IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO INSPECTION
EF & EC-27flowchartIdle Mixture Ratio Inspection Flowchart
1
A (continuation from previous page)
2
Run engine at about 2,000 rpm for about 2 minutes under no-load.
3
Make sure that inspection lamp (Green) on control unit goes on and off periodically more than 9 times during 10 seconds at 2,000 rpm under no-load. (Select mode I or II)
N.G.
B (goes to top-right, continues to another path)
B (goes to top-right, continues to another path)
Check exhaust gas sensor harness:
1) Turn off engine and disconnect battery ground cable.
2) Disconnect connector from Control Unit.
3) Disconnect exhaust gas sensor harness connector and connect terminal for exhaust gas sensor harness connector to ground with a jumping wire.
4) Check for continuity between terminal No. 29 and ground metal on vehicle body.
5) Connect Control Unit connector and battery ground cable.
Continuity exists ... O.K. / Continuity does not exist ... N.G.
O.K.
4
Race engine two or three times under no-load, then run engine at idle speed.
5
Set the diagnosis mode of E.C.U. to No. 2 mode and check that inspection lamps (Red and Green) on control unit blink at 2,000 rpm under no-load. They should blink simultaneously.
Yes
INSPECTION END
No
6
C (N.G. branch from n4 No path)
7
Check exhaust gas sensor harness:
1) Turn off engine and disconnect battery ground cable.
2) Disconnect connector from Control Unit.
3) Disconnect exhaust gas sensor harness connector and connect terminal for exhaust gas sensor harness connector to ground with a jumping wire.
4) Check for continuity between terminal No. 29 and ground metal on vehicle body.
5) Connect Control Unit connector and battery ground cable.
8
Continuity exists ... O.K. / Continuity does not exist ... N.G.
N.G.
Repair or replace E.C.C.S. harness.
Repair or replace E.C.C.S. harness.
B (right side continuation marker at bottom)
O.K.
9
• Disconnect engine temperature sensor harness connector.
• Connect a resistor (2.5 kΩ) between terminals of engine temperature sensor harness connector.
• Disconnect A.A.C. valve harness connector.
10
D (continues to next page)
11
B (right side continuation marker at bottom)