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Transcript
Carman scanFor EMS PROfesor
1.14.3 O2 Sensor Heater Operation Trouble type and Analysis
Malfunction of O2 sensor heater
Trouble
1. Malfunction of valve operation
(Power supply line is no problem but O2 sensor is not heated)
2. O2 sensor is not activated (Always OFF)
Cause of
trouble
1. O2 sensor heater damage
2. Wiring circuit failure (Power supply or Ground line open or shorted)
Engine
state
1,2 O2 sensor signal switching is too slow (Too slow light off)
Intermittently exhaust gas is black and poor acceleration is detected and
engine stall is occurred when fast acceleration. Fuel economy is bad.
Normal
signal
Signal
wave when
trouble
detection
O2 sensor heater should be always “ON” if after
start time is elapsed 40 sec
(In case of duty type, it is “ON” above 95%)
1. Always constant
If O2 sensor heater signal is “OFF”
when idle, error is detected.
64