1A-98 Engine General Information and Diagnosis:
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Remove the air cleaner box. Refer to “Air Cleaner Box
Removal and Installation in Section 1D (Page 1D-7)”.
3) Check the ISC valve coupler (1) for loose or poor
contacts.
If OK, then check the ISC valve lead wire continuity.
4) Disconnect the ISC valve coupler and ECM coupler.
Refer to “ECM Removal and Installation in Section 1C
(Page 1C-1)”.
5) Check the continuity between terminal “A” and terminal
“38”, terminal “B” and terminal “37”, terminal “C” and
terminal “39”, terminal “D” and terminal “49”.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity test ( )
ECM couplers (Harness side)
Is the continuity OK?
Go to Step 2. Bl, Y, G or Br wire open.
1
I837H1110138-01
(A)
(B)
“A”
“C”
“D”
“B”
“37”
“38”
“39”
“49”
I837H1110080-02
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