Advertisement
Electrical system
In closed loop, the value must be close to 1.00 (values not within the 0.90 - 1.10 interval indicate a fault):
for example, value 0.75 corresponds to +25% with respect to the reference injection time; 1.25 corre-
sponds to -25%. In an open circuit, the oxygen sensor signal is too low. Therefore, the control unit takes
it as a lean combustion condition and will try to enrich it. The value read will be 0.75: once this correction
has been tried, the value shifts to 1.00 fixed and the Lambda probe error is signalled.
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING, CAREFULLY READ THE GENERAL TROU-
BLESHOOTING CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGINNING OF THE CHECK
AND CONTROL SECTION IN THE ELECTRICAL SYSTEM CHAPTER.
DIAGNOSTICS INSTRUMENT: STATUSES
Lambda probe: Start-up_Lean_Rich_Fault due to rich value_Fault due to lean value
•
If the probe connector is removed (voltage almost equal to zero), the status is Fault due to
lean value.
Lambda check: Open loop/Closed loop/Rich in closed loop/Lean in closed loop/enriched
•
Closed loop indicates that the control unit is using the oxygen sensor signal to keep the
combustion as close as possible to the stoichiometric value.
DIAGNOSTICS INSTRUMENT: ACTIVATION
Lambda probe heating
•
The auxiliary injection relay (No. 46 in the wiring diagram, placed in the front relay box, left
side; CHECK, however, the identification of the relay with the colour of the cables) is ener-
gised and the heating circuit is closed to ground 5 times (pin 3 of the lambda probe
connector). The continuity of the wiring is necessary for correct activation: no error indica-
tions are displayed in case of lack of activation.
DIAGNOSTICS INSTRUMENT: ELECTRICAL ERRORS
Front lambda probe P0130
•
shorted to positive
Error cause
•
Excessive voltage (battery voltage) has been detected at PIN 10 and 22 of the ENGINE
connector. Caution: the 'Oxygen sensor' parameter is not the real value that is read; a re-
covery value is displayed instead. The instrument panel does not indicate the presence of
this error even in the ATT status.
Troubleshooting
•
shorted to positive: with key set to ON, disconnect the sensor connector and measure PIN
1 voltage on the cable harness side (grey cable): if there is voltage (5 or 12 V), restore the
cable harness; if there is not, replace the lambda probe.
Rear lambda probe P0136
ELE SYS - 196
Caponord 1200 - Caponord 1200 Rally
Advertisement
