Engine General Information and Diagnosis: 1A-50
2 1) Turn the ignition switch OFF.
2) Check the ECT sensor coupler for loose or poor
contacts.
If OK, then check the ECT sensor lead wire continuity.
3) Disconnect the ECT coupler.
4) Disconnect the ECM coupler. Refer to “ECM Removal
and Installation in Section 1C (Page 1C-1)”.
5) Insert the needle pointed probes to the lead wire coupler.
6) Check the continuity between the B/Bl wire “A” and
terminal 10. Also, check the continuity between the B/Br
wire “B” and terminal 29.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity test ( )
ECM coupler (Harness side)
Is the continuity OK?
Go to Step 3. B/Bl or B/Br wire open.
Step Action Yes No
I717H1110014-01
“A”
“B”
“10”
(A)
(B)
“29”
I718H1110051-02
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