCRIP-
TION"
*12AT C - 5 1 , "Operational Check"
*13AT C - 2 9 , "SYMPTOM TABLE"*14ATC-108, "Intake Sensor Circuit"*15AT C - 5 2 , "CHECKING DISCHARGE
AIR"
RJIA1693E