2006 SUZUKI SX4 Ignition system

Downloaded from www.Manualslib.com manuals search engine 7B-54 Air Conditioning System: Automatic Type
DTC of A/C System detected by ECM
NOTE
When no DTC is detected, “FRE” [A] and “REC” [B] indicator lights on HVAC control module flash at
the same time in specific pattern.

Fail-Safe TableS6RW0D7224007
When any of the following malfunctions (DTCs) is detected, fail-safe mode is activated.
However, when HVAC control module detects normal operation of A/C system, fail-safe mode is canceled. DTC No. Detection itemDetecting condition
(DTC will set when detecting)MIL
P0481 Fan 2 Control Circuit
Refer to “Fail-Safe Table in Section 1A”. P0532A/C Refrigerant Pressure
Sensor Circuit Low
P0533A/C Refrigerant Pressure
Sensor Circuit High
H: ON a. About 3 seconds
L: OFF b. About 1 seconds
DTC No. Trouble AreaFail-Safe Operation
When ignition switch is turned ON
after malfunction is already detectedWhen malfunction is detected during
ignition switch is ON
) B1502Inside air temperature
sensor circuitHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that inside air temperature is
25 °C (77 °F).
) B1503A/C evaporator
temperature sensor
circuitHVAC control module assuming that
evaporator temperature is 0 °C (32 °F).• HVAC control module turns off A/C
switch signal.
• HVAC control module controls
actuators assuming that evaporator
temperature is 0 °C (32 °F).
) B1504 Sunload sensor circuitHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that amount of sunlight is 0 W/
m
2.
) B1520Temperature selector
malfunctionHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that setting of temperature
selector is 25 °C (77 °F) position.
) B1521Blower speed selector
malfunctionHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that setting of blower speed
selector is low (1st) position.
) B1522Air flow selector
malfunctionHVAC control module maintains last
normal value.HVAC control module controls actuators
assuming that setting of air flow selector
is DEF position.
[A]
[A]H
L
H
L [B]
[B]
baaba
baaba
I5RW0A722008-01

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Scan Tool DataS6RW0D7224008
As the data values given in the following are standard values estimated on the basis of values obtained from the
normally operation vehicles by using a scan tool, use them as reference values. Even when the vehicles are in good
condition, there may be cases where the checked values do not fall within each specifies data range. Therefore,
judgement as abnormal should not be made by checking with these data alone. ) B1551Serial communication
circuit• HVAC control module maintains last
normal value of outside air
temperature.
4 seconds after, HVAC control
module assuming that outside air
temperature is 20 °C (68 °F).
• HVAC control module maintains last
normal value of engine coolant
temperature.
4 seconds after, HVAC control
module assuming that engine
coolant temperature is 80 °C (176
°F).
• HVAC control module controls
actuators assuming that vehicle
speed is 40 km/h (25 mph).
• HVAC control module controls
actuators assuming that engine type
signal is J20.
• HVAC control module controls
actuators assuming that
combination meter spec signal is
US.HVAC control module controls actuators
assuming that outside air temperature is
20 °C (68 °F), engine coolant
temperature is 80 °C (176 °F), vehicle
speed is 40 km/h (25 mph), engine type
signal is J20 and combination meter spec
signal is US. ) B1552HVAC control module
check sum error
) B1553CAN communication
circuit
) B1557 VSS signal failureHVAC control module controls actuators assuming that vehicle speed is 40 km/h
(25 mph).
) B1561 ECT signal failureHVAC control module maintains last
normal value of engine coolant
temperature. 4 seconds after, HVAC
control module assuming that engine
coolant temperature is 80 °C (176 °F).HVAC control module controls actuators
assuming that engine
coolant temperature is 80 °C (176 °F).
) B1562Outside air
temperature signal
failureHVAC control module maintains last
normal value of outside air
temperature.
4 seconds after, HVAC control module
assuming that outside air temperature
is 20 °C (68 °F).HVAC control module controls actuators
assuming that outside air temperature is
20 °C (68 °F).
) B1570Engine type signal
failureHVAC control module controls actuators assuming that engine type signal is J20.
) B1571Combination meter
spec signal failureHVAC control module controls actuators assuming that combination meter spec
signal is US. DTC No. Trouble AreaFail-Safe Operation
When ignition switch is turned ON
after malfunction is already detectedWhen malfunction is detected during
ignition switch is ON
Scan Tool Data ConditionNormal Condition / Reference
Va l u e
) TEMP CONT
SWITCHIgnition switch turned ON and temperature selector
at maximum cool positionMAX Cool (Selected position of
temperature selector is displayed)
) CABIN
TEMPERATUREIgnition switch turned ON In-car temperature is displayed
) OUTSIDE AIR TEMP Ignition switch turned ON Outside air temperature is displayed
) EVAPORATOR
TEMPIgnition switch turned ON Evaporator temperature is displayed

Downloaded from www.Manualslib.com manuals search engine 7B-56 Air Conditioning System: Automatic Type
Scan Tool Data Definitions
TEMP CONT SWITCH: (Temperature control selector
position, Max Cool, °C / °F, Max Hot): This
parameter indicates the selected position of
temperature control selector.
CABIN TEMPERATURE: (In-car temperature, °C, °F):
This parameter indicates the in-car temperature
detected by inside air temperature sensor.OUTSIDE AIR TEMP (Outside air temperature, °C,
°F): This parameter indicates the outside air
temperature detected by outside air temperature
sensor.
EVAPORATOR TEMP (Evaporator temperature, °C,
°F): This parameter indicates the temperature of air
passed through evaporator.
COOLANT TEMP (Engine Coolant Temperature °C,
°F): This parameter indicates the engine coolant
temperature detected by engine coolant temperature
sensor. ) COOLANT TEMP
Ignition switch turned ONEngine coolant temperature is
displayed
) SUN LOAD Reference value depends on the situation 0 W/m
2 – 1988 W/m2
)MODE CONT
SWITCHIgnition switch turned ON and air flow selector at
AUTO positionAUTO (Selected position of air flow
selector is displayed)
) FAN CONT SWITCHIgnition switch turned ON and blower speed selector
at AUTO positionAUTO (Selected position of blower
speed selector is displayed)
) FAN DESIRED VOLTIgnition switch turned ON and blower speed selector
at HighApprox. 12.0 V
Ignition switch turned ON and blower speed selector
at LowApprox. 4.0 V
) AIR MIX POS SENIgnition switch turned ON and temperature selector
at maximum cool positionApprox. 0.5 V
Ignition switch turned ON and temperature selector
at maximum hot positionApprox. 4.5 V
)MODE POS SENSORIgnition switch turned ON and air flow selector at
DEF positionApprox. 4.5 V
Ignition switch turned ON and air flow selector at
VENT positionApprox. 0.5 V
) A/C CONT SIGA/C switch turned ON, blower speed selector at other
than OFF position with engine runningON
A/C switch turned OFF with engine running OFF
) BLOWER LOAD SIGIgnition switch turned ON, blower speed selector at
other than OFF positionON
Ignition switch turned ON, blower speed selector at
OFF positionOFF
) AIR INTAKE MODEIgnition switch turned ON and air intake selector at
fresh air (FRE) positionFRE
Ignition switch turned ON and air intake selector at
recirculation air (REC) positionREC
Ignition switch turned ON, air flow selector and
blower speed selector at AUTO positionAUTO
) REFRIGERANT
PRESSUREA/C ON (A/C is operating) with engine running at
ambient temperature 30 °C (86 °F)1130 – 1560 kPa (For details, refer to
pressure of high pressure gauge
under “A/C System Performance
Inspection”)
A/C OFF (A/C is not operating) with engine running
at ambient temperature 30 °C (86 °F) and engine
coolant temperature 90 °C (194 °F) – 100 °C (212
°F)600 – 1000 kPa after longer than 10
minute for A/C switch turned off
) A/C COMP CLUTCHA/C switch turned ON, blower speed selector at other
than OFF position with engine runningON
A/C switch turned OFF with engine running OFF
) VEHICLE SPEED At stop with ignition switch turned ON 0 km/h (0 mph)
) ENGINE TYPE Ignition switch turned ON Engine type is displayed.
) METER SPEC Ignition switch turned ONCombination meter spec is displayed. Scan Tool Data ConditionNormal Condition / Reference
Va l u e

Downloaded from www.Manualslib.com manuals search engine 7B-58 Air Conditioning System: Automatic Type
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
NOTE
When DTC B1503, B1504, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.

DTC Detecting Condition Trouble Area
Inside air temperature sensor signal voltage is higher than or lower than
specified value for specified time continuously.• Inside air temperature sensor circuit
• Inside air temperature sensor
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from inside air temperature
sensor and HVAC control module.
3) Check for proper connection to each signal circuit
terminal and ground circuit terminal of inside air
temperature sensor and HVAC control module
connectors.
4) If OK, check that inside air temperature sensor circuit is
as follows.
• Wiring harness resistance of each inside air
temperature sensor signal circuit and ground circuit is
less than 3 Ω
• Insulation resistance between inside air temperature
sensor signal circuit and vehicle body ground is
infinity
• Circuit voltage of each inside air temperature sensor
signal circuit and ground circuit is 0 – 1 V with ignition
switch turned ON
Are they in good condition?Go to Step 3. Inside air temperature
sensor signal circuit
and/or ground circuit are
open, short or high
resistance.
3Inside air temperature sensor reference voltage check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between signal terminal and ground
terminal of inside air temperature sensor connector.
Is voltage 4.5 – 5.5 V?Go to Step 4. Substitute a known-
good HVAC control
module and recheck.
4Inside air temperature sensor check
1) Check inside air temperature sensor for performance
referring to “Inside Air Temperature Sensor Inspection”.
Is it in good condition?Substitute a known-
good HVAC control
module and recheck.Replace inside air
temperature sensor.

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DTC B1503: Evaporator Temperature Sensor Circuit MalfunctionS6RW0D7224011
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
NOTE
When DTC B1502, B1504, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.

5V
G20
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 24 23 22 25 26 27 28 29 30
ORNORNWHT/BLKG20-9G20-24
[S]
[G] 2
31
I7RW01722005-01
[S]: Evaporator temperature sensor signal circuit 1. HVAC control module 3. To other sensors
[G]: Evaporator temperature sensor ground circuit 2. Evaporator temperature sensor
DTC Detecting Condition Trouble Area
Evaporator temperature sensor signal voltage is higher than or lower than
specified value for specified time continuously.• Evaporator temperature sensor
circuit
• Evaporator temperature sensor
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from evaporator temperature
sensor and HVAC control module.
3) Check for proper connection to each signal circuit
terminal and ground circuit terminal of evaporator
temperature sensor and HVAC control module
connectors.
4) If OK, check that evaporator temperature sensor circuit
is as follows.
• Wiring harness resistance of each evaporator
temperature sensor signal circuit and ground circuit is
less than 3 Ω
• Insulation resistance between evaporator temperature
sensor signal circuit and vehicle body ground is
Infinity
• Circuit voltage of each evaporator temperature sensor
signal circuit and ground circuit is 0 - 1 V with ignition
switch turned ON
Are they good condition?Go to Step 3. Evaporator temperature
sensor signal circuit
and/or ground circuit are
open, short or high
resistance.

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DTC B1504: Sunload Sensor Circuit MalfunctionS6RW0D7224012
Wiring Diagram
DTC Detecting Condition and Trouble Area
NOTE
When DTC B1502, B1503, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.

3Evaporator temperature sensor reference voltage check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between signal terminal and ground
terminal of evaporator temperature sensor connector.
Is voltage 4.5 – 5.5 V?Go to Step 4. Substitute a known-
good HVAC control
module and recheck.
4Evaporator temperature sensor check
1) Check evaporator temperature sensor for performance
referring to “Evaporator Temperature Sensor
Inspection”.
Is it in good condition?Substitute a known-
good HVAC control
module and recheck.Replace evaporator
temperature sensor. Step Action Yes No
G20
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 24 23 22 25 26 27 28 29 30
PNK
ORNORN
G20-25
G20-24
2
[S]
[G]15V
3
I7RW01722006-01
[S]: Sunload sensor signal circuit 1. HVAC control module 3. To other sensors
[G]: Sunload sensor ground circuit 2. Sunload sensor
DTC Detecting Condition Trouble Area
• Sunload sensor signal voltage is higher than or lower than specified value
for specified time continuously.
• Without sunlight• Sunload sensor circuit
• Sunload sensor
• HVAC control module

Downloaded from www.Manualslib.com manuals search engine Air Conditioning System: Automatic Type 7B-61
DTC Troubleshooting
DTC B1511: Temperature Control Actuator (Position Sensor) and/or Its Circuit MalfunctionS6RW0D7224013
Wiring DiagramStep Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from sunload sensor and HVAC
control module.
3) Check for proper connection to each signal circuit
terminal and ground circuit terminal of sunload sensor
and HVAC control module connectors.
4) If OK, check that sunload sensor circuit is as follows.
• Wiring harness resistance of each sunload sensor
signal circuit and ground circuit is less than 3 Ω
• Insulation resistance of each sunload sensor signal
circuit and ground circuit between sunload sensor
connector and vehicle body ground is Infinity
• Circuit voltage of each sunload sensor signal circuit
and ground circuit is 0 – 1 V with ignition switch turned
ON
Are they in good condition?Go to Step 3. Sunload sensor power
supply circuit and/or
signal circuit are open,
short or high resistance.
3Sunload sensor power supply voltage check
1) Connect connector to HVAC control module with ignition
switch turned OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between signal terminal and ground
terminal of sunload sensor connector.
Is voltage 4.5 – 5.5 V?Go to Step 4. Substitute a known-
good HVAC control
module and recheck.
4Sunload sensor check
1) Check sunload sensor for performance referring to
“Sunload Sensor Inspection”.
Is it in good condition?Substitute a known-
good HVAC control
module and recheck.Replace sunload
sensor.
G20
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16 17 18 19 20 21 24 23 22 25 26 27 28 29 30
GRY/BLUGRY/RED
5V5V
12V
ORN
WHT
YEL
G20-12
G20-27
G20-24
G20-1G20-2
2
[P]
[S]3
4
[G]
1
I6RW0C722004-01
[P]: Position sensor power supply circuit [G]: Position sensor ground circuit 2. Temperature control actuator 4. To other sensors
[S]: Position sensor signal circuit 1. HVAC control module 3. To air flow control actuator

Downloaded from www.Manualslib.com manuals search engine 7B-62 Air Conditioning System: Automatic Type
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
NOTE
• When DTC B1502, B1503, B1504 and B1512 are indicated together, it is possible that sensor ground
circuit is open.
• When DTC B1512 is indicated together, it is possible that position sensor power supply circuit is
open.

DTC Detecting Condition Trouble Area
Temperature control actuator position sensor signal voltage is higher than or
lower than specified value for specified time continuously.• Temperature control actuator circuit
• Temperature control actuator
• HVAC control module
Step Action Yes No
1Was “Air Conditioning System Check” performed?Go to Step 2. Go to “Air Conditioning
System Check”.
2Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from temperature control
actuator and HVAC control module.
3) Check for proper connection to position sensor power
supply, signal and ground circuit terminals of
temperature control actuator and HVAC control module
connectors.
4) If OK, check that position sensor of temperature control
actuator circuit is as follows.
• Wiring harness resistance of each position sensor
power supply, signal and ground circuit is less than 3
Ω
• Insulation resistance of each position sensor power
supply, signal and ground circuit is infinity between
temperature control actuator connector and vehicle
body ground
• Circuit voltage of each position sensor power supply,
signal and ground circuit is 0 - 1 V with ignition switch
turned ON
Are they in good condition?Go to Step 3. Position sensor power
supply, signal circuit
and/or ground circuit are
open, short or high
resistance.
3Position sensor of temperature control actuator power
supply voltage check
1) Connect connector to HVAC control module.
2) Turn ignition switch to ON position.
3) Measure voltage between.
• Position sensor power supply terminal and position
sensor ground terminal of temperature control
actuator connector
• Position sensor signal terminal and position sensor
ground terminal of temperature control actuator
connector
Is voltage 4.5 – 5.5 V?Go to Step 4. Go to Step 5.