Suzuki GRAND VITARA Owner's Manual page 204

1A-149 Engine General Information and Diagnosis:
Step
12 Wire circuit check
1) Measure voltage between "RED" wire terminal of
radiator cooling fan relay No.2 connector and vehicle
body ground with ignition switch turned ON.
Is voltage 0 V?
13 Wire circuit check
1) Measure resistance between "RED" wire terminal of
radiator cooling fan relay No.2 connector and "E23-47"
terminal of ECM connector with ignition switch turned
OFF.
Is resistance below 2
14 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure voltage between "E23-48" terminal of ECM
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 10 – 14 V?
15 Radiator cooling fan control No.3 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 "E23-48" terminal of ECM
connector and vehicle body ground.
Is voltage below 1.5 V?
16 Wire circuit check
1) Disconnect radiator cooling fan relay No.3 (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.3 connector and vehicle
body ground.
Is voltage 10 – 14 V?
17 Wire circuit check
1) Measure resistance between "RED/YEL" wire terminal of
radiator cooling fan relay No.3 connector and vehicle
body ground with ignition switch turned OFF.
Is resistance infinity?
Action
Ω
?
1
2
Yes
Go to Step 13.
Go to Step 20.
Go to Step 15.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
Go to Step 17.
I5JB0A110059-02
Go to Step 18.
No
"RED" wire is shorted to
other circuit.
"RED" wire is open
circuit.
Go to Step 16.
Substitute a known-
good ECM and recheck.
"YEL/GRN" wire is open
circuit.
"RED/YEL" wire is
shorted to ground
circuit.