6-2-80 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
7 Check ECT sensor ground circuit.
1) Connect connectors to ECM.
2) Check for proper connection of ECT sensor
connector at “BRN/WHT” wire terminal.
3) Measure resistance between “BRN/WHT”
wire terminal of ECT sensor connector and
vehicle body ground.
Is resistance below 5
Ω
?
Go to Step 9. Go to Step 8.
8 Check ECT sensor ground circuit.
1) Measure resistance between “E22-28” ter-
minal of ECM connector and vehicle body
ground.
Is resistance below 5
Ω
?
“BRN/WHT” wire open cir-
cuit or high resistance cir-
cuit.
Poor “E22-28” connection.
Faulty ECM ground cir-
cuit.
If circuit are OK, substi-
tute a known-good ECM
and recheck.
9 Check ECT sensor according to “Engine Cool-
ant Temperature Sensor (ECT Sensor) Inspec-
tion” in Section 6E2.
Is it in good condition?
Substitute a known-good
ECM and recheck.
Replace ECT sensor.
Step Action Yes No
[A]: Fig. 1 for Step 3
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