E.C.C. TROUBLE DIAGNOSES (Models with catalyzer and E.G.R.) — Diagnostic Procedure 5 (Cont'd)

INSPECTION START

A: CHECK OVERALL FUNCTION. 1) Start engine and warm it up sufficiently. 2) Run engine at about 2,500 rpm for about 5 minutes under no-load. 3) Keep engine speed at 2,000 rpm under no-load, check voltage between terminal (d) and terminal (l) on check connector. Needle of voltmeter should fluctuate between approximately 0V and battery voltage more than 5 times during 10 seconds.

B: CHECK HARNESS CONTINUITY BETWEEN E.C.U. AND CHECK CONNECTOR. 1) Stop engine. 2) Disconnect E.C.U. harness connector. 3) Check harness continuity between E.C.U. terminal (8) and terminal (d), terminal (l) and body ground. Continuity should exist.

C: CHECK INPUT SIGNAL CIRCUIT. 1) Disconnect exhaust gas sensor harness connector. 2) Check harness continuity between E.C.U. terminal (21) and terminal (a) (Harness side connector (E61)). Continuity should exist.

CHECK COMPONENT (Exhaust gas sensor). Refer to "Electrical Components Inspection". (See page EF & EC-148.)