Trouble Diagnoses — Diagnostic Procedure 8 (Cont'd)
EF & EC-97flowchartDiagnostic Procedure 8 (Cont'd)
1
INSPECTION START
2
CHECK INPUT SIGNAL.
1) Start engine and warm it up sufficiently.
2) Make sure green L.E.D. on E.C.U. blinks at 2,000 rpm.
O.K.
INSPECTION END
N.G.
3
CHECK EXHAUST GAS SENSOR CIRCUIT.
1) Turn off engine.
2) Disconnect E.C.U. harness connector.
3) Disconnect exhaust gas sensor harness connector.
4) Connect a jumper wire from exhaust gas sensor harness connector terminal (b) to ground.
5) Check resistance between E.C.U. terminal (29) and ground.
Resistance: Approximately 0Ω
N.G.
Repair or replace harness.
O.K.
4
CHECK EXHAUST GAS SENSOR HEATER CIRCUIT.
Check resistance between terminals (a) and (115).
Resistance: Approximately 0Ω
N.G.
same as step 3
O.K.
5
CHECK POWER SOURCE.
1) Turn ignition switch "ON".
2) Check voltage between terminal (c) and ground.
Voltage: Battery voltage
N.G.
1) Check fuse.
1) Check fuse.
2) Check middle harness connector for proper connection.
O.K.
6
Replace exhaust gas sensor.
7
Reinstall any part removed.
8
1) Warm up engine sufficiently.
2) Set diagnosis mode to Mode I.
3) Make sure that inspection lamp (Green) on E.C.U. goes on and off periodically more than 9 times during 10 seconds at 2,000 rpm.
N.G.
Perform IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO INSPECTION.
Perform IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO INSPECTION.
(See page EF & EC-25.)
O.K.
INSPECTION END