Suzuki 2006 SX4 Service Manual page 205

Troubleshooting
NOTE
• Before performed troubleshooting, be sure to read the "Precautions of ECM Circuit Inspection".
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to "Inspection of ECM and Its Circuits".
• When A/C evaporator outlet air temp. is below 2 °C (35.6 °F), A/C remains OFF ("E01-49" terminal
voltage becomes 10 – 14 V). This condition is not abnormal.
Step
1 Reception data check from BCM
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check DTC for CAN-DTC.
Is there any CAN-DTC?
2 DTC check of HVAC control module
1) Check HVAC control module for DTC.
Is there DTC(s)?
3 A/C switch signal circuit check
1) Start engine and select "Data List" mode on scan tool.
2) Check A/C switch signal under the following conditions
respectively.
A/C switch signal
Engine running, A/C switch OFF: OFF
Engine running, A/C switch ON and blower speed
selector turned 1st position or more: ON
Is check result satisfactory?
4 DTC check of ECT sensor circuit
1) Check ECM for DTC of ECT sensor circuit.
Is there DTC P0116, DTC P0117 or DTC P0118?
5 A/C condenser cooling fan control system check
Is A/C condenser cooling fan started when A/C and blower
speed selector switch are turned ON with engine running?
6 A/C condenser cooling fan control circuit check
1) Check DTC with scan tool.
Is DTC P0481 displayed?
7 DTC check of A/C refrigerant pressure sensor circuit
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check ECM for DTC of A/C refrigerant pressure sensor
circuit.
Is there DTC P0532 or DTC P0533?
8 A/C refrigerant pressure sensor voltage check
1) Check A/C refrigerant pressure sensor voltage referring
to "Inspection of ECM and Its Circuits".
Is voltage within specified value?
Action
Engine General Information and Diagnosis:
Yes
Go to "Troubleshooting
for CAN-DTC".
Go to applicable DTC
diag. flow.
Go to Step 4.
Go to applicable DTC
diag. flow.
Go to Step 11.
Go to "DTC P0481: Fan
2 Control Circuit".
Go to applicable DTC
diag. flow.
Go to Step 9.
1A-161
No
Go to Step 2.
Go to Step 3.
Check HVAC control
module and its circuit.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
Check amount of
refrigerant. If OK,
replace A/C refrigerant
pressure sensor.