Suzuki 2006 SX4, Service Manual

Page: 205 / 1478

Engine General Information and Diagnosis: 1A-161
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 Action Yes No
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?
Go to “Troubleshooting
for CAN-DTC”. Go to Step 2.
2 DTC check of HVAC control module
1) Check HVAC control module for DTC.
Is there DTC(s)?
Go to applicable DTC
diag. flow. Go to Step 3.
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?
Go to Step 4. Check HVAC control
module and its circuit.
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?
Go to applicable DTC
diag. flow. Go to Step 5.
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?
Go to Step 11. Go to Step 6.
6 A/C condenser cooling fan control circuit check
1) Check DTC with scan tool.
Is DTC P0481 displayed?
Go to “DTC P0481: Fan
2 Control Circuit”. Go to Step 7.
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?
Go to applicable DTC
diag. flow. Go to Step 8.
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?
Go to Step 9. Check amount of
refrigerant. If OK,
replace A/C refrigerant
pressure sensor.