CITROEN C1 - Page 108

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INJECTION
OPERATING PHASES : BOSCH ME 7.9.5 INJECTION SYSTEM
EOBD diagnostic function
EOBD : European On Board Diagnosis, for diagnosis of depollution equipment.
This diagnosis informs the driver if the depollution equipment is no longer fulfilling its role.
The on-board diagnosis system monitors :
- Elements of the injection system (polluting emissions, destruction of the catalytic converter)
- The efficiency of the catalytic converter
K : Catalytic converter in good condition.
L : Catalytic converter in poor condition.
"a" : Upstream oxygen sensor.
"b" : Downstream oxygen sensor.
The efficiency of the catalytic converter is determined by comparing the signals coming from the ups-
tream and downstream oxygen sensors.
The detection is performed 6 minutes after the starting of the engine.
Conditions of detection :
- Engine operating for at least 6 minutes
- No fault in the oxygen sensors (downstream oxygen sensor, upstream oxygen sensor)
- No combustion misfirings
Outside the fixed limit, a fault is recorded in the injection ECU and the diagnostic warning lamp comes
on.
B1H2029D
Engine : CFA
FR-C1-page93-125-2005 9/01/06 8:51 Page 102