Trouble Diagnoses - Diagnostic Procedure 31 (Cont'd)
EF & EC-591flowchartDiagnostic Procedure 31 (Cont'd)
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INSPECTION START
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A - CHECK EXHAUST GAS SENSOR CIRCUIT. 1) Start engine and warm it up sufficiently. 2) Make sure that "M/R F/C MNT" in "DATA MONITOR" mode indicates "RICH" and "LEAN" periodically more than 5 times during 10 seconds at 2,000 rpm.
O.K.
INSPECTION END
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OR - 1) Start engine and warm it up sufficiently. 2) Run engine at about 2,000 rpm for about 2 minutes under no-load. 3) Set E.C.U. diagnosis mode to Mode II. 4) Keep engine speed at 2,000 rpm and make sure that the RED L.E.D. on E.C.U. or the check engine light on the instrument panel goes on and off more than 5 times during 10 seconds.
N.G.
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B - CHECK POWER SUPPLY. 1) Stop engine. 2) Disconnect exhaust gas sensor harness connector. 3) Turn ignition switch "ON". 4) Check voltage between terminal 6 and ground. Voltage: Battery voltage
N.G.
Check the following. - Harness connectors M11, M104 - 10A fuse - Harness continuity between exhaust gas sensor and fuse. If N.G., repair harness or connectors.
O.K.
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C - CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Check harness continuity between terminal 4 and body ground. Continuity should exist.
N.G.
Check the following. - Harness connectors C54, M250 - Harness continuity between exhaust gas sensor and body ground. If N.G., repair harness or connectors.
O.K.
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