1A-73 Engine General Information and Diagnosis:
1 4) Disconnect the TO sensor coupler.
5) Check the continuity between the B wire “B” and ground.
Also, check the continuity between the B wire “B” and B/
Br wire “C”. If the sound is not heard from the tester, the
circuit condition is OK.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Continuity test ( )
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 R wire “A” and
terminal 11. Also, then check the continuity between B
wire “B” and terminal 22.
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. R or B wire open, or B
wire shorted to the
ground.
Step Action Yes No
“B”
(A)
“C”
I718H1110073-02
“A”
“B”
“11”
(A)
(B)
“22”
I718H1110074-02
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