Suzuki WagonR+ RB310 Service Manual page 1841

6-1-78 GENERAL INFORMATION AND ENGINE DIAGNOSIS
Fig. 1 for Step 1
DTC P0480 RADIATOR FAN CONTROL SYSTEM MALFUNCTION
CIRCUIT DESCRIPTION
Main
fuse
"FI"
DTC DETECTING CONDITION
D Low voltage at terminal E21-20 when engine coolant
temp. is below 91_C, 195_F.
2 driving cycle detection logic, continuous monitoring.
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Warm up engine until radiator cooling fan starts to operate.
4) Check pending DTC in "ON BOARD TEST" or "PENDING DTC" mode and DTC in "DTC" mode.
Radiator fan relay
To other circuits
Main relay
Radiator
fan motor
M
POSSIBLE CAUSE
D "BLK/RED" or "BLU" circuit open or short
D Radiator fan relay malfunction
D ECM (PCM) malfunction