Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 287

6-1-146 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE)
Step
1 A/C Condenser Fan Motor Control Circuit check
1) Remove ECM (PCM) cover.
2) Measure voltage between E61-5 and vehi-
cle body ground with ignition turned ON.
Is voltage 10 – 14 V?
2 A/C Condenser Fan Motor Control Circuit check
1) Turn OFF ignition switch.
2) Check for fuse blow at "HTR 15 A" fuse.
3) If OK, check A/C condenser fan motor relay
referring to "A/C Compressor Relay and
Condenser Fan Motor Relay" in Section
6E2.
Is check result as specified?
3 A/C Condenser Fan Motor Control Signal check
1) Start engine.
2) Turn ON A/C switch and heater blower
motor switch.
3) Measure voltage between E61-5 and vehi-
cle body ground with engine running.
Is voltage 0 – 1 V?
4 A/C Condenser Control Circuit check
1) Turn OFF ignition switch.
2) Check for fuse blow at "A/C 25 A" fuse.
3) If OK, check A/C Condenser fan motor relay
referring to "A/C Compressor Relay and
Condenser Fan Motor Relay" in Section
6E2.
Is check result as specified?
5 A/C Switch Signal check
1) Turn ON A/C switch and heater blower
motor switch.
2) Measure voltage between E61-28 and vehi-
cle body ground with ignition switch turned
ON.
Is voltage 0 – 1 V?
Action Yes
Go to Step 3.
"YEL/GRN" wire or "YEL/
BLU" wire is open circuit.
Go to Step 4.
"RED/BLK" wire or "RED/
BLU" wire is open circuit.
If wire circuits are OK,
check A/C condenser fan
motor referring to "A/C
Condenser Fan Assem-
bly" in Section 1B.
Substitute a known-good
ECM (PCM) and recheck.
No
Go to Step 2.
Faulty A/C condenser fan
motor relay.
Go to Step 5.
Faulty A/C condenser fan
motor relay.
Faulty "GRN/BLK" wire, A/
C evaporator temperature
is below 2.5°C, 36.5°F,
faulty refrigerant pressure
switch or faulty A/C sys-
tem referring to "HVAC
Control Module" in Sec-
tion 1B.