NISSAN ALMERA N16 2003 Electronic Repair Manual

TROUBLE DIAGNOSIS
ATC-71
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AT C
In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56°C (133°F), at which time the blower speed will increase to the objective speed.
Start Up From Usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the A/C button is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
Blower Speed Compensation
Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower
low speed is usual low speed (approx. 4V). During high sunload conditions, the auto amp causes the blower
fan speed to increase.(Approx. 7V)
Fan Speed Control Specification
COMPONENT DESCRIPTION
Fan Control Amplifier
The fan control amplifier is located on the heater & cooling unit. The
fan control amp. receives a gate voltage from the auto amp. to step-
lessly maintain the blower fan motor voltage in the 4 to 12 volt range.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
fan speed control.
RJIA0522E
RHA625H
RJIA0786E

ATC-72
TROUBLE DIAGNOSIS
1. CHECK POWER SUPPLY FOR BLOWER MOTOR
Disconnect blower motor harness connector.
OK or NG
OK >> GO TO 2.
NG >> Check power supply circuit and 15A fuses (Nos. 14 and
16, located in the fuse block). Refer to EL-11, "POWER
SUPPLY ROUTING".
●If OK, check for open circuit in wiring harness. Repair or replace as necessary.
●If NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.
2. CHECK FAN FEED BACK CIRCUIT
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK BLOWER MOTOR
Refer to COMPONENT INSPECTION.
OK or NG
OK >> GO TO 4.
NG >> Replace blower motor.
4. CHECK POWER SUPPLY FOR FAN CONTROL AMP.
1. Reconnect blower motor connector.
2. Disconnect fan control amp. harness connector.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
Terminal
Vo l ta g e (+)
(-)
Blower motor con-
nectorTerminal No.
(Wire color)
M59 1 (L/W) Ground Approx. 12V
RJIA0524E
Te r m i n a l
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M205 34 (L/B) Ground Fan speed: 1st Approx. 8V
RJIA0787E
Te r m i n a l
Voltag e (+)
(-)
Fan control amp.
connectorTerminal No.
(Wire color)
M190 3 (L/B) Ground Approx. 12V
RJIA0526E

TROUBLE DIAGNOSIS
ATC-73
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5.CHECK GROUND CIRCUIT FOR FAN CONTROL AMP.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6.CHECK FOR AUTO AMP. OUTPUT
Reconnect the fan control amp. harness connector.
OK or NG
OK >> GO TO 9.
NG >>
●If the voltage is less than 2.5V: GO TO 8.
●If the voltage is more than 9.0V: GO TO 7.
7.CHECK CIRCUIT CONTINUITY BETWEEN AUTO AMP. AND FAN CONTROL AMP.
Disconnect the auto amp. harness connector and fan control amp.
harness connector.
OK or NG
OK >> Replace fan control amp.
NG >> Repair harness or connector.
8.CHECK FAN CONTROL AMP.
Disconnect the fan control amp. harness connector.
OK or NG
OK >> GO TO 9.
NG >> Replace fan control amp.
Te r m i n a l
Continuity (+)
(-)
Fan control amp.
connectorTerminal No.
(Wire color)
M190 1 (B) Ground Yes
RJIA0527E
Terminal
Condition Voltage (+)
(-) Fan control
amp. connec-
torTe r m i n a l N o .
(Wire color)
M190 2 (L/Y) GroundFan speed: 1 - 4 Approx. 2.5 - 3.5
Fan speed: 5 Approx. 9.0
RJIA0528E
Terminal
Continuity Auto amp. Fan control amp.
ConnectorTerminal No.
(Wire color)Connector Terminal No.
(Wire color)
M205 35 (L/Y) M190 2 (L/Y) Yes
RJIA0788E
Terminal
Continuity (+) (-)
Fan control
amp. connectorTe r m i n a l N o .
(Wire color)Fan control
amp. connectorTerminal No.
(Wire color)
M190 2 M190 1 Yes
RJIA0530E

ATC-74
TROUBLE DIAGNOSIS
9. CHECK CIRCUIT CONTINUITY BETWEEN AUTO AMP. AND FAN CONTROL AMP.
OK or NG
OK >> Replace auto amp.
NG >> Repair harness or connector.
COMPONENT INSPECTION
Blower Motor
Confirm smooth rotation of the blower motor.
●Ensure that there are no foreign particles inside the intake unit.
Te r m i n a l
Continuity (+) (-)
Auto amp.
connectorTerminal No.
(Wire color)Fan control
amp. Con-
nectorTe r m i n a l N o .
(Wire color)
M205 34 (L/B) M190 3 (L/B) Yes
RJIA0789E
RJIA0790E

TROUBLE DIAGNOSIS
ATC-75
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Magnet Clutch CircuitEJS001ZP
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1ATC-42, "Self-diagnosis Function",
see No.1.*2ATC-100, "Ambient Sensor Circuit"*3ATC-102, "In-vehicle Sensor Circuit"
*4ATC-105, "Sunload Sensor Circuit"*5AT C - 6 3 , "Air Mix Door Motor Circuit"*6ATC-42, "Self-diagnosis Function",
see No. 14.
*7ATC-75, "
Magnet Clutch Circuit"*8AT C - 9 2 , "TROUBLE DIAGNOSES
FOR UNUSUAL PRESSURE"
*9ATC-51, "Operational Check"
*10ATC-42, "Self-diagnosis Function"
see No.5 or 7.*11AT C - 2 9 , "
SYMPTOM TABLE"*12ATC-108, "Intake Sensor Circuit"
RJIA1697E

ATC-76
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Auto amplifier controls compressor operation by ambient temperature and signal from ECM.
Low Temperature Protection Control
Auto amplifier will turn the compressor ON or OFF as determined by
a signal detected by ambient sensor.
When ambient temperatures are greater than −2°C (28°F), the com-
pressor turns ON. The compressor turns OFF when ambient temper-
atures are less than −5°C (23°F).
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH (WITH CAN SYSTEM)
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
RHA094GB
RJIA1698E

TROUBLE DIAGNOSIS
ATC-77
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1.CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector.
OK or NG
OK >> Check magnet clutch coil.
1. If NG, replace magnet clutch. Refer to ATC-138,
"Compressor Clutch" .
2. Go to AT C - 4 3 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-diagnosis
STEP-4. Confirm that magnet clutch operation is usual.
NG >> Disconnect A/C relay. And GO TO 2.
2.CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND COMPRESSOR
OK or NG
OK >> Check harness for short. And GO TO 3.
NG >> Repair harness or connector.
3.CHECK POWER SUPPLY FOR A/C RELAY
Disconnect A/C relay.
OK or NG
OK >> GO TO 4.
NG >> Check power supply circuit and 10A (No.15) fuse at fuse
block. Refer to EL-11, "POWER SUPPLY ROUTING" .
●If OK, check for open circuit in wiring harness. Repair or replace as necessary.
●If NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.
4.CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to ATC-85, "
A/C Relay" .
OK or NG
OK >> Reconnect A/C relay. And GO TO 5.
NG >> 1. Replace A/C relay.
2. Go to AT C - 4 3 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-diagnosis
STEP-4. Confirm that magnet clutch operation is usual.
Terminal
Vo lta g e (+)
(-)
Compressor
connectorTe r m i n a l N o .
(Wire color)
E25 1 (L/R) Ground Battery voltage
RJIA0295E
Terminal
Continuity (+) (-)
A/C relay con-
nectorTerminal No.
(Wire color)Compressor
connectorTerminal No.
(Wire color)
E9 3 (L/R) E25 1 (L/R) Yes
RJIA0793E
Terminal
Vo l ta g e (+)
(-)
A/C relay con-
nectorTerminal No.
(Wire color)
E9 1 (L/Y)
Ground Battery voltage
E9 5 (L/Y)
RJIA0794E

ATC-78
TROUBLE DIAGNOSIS
5. CHECK COIL SIDE CIRCUIT OF A/C RELAY
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6. CHECK AMBIENT SENSOR
Refer to ATC-100, "
Ambient Sensor Circuit" .
OK or NG
OK >>●With gasoline engine: GO TO 7.
●With diesel engine: GO TO 8.
NG >> Repair or replace the malfunctioning part(s).
7. CHECK REFRIGERANT PRESSURE SENSOR (WITH GASOLINE ENGINE)
Refer to AT C - 8 5 , "
Refrigerant Pressure Sensor (With Gasoline Engine)" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace the malfunctioning part(s).
8. CHECK COMPRESSOR FEED BACK SIGNAL
OK or NG
OK >> GO TO 9.
NG >> GO TO 16.
Terminal
Continuity (+) (-)
A/C relay
connectorTerminal No.
(Wire color)Smart
entrance con-
trol unit con-
nectorTerminal No.
(Wire color)
E9 2 (L) M195 41 (L) Yes
RJIA0795E
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M204 18 (BR/W) GroundA/C SW: ON Approx. 0V
A/C SW: ON
(When refriger-
ant pressure sen-
sor connector is
disconnected)Approx. 5V
RJIA0796E

TROUBLE DIAGNOSIS
ATC-79
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9.CHECK FAN ON SIGNAL
OK or NG
OK >> GO TO 10.
NG >>
●If the voltage is approx. 5V when the blower fan is
ON: Replace the auto amp.
●If the voltage is approx. 0V when the blower fan is OFF: GO TO 17.
10.CHECK COMPRESSOR ON SIGNAL
OK or NG
OK >> GO TO 11.
NG >>
●If the voltage is approx. 5V when the A/C switch is
ON: Replace the auto amp.
●If the voltage is approx. 0V when the A/C switch is OFF.
–With gasoline engine: GO TO 18.
–With diesel engine: GO TO 13.
11 . CHECK MULTIPLEX COMMUNICATION CIRCUIT
Refer to ATC-109, "
Multiplex Communication Circuit" .
OK or NG
OK >> GO TO 12.
NG >> Repair harness or connector.
12.CHECK CAN CIRCUIT
Refer to CAN communication. EL-509, "CAN COMMUNICATION".
OK or NG
OK >> INSPECTION END.
NG >> Repair or replace malfunctioning part(s).
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M205 29 (LG/B) GroundBlower fan: ON Approx. 0V
Blower fan: OFF Approx. 5V
RJIA0797E
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M205 22 (L/R) GroundA/C SW: ON Approx. 0V
A/C SW: OFF Approx. 5V
RJIA0798E

ATC-80
TROUBLE DIAGNOSIS
13. CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND AUTO AMP. (WITH
DIESEL ENGINE)
Disconnect dual-pressure switch connector and auto amp. connec-
tor.
OK or NG
OK >> GO TO 14.
NG >> Repair harness or connector.
14. CHECK DUAL-PRESSURE SWITCH CIRCUIT (WITH DIESEL ENGINE)
Refer to AT C - 8 5 , "
Dual-Pressure Switch (With Diesel Engine)" .
OK or NG
OK >> GO TO 15.
NG >> Repair or replace malfunctioning part(s).
15. CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND COMBINATION
METER (WITH DIESEL ENGINE)
Disconnect combination meter connector.
OK or NG
OK >> GO TO 14.
NG >> Repair harness or connector.
16. CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND AUTO AMP.
Disconnect combination meter connector and auto amp. connector.
OK or NG
OK >> GO TO 11.
NG >> Repair harness or connector.
Terminal
Continuity (+) (-)
Dual–pres-
sure switch
connectorTe r m i n a l N o .
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
E51 1 (L/R) M205 22 (L/R) Yes
RJIA1699E
Terminal
Continuity (+) (-)
Dual-pres-
sure switch
connectorTe r m i n a l N o .
(Wire color)Combination
meter connec-
torTerminal No.
(Wire color)
E51 2 (P/U) M171 39 (PU) Yes
RJIA1700E
Terminal
Continuity (+) (-)
Combination
meter connec-
torTe r m i n a l N o .
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
M171 58 (BR/W) M204 18 (BR/W) Yes
RJIA1701E