1A-57 Engine General Information and Diagnosis:
2 4) Disconnect the IAP sensor coupler.
5) Insert the needle pointed probes to the lead wire coupler.
6) Check the continuity between the R and G/B wire.
If the sound is not heard from the tester, the circuit
condition is OK.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity ( )
7) Disconnect the ECM coupler. Refer to “ECM Removal
and Installation in Section 1C (Page 1C-1)”.
8) Check the continuity between the G/B wire “C” and
terminal 9.
If OK, then 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 ( )
ECM coupler (Harness side)
Is the continuity OK?
Go to Step 4. W/Bl wire shorted to
Vcc, or B/Br wire open.
Step Action Yes No
(B)
(A)
I718H1110023-03
(B)
“B”
“C”
“9”
“29”
(A)
I718H1110182-02
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