Reception Data Check From Bcm; Dtc Check Of Hvac Control Module; A/C Switch Signal Circuit Check; Dtc Check Of Ect Sensor Circuit - Suzuki GRAND VITARA JB416 Service Manual

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 reception data from BCM.
Is there DTC P1678?
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 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 Radiator cooling fan control system check
Is radiator cooling fan started when A/C and blower speed
selector switch are turned ON with engine running?
6 Radiator cooling fan control circuit check
1) Check DTC with scan tool.
Is DTC P0480 displayed?
7 Evaporator temperature sensor check
1) Check evaporator temperature sensor referring to "A/C
Evaporator Temperature Sensor Inspection: in Section
7B in related manual".
Is resistance within specification?
8 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?
9 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?
10 Radiator cooling fan check
1) Check radiator cooling fan referring to "Radiator Cooling
Fan Motor On-Vehicle Inspection: in Section 1F in
related manual".
Is check result satisfactory?
Action
Engine General Information and Diagnosis:
Yes
Go to applicable DTC
diag. flow.
Go to applicable DTC
diag. flow.
Go to Step 4.
Go to applicable DTC
diag. flow.
Go to Step 11.
Go to "DTC P0480: Fan
1 (Radiator Cooling
Fan) Control Circuit: in
related manual".
Go to Step 8.
Go to applicable DTC
diag. flow.
Go to Step 10.
Radiator cooling fan
drive circuit malfunction.
If circuit is OK, go to
Step 7.
1A-69
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.
Faulty evaporator
temperature sensor.
Go to Step 9.
Check amount of
refrigerant. If OK,
replace A/C refrigerant
pressure sensor.
Replace radiator cooling
fan motor.