1A-147 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed?
Go to Step 2. Go to “Engine and
Emission Control
System Check: ”.
2 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection to ECM at “E23-46”, “E23-
47” and “E23-48” terminals.
3) If OK, turn ON ignition switch.
4) Measure voltage between “E23-46” terminal of ECM
connector and vehicle body ground.
Is voltage 10 – 14 V?
Go to Step 3. Go to Step 4.
3 Radiator cooling fan control No.1 check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Run engine until ECT is over 97.5 °C 207.5 °F.
3) Measure voltage between “E23-46” terminal of ECM
connector and vehicle body ground.
Is voltage below 1.5 V?
Go to Step 8. Substitute a known-
good ECM and recheck.
4 Wire circuit check
1) Disconnect radiator cooling fan relay No.1 (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.1 connector and vehicle
body ground.
Is voltage 10 – 14 V?
Go to Step 5. “YEL/GRN” wire is open
circuit.
5 Wire circuit check
1) Measure resistance between “RED/BLK” wire terminal of
radiator cooling fan relay No.1 connector and vehicle
body ground with ignition switch turned OFF.
Is resistance infinity?
Go to Step 6. “RED/BLK” wire is
shorted to ground
circuit.
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