Suzuki 2006 SX4 Service Manual page 995

DTC No. Trouble Area
Serial communication
B1551
circuit
HVAC control module
B1552
check sum error
CAN communication
B1553
circuit
B1557 VSS signal failure
B1561 ECT signal failure
Outside air
B1562 temperature signal
failure
Engine type signal
B1570
failure
Combination meter
B1571
spec signal failure
Scan Tool Data
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.
Scan Tool Data
TEMP CONT
SWITCH
CABIN
TEMPERATURE
OUTSIDE AIR TEMP Ignition switch turned ON
EVAPORATOR
TEMP
When ignition switch is turned ON
after malfunction is already detected
• 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 vehicle speed is 40 km/h
(25 mph).
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 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 engine type signal is J20.
HVAC control module controls actuators assuming that combination meter spec
signal is US.
Condition
Ignition switch turned ON and temperature selector
at maximum cool position
Ignition switch turned ON
Ignition switch turned ON
Air Conditioning System: Automatic Type 7B-55
Fail-Safe Operation
When malfunction is detected during
ignition switch is ON
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.
HVAC control module controls actuators
assuming that engine
coolant temperature is 80 °C (176 °F).
HVAC control module controls actuators
assuming that outside air temperature is
20 °C (68 °F).
Normal Condition / Reference
MAX Cool (Selected position of
temperature selector is displayed)
In-car temperature is displayed
Outside air temperature is displayed
Evaporator temperature is displayed
S6RW0D7224008
Value