Dtc B1557: Vss Signal Failure; Dtc B1561: Ect Signal Failure - Suzuki 2006 SX4 Service Manual

DTC B1557: VSS Signal Failure

DTC Detecting Condition and Trouble Area
HVAC control module receives invalid data of VSS signal from BCM.
DTC Troubleshooting
Step
1 Was "Air Conditioning System Check" performed?
2 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check DTC in ECM.
Is DTC P0500 detected?

DTC B1561: ECT Signal Failure

DTC Detecting Condition and Trouble Area
HVAC control module receives invalid data of ECT signal from BCM.
DTC Troubleshooting
Step
1 Was "Air Conditioning System Check" performed?
2 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check DTC in ECM.
Is DTC P0116, P0117 or P0118 detected?
DTC detecting condition
Action
DTC detecting condition
Action
Air Conditioning System: Automatic Type 7B-73
• VSS circuit
• VSS
• HVAC control module
Yes
Go to Step 2.
Go to applicable DTC
diag flow.
• ECT sensor circuit
• ECT sensor
• HVAC control module
Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
S6RW0D7224023
Trouble area
No
Go to "Air Conditioning
System Check".
Substitute a known-
good HVAC control
module and recheck.
S6RW0D7224024
Trouble area
No
Go to "Air Conditioning
System Check".
Substitute a known-
good HVAC control
module and recheck.