Engine General Information and Diagnosis: 1A-48
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 ( )
Is the continuity OK?
Go to Step 3. B/Bl or B/Br wire open.
Step Action Yes No
I718H1110174-02
“A”
“B”
“10”
(A)
(B)
“29”
I718H1110051-02
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