1A-74 Engine General Information and Diagnosis:
1 6) Disconnect the ECM coupler. Refer to “ECM Removal
and Installation in Section 1C (Page 1C-1)”.
7) Insert the needle pointed probes to the lead wire coupler.
8) Check the continuity between the B wire and terminal
“31”. Also, check the continuity between B/Br wire and
terminal “35”.
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 2. B wire shorted to VCC,
or B/Br wire open.
Step Action Yes No
(Black)
(Gray)
?
(A)
(B)
“31”
“35”
I837H1110051-01
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