1A-149 Engine General Information and Diagnosis:
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?
Go to Step 13.
“RED” wire is shorted to
other circuit.
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
Ω
?
Go to Step 20.
“RED” wire is open
circuit.
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?
Go to Step 15.
Go to Step 16.
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?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
Substitute a known-
good ECM and recheck.
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?
Go to Step 17.
“YEL/GRN” wire is open
circuit.
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?
Go to Step 18.
“RED/YEL” wire is
shorted to ground
circuit.
Step
Action
Yes
No
1
2
I5JB0A110059-02
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