Suzuki GRAND VITARA Owner's Manual page 203

Step
6 Wire circuit check
1) Measure voltage between "RED/BLK" wire terminal of
radiator cooling fan relay No.1 connector and vehicle
body ground with ignition switch turned ON.
Is voltage 0 V?
7 Wire circuit check
1) Measure resistance between "RED/BLK" wire terminal of
radiator cooling fan relay No.1 connector and "E23-46"
terminal of ECM connector with ignition switch turned
OFF.
Is resistance below 2
8 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure voltage between "E23-47" terminal of ECM
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 10 – 14 V?
9 Radiator cooling fan control No.2 check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Run engine until ECT is over 102.5 °C, 216.5 °F.
3) Measure voltage between "E23-47" terminal of ECM
connector and vehicle body ground.
Is voltage below 1.5 V?
10 Wire circuit check
1) Disconnect radiator cooling fan relay No.2 (1) from relay
box (2) with ignition switch turned OFF.
2) Turn ON ignition switch.
3) Measure voltage between "YEL/GRN" wire terminal of
radiator cooling fan relay No.2 connector and vehicle
body ground.
Is voltage 10 – 14 V?
11 Wire circuit check
1) Measure resistance between "RED" wire terminal of
radiator cooling fan relay No.2 connector and vehicle
body ground with ignition switch turned OFF.
Is resistance infinity?
Action
Ω
?
2
1
Engine General Information and Diagnosis:
Yes
Go to Step 7.
Go to Step 20.
Go to Step 9.
Go to Step 14.
Go to Step 11.
I5JB0A110058-02
Go to Step 12.
1A-148
No
"RED/BLK" wire is
shorted to other circuit.
"RED/BLK" wire is open
circuit.
Go to Step 10.
Substitute a known-
good ECM and recheck.
"YEL/GRN" wire is open
circuit.
"RED" wire is shorted to
ground circuit.