Engine General Information and Diagnosis: 1A-127
8 Radiator cooling fan control No. 1 check
1) Run engine until ECT is over 97.5 °C, 207.5 °F.
2) Measure voltage between vehicle body ground and
“E23-46” terminal of ECM connector.
Is voltage lower than 1.5 V?
Go to Step 9. Faulty ECM.
Substitute a known-
good ECM and recheck.
9 Radiator cooling fan control check
1) Disconnect radiator cooling fan relay No. 2 (2) and No. 3
(3) from individual circuit fuse box No.1 (1) with ignition
switch turned OFF.
2) Run engine until ECT is over 97.5 °C, 207.5 °F.
3) Measure voltage between vehicle body ground and each
“BLU/RED” wire terminal of radiator cooling fan control
relay No. 2 and No. 3 connectors.
Is voltage 10 – 14 V?
Go to Step 10. “BLU/RED” wire is open
circuit.
10 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Connect radiator cooling fan relay No. 2 to individual
circuit fuse box No.1.
3) Using service wire, ground “E23-46” and “E23-60”
terminals of ECM connector.
4) Turn ON ignition switch, measure voltage between
vehicle body ground and “E23-48” terminal of ECM
connector.
Is voltage 10 – 14 V?
Go to Step 11. Go to Step 12.
11 Wire circuit check
1) Disconnect radiator cooling fan relay No. 2 and then
connect radiator cooling fan relay No. 3 to individual
circuit fuse box No.1 with ignition switch turned OFF.
2) Turn ON ignition switch, measure voltage between
vehicle body ground and “E23-48” terminal of ECM
connector.
Is voltage 10 – 14 V?
Go to Step 15. Go to Step 12.
Step Action Yes No
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I7RS0A110011-01
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