Trouble Diagnoses — Diagnostic Procedure 3 — Unstable Idle (Cont'd)

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Check exhaust gas sensor. Run engine at approximately 2,000 rpm after warm-up. Conduct "MIXTURE Ratio" test with "FUNCTION TEST" showing on display or proceed as follows: Select "EXH GAS SEN" with "DATA MONITOR" showing on display. Run engine at 2,000 rpm under no load after warm-up. Check to ensure display alternately shows "LEAN" and "RICH" at least 5 times within 10 seconds. RICH->LEAN->RICH->LEAN->RICH... (<- 1 time -> <- 2 times ->). (Without CONSULT: Set body-side diagnostic connector (inside fuse box) in "EXH GAS SEN" mode. (Refer to "Self-Diagnosis".) Run engine at 2,000 rpm under no load after warm-up. Check to ensure RED L.E.D. on E.C.U. flashes at least 5 times within 10 seconds.)

Check air intake for leaks. Start engine. Check to ensure engine speed increases when blow-by hose is pinched with fingers.

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