1A-57 Engine General Information and Diagnosis:
Step Action Yes No
1 4) Remove the TO sensor.
5) Disconnect the TO sensor coupler.
6) Insert the needle pointed probes to the lead wire coupler.
7) Check the continuity between Br/W wire “B” and ground.
Also, check the continuity between Br/W wire “B” and B/
Br wire “C”. If sound is not heard from the tester, the
circuit condition is OK.
8) Disconnect the ECM coupler. Refer to “ECM Removal
and Installation in Section 1C (Page 1C-1)”.
9) Check the continuity between R wire “A” and terminal
“6”.
Also, then check the continuity between Br/W wire “B”
and terminal “10”.
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 2. R or B wire open, or Br/
W wire shorted to the
ground.
(A)
“B”
“C”
I831G1110084-01
“A”
“B”
(A)
(B)
“10”
“6”
I831G1110085-02
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