Oxygen Sensor - Mazda 626 MX-6 Workshop Manual

S E LF-D IA G N O S IS C H E C K E R
M O NITO R
O
J$r
O O O
O
49 M 0 I8 9AI
Monitor lamp

OXYGEN SENSOR

Inspection of Output Voltage
1. Warm up the engine and run it at idle.
2. Disconnect the oxygen sensor connector.
3. Connect a voltmeter between the oxygen sensor
and ground.
4. Run the engine at 4,500 rpm until the voltmeter
indicates approx. 0.7V.
%
86U04A-205
5. Increase and decrease the engine speed suddenly
several times. Check to see that when the speed
is increased the meter reads between 0.5V—1 .OV,
and when the speed is decreased it reads between
OV—0.4V
6. If the voltmeter dosen't indicate as specified, re­
place the oxygen sensor.
86U04A-206
Inspection of Sensitivity
1. Warm up the engine to the normal operating tem­
perature and run it at idle.
2. Connect the SST to the check connector.
4 9 H 0 1 8 9A 1
86U04A-207
3. Increase the engine speed to between 2,000 and
3,000 rpm, and check that the monitor lamp flash­
es for 10 seconds.
Monitor lamp: Flashes ON and OFF
S E L E C T SW
A
86U04A-208
CONTROL SYSTEM
more than 8 times/10 sec
4B
4B -117