Engine General Information and Diagnosis: 1A-84
2 3) Disconnect the STP sensor coupler.
4) Check the continuity between the Y/W wire and ground.
Also, check the continuity between the Y/W wire and B/
Br wire.
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 ( )
5) Disconnect the ECM coupler. Refer to “ECM Removal
and Installation in Section 1C (Page 1C-1)”.
6) Check the continuity between the Y/W wire “A” and
terminal 20. Also, check the continuity between the R
wire “C” and terminal 11.
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. R or Y/W wire open, or
Y/W wire shorted to the
ground.
Step Action Yes No
(A)
I718H1110092-03
“A”
“11”
“20”
(A)
(B)
“C”
I718H1110093-02
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