Self-diagnosis — Mode II (Exhaust gas sensor monitor — Models with catalyzer only)

EF & EC-416prose procedure

Applies to models with catalyzer only.

TROUBLE DIAGNOSES

Self-diagnosis — Mode II (Exhaust gas sensor monitor — Models with catalyzer only)

DESCRIPTION

In this mode, the CHECK ENGINE LIGHT and RED L.E.D. display the condition of the fuel mixture (lean or rich) which is monitored by the exhaust gas sensor.

Mode II — Exhaust Gas Sensor Monitor

CHECK ENGINE LIGHT and RED L.E.D.	Fuel mixture condition in the exhaust gas	Air fuel ratio feedback control condition
ON	Lean	Closed loop control
OFF	Rich	Closed loop control
*Remains ON or OFF	Any condition	Open loop control

Fuel mixture condition in the exhaust gasLean

Air fuel ratio feedback control conditionClosed loop control

OFF

Fuel mixture condition in the exhaust gasRich

Air fuel ratio feedback control conditionClosed loop control

*Remains ON or OFF

Fuel mixture condition in the exhaust gasAny condition

Air fuel ratio feedback control conditionOpen loop control

NOTE

*: Maintains conditions just before switching to open loop.

How to Check Exhaust Gas Sensor

1
Set Mode II. (Refer to "HOW TO SWITCH MODES".)
2
Start engine and warm it up until engine coolant temperature indicator points to the middle of the gauge.
3
Run engine at about 2,000 rpm for about 2 minutes under no-load conditions.
4
Make sure RED L.E.D. or CHECK ENGINE LIGHT goes ON and OFF more than 5 times every 10 seconds; measured at 2,000 rpm under no-load.

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Self-diagnosis — Mode II (Exhaust gas sensor monitor — Models with catalyzer only)

TROUBLE DIAGNOSES